Some standard content:
ICS71.100.40
Classification number: Y43
Registration number: 15121-2005
Light Industry Standard of the People's Republic of China
QB/T1913—2004
Replaces QB/T1913—1993
Transparent soap
Transparent soaps
Published on December 14, 2004
Implementation by National Development and Reform Commission of the People's Republic of China on June 1, 2005
This standard is a revision of QB/T1913-1993 "Translucent laundry soap". Compared with QB/T1913-1993, the main changes of this standard are as follows: the name of the standard has been revised, and the scope of the name has been expanded; the classification of products has been added;
the index of ethanol insoluble matter has been cancelled:
the index of water and volatile matter and the test method have been added; the transparency index and the transparency determination method have been revised: the foaming power index and the preparation of hardness water for determination have been revised; the formula for weighing the test portion for foaming power determination has been added; the quantitative packaging requirements have been tightened:
the sample preparation clause has been added:
the inspection rules have been revised;
no unified regulations have been made on the shelf life.
Appendix A and Appendix B of this standard are normative appendices. This standard is proposed by the China Light Industry Federation. This standard is under the jurisdiction of the National Surfactant Detergent Standardization Center. QB/T1913-2004
the drafting units of this standard are: National Detergent Quality Supervision and Inspection Center (Taiyuan), Nice Group Co., Ltd., and Hangzhou High-tech Automation Instrumentation Co., Ltd.
The main drafters of this standard: Liang Hongyan, Xu Youqi, Yan Fang, Zhao Jieji, Xu Yongqiang, Ding This standard was first issued on January 6, 1994, and this is the first revision. From the date of implementation, this standard replaces the light industry standard QB/T1913-1993 "Translucent Laundry Soap" issued by the former Ministry of Light Industry. 1 Scope
Transparent Soap
QB/T1913-2004
This standard specifies the product classification, requirements, test methods, inspection rules and marking, packaging, transportation and storage of transparent soap. This standard is applicable to transparent soap produced by rolling process and cooling molding process, including translucent laundry soap, transparent laundry soap, crystal soap and its colored products.
2 Normative References
The clauses in the following documents become the clauses of this standard through reference in this standard. For any dated referenced document, all subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, parties to an agreement based on this standard are encouraged to investigate whether the latest versions of these documents can be used. For any undated referenced document, the latest version applies to this standard. GB/T601-2002 Preparation of standard titration solutions for chemical reagents GB/T603-2002 Preparation of preparations and products used in test methods for chemical reagents GB/T7462-1994 Determination of foaming power of surfactants - Improved Ross-Miles method (negISO696:1975) GB/T15818-1995
Test method for biodegradability of anionic and nonionic surfactants (eqvJISK3363-1990) QB/T2485-2000
QB/ T2487-2000
Compound laundry soap
QB/T2623.1-2003
Test methods for soap-Determination of free caustic content in soap (ISO456:1973, MOD)QB/T2623.3-2003
Test methods for soap-Determination of total alkali and total fatty matter content in soap (ISO685:1975MOD)QB/T2623.4-2003
Test methods for soap-Determination of moisture and volatile matter content in soap-Oven method (ISO 672:1978,MOD)
QB/T2623.6-2003 Soap test method Determination of chloride content in soap Titration method (ISO457:1983,MOD) State Administration of Technical Supervision Order [1995 No. 43 Metrological Supervision Regulations for Quantitatively Packaged Goods State Administration of Technical Supervision Letter [1996] No. 053 Opinions on the implementation of the "Measurement Supervision Regulations for Quantitatively Packaged Goods" 3 Product classification
Transparent soap products are divided into the following two types:
Type 1: Transparent soap containing only fatty acid sodium and additives. Type II: Transparent soap containing fatty acid sodium and (or) other surfactants, functional additives, and additives. 4 Requirements
4.1 Raw material requirements
The biodegradability of various surfactants added to transparent soap should not be less than 90%. 4.2 Sensory index
4.2.1 Package appearance
The package is neat, straight and not skewed: the trademark, pattern and handwriting on the package should be clear. 4.2.2 Soap body appearance
The pattern and handwriting are clear, the soap shape is straight, the color is uniform, and there are no obvious impurities and stains. 4.2.3 Odor
QB/T1913-2004
No oil rancidity or
4.3 Physical and chemical properties
The physical and chemical properties of transparent soap should meet the requirements of Table 1. Table 1
Physical and chemical properties of transparent soap
Butyl sodium soap/%
Total effective matter/%
Water and volatile matter/%
Free caustic soda as NaOH
Chloride (as NaCI)/%
Transparency [(6.50±0.15)mm thick slice]/%Foaming power (5mm)/mL
4.4 Quantitative packaging
The net content of each piece of transparent soap shall be determined by the manufacturer during production (or packaging), and the net content shall comply with the State Technical Supervision Bureau's order [ 1995】Requirements of No. 43
5 Test method
Unless otherwise specified, only recognized analytical reagents and distilled water or deionized water or water of equivalent purity are used in the analysis. Sample preparation
0 weigh the mass of each soap and measure its average actual net content. First, use a scale with a scale value not less than
and then dry each piece in the middle
,
and cut three knives perpendicular to each other into eight parts. Take two diagonal parts and cut them into thin slices or break them, mix them thoroughly, and put them into a clean and sealed container
for later use.
5.2 Biodegradability of surfactants
Determine according to GB/
5.3 Sensory index
995.
5.3.1 Packaging and soap body appearance
Sensory self-test
5.3.2 Smell
Identify by smell.
5.4 Dry sodium soap or total effective matter
5.4.1 Type I transparent soap
5.4.1.1 Arbitration method
According to QB/T2623.3-2
2003, the reported result of the processed sodium soap (% shall be expressed as the arithmetic mean to the integer and converted according to formula (1).
Reported result (%)
5.4.1.2 Simplified method
Measured result × measured actual net content of soap Net content marked on the package
Converted according to QB/T2485
(1).
5.4.2 Type I transparent soap
QB/T1913-2004
2000 Appendix A. Reported result of dry sodium soap (% ) is expressed as the arithmetic mean to the integer, and the total effective matter content is determined according to 4.2 of QB/T2487-2000. The reported result of total effective matter (%) is expressed as the arithmetic mean to the integer, and is converted according to formula (1)
5.5 Moisture and volatile matter
According to the provisions of QB/2623.4-2003. The reported results of moisture and volatile matter (%) are expressed as the arithmetic mean to the integer, and are converted according to formula (2)
Measured result × measured actual net content of soap reported result (%) =
Net content marked on the package
Net content marked on the package - Actual net content of soap measured x 100
Net content marked on the package
5.6 Free caustic soda
** (2)
The report result of free caustic soda (%) shall be expressed as the arithmetic mean to two decimal places according to the provisions of QB/2623.1-2003 and converted according to formula (1).
5.7 Chloride
The report result of chloride (%) shall be expressed as the arithmetic mean to one decimal place according to the provisions of QB/T2623.6-2003. The report result of chloride (%) shall be expressed as the arithmetic mean to one decimal place according to formula (1).
5.8 Transparency
The report result shall be expressed as the arithmetic mean to one decimal place according to Appendix A. 5.9 Foaming power
According to the provisions of GB/T7462-1994, use 1.5mmol/L calcium hard water (prepared according to Appendix B) and calculate the mass of the test portion according to formula (3).
Test portion (g) Volume of sample solution to be prepared × 1.0% × Actual net content of soap measured Net content marked on the package
(3)
Dissolve the weighed test portion with hard water of the volume of sample solution to be prepared and stir well. This solution is equivalent to the 1% solution prepared by sampling on the production line.
Precision The absolute value of two independent test results obtained under repeatability conditions is not greater than 15mL, with the premise that the case of 15mL of large Ding is not more than 5%.
5.10 Quantitative packaging
The inspection of the net content of small-package transparent soap shall be carried out in accordance with the provisions of the State Administration of Technical Supervision's Technical Supervision Letter [19967053] (i.e. the production site shall be the sampling location), and the sampling method and judgment rules shall be carried out in accordance with the State Administration of Technical Supervision's Order 6 Inspection Rules
6.1 Inspection Classification
6.1.1 Type Inspection
19951 No. 43.
Type inspection items include all items in Chapter 4, but the biodegradability of surfactants may not be inspected if it is known. When the product encounters one of the following situations, type inspection should be carried out. a) During normal production, type inspection should be carried out regularly (generally once every three months): b) When there are major changes in raw materials, formulas, processes, production equipment, management, etc. (including changes in personnel quality) that may affect product quality:
QB/T1913-2004
When production is resumed after a long period of suspension
When the factory inspection results are significantly different from the previous type inspection results: d
eWhen the national industry management department and quality supervision agency propose a type inspection requirement. 6.1.2 Factory Inspection
The factory inspection items are the dry sodium soap or total effective matter content, free caustic soda, and transparency in 4.2, 4.4 and 4.3. 6.2 Product batching and sampling rules
6.2.1 Batch
Products are delivered and sampled in batches, and the same type, same specification, same batch number or same production date of the same delivery conditions are combined into a delivery batch.
Products delivered by the production unit shall first be inspected by its quality inspection department according to the adopted standards. They can only leave the factory if they meet the adopted standards and are issued with a product quality inspection certificate. The product quality inspection certificate shall include: the name and address of the producer, the product name, trademark, type, net content, the adopted standard number, batch number or production date, quality indicators, etc. The consignee shall accept the product based on the product quality inspection certificate or relevant contract. If necessary, it may conduct sampling acceptance or piece-by-piece inspection within one month in accordance with the following provisions.
6.2.2 Sampling
The samples required for acceptance and arbitration inspection by the consignee shall be determined according to the product batch size, in boxes (blocks), and the sample size shall be determined according to Table 2. The two parties shall jointly randomly select samples from the delivery batch at the delivery location. Table 2 Batch and sample size
Sample size
6.3 Sensory index inspection
6.3.1 Inspection of large packages
91~150
151~500
Draw box samples N according to the batch size in Table 2, and the inspection of large packages is carried out in accordance with Table 3. Table 3 Inspection of large packages
Defective items
Lack of proper packaging labels on the outside of the box
No quality certificate in the box
No production date or batch on the outside of the box
The packaging does not meet the bundling requirements
If one item meets the requirements, it is judged
The large package is unqualified
Qualified judgment rate (unqualified product rate), the value is expressed in %, calculated according to formula (4). Qualified determination rate (unqualified product rate) (%) = × 100N
Where:
n—the total number of unqualified boxes found in the total number of box samples, in boxes; N—the total number of box samples taken from the delivery batch, in boxes. 6.3.2 Inspection of small packages
Unit: box (piece)
501~1200
Qualified determination rate (unqualified product rate)
≤10%
（4）
Based on the box samples, according to the number of pieces in each box sample, block samples are drawn from each box according to Table 2, and the cumulative block samples are N. The small package inspection is carried out according to Table 4.
Defective items
The small package lacks the required packaging label
Contaminated, crooked packaging
The soap body is rough, the color is uneven, there are obvious impurities, there is rancidity or bad smell
Table 4 Inspection of small packages
If one item meets the requirements, it is judged
that the small package is unqualified
Qualified judgment rate (unqualified product rate), the value is expressed in %, calculated according to formula (5). Qualified judgment rate (unqualified product rate) (%) = × 100N2
n——The total number of unqualified products found in the total number of block samples, in blocks: N, the total number of block samples drawn from the delivery batch, in blocks. 6.4 Physical and chemical index inspection
QB/T1913—2004
Qualified judgment rate (unqualified product rate)
≤10%
（5）
Randomly select the same number of samples from each box of sample wood, so that the total number of samples is not less than 30, divide the block samples into three parts, store them in clean plastic bags, and seal them. The label should indicate the product name, trademark, type, batch number (or production date), sampling date, manufacturer name and signature of the sampler. The delivery parties each hold one copy for inspection, and the third copy is kept by the delivery party for arbitration inspection. The storage period shall not exceed one month.
6.5 Judgment rules
If the sensory index inspection fails, re-sampling can be carried out. If the re-inspection result is still unqualified, the batch of products shall be judged as unqualified. The physical and chemical index test results are rounded off by the rounded value comparison method and compared with the index to determine whether they are qualified or not. If one index is unqualified, samples can be taken from twice the number of boxes and the unqualified items can be re-tested. If the re-test results are still unqualified, the batch of products will be judged to be unqualified. 6.6 If the delivery parties cannot reach an agreement due to different test results, they can request arbitration inspection. The arbitration result shall be the final basis. 7 Marking, packaging, transportation, purchase and storage
7.1 Marking
The markings (patterns and texts) printed on large and small packages should be clear, without fading, and easy to identify. 7.1.1 Bulk Package Marking
The following markings should be placed on the bulk package of the product: a) Product name, trademark, standard number and type adopted (can be omitted if it is Type I transparent soap): Net content when packaged, number of pieces per box;
Gross weight of the box, box dimensions:
Production date or production batch number:
Necessary safe storage and transportation patterns or marks:
Producer's name, address and postal code. f)
7.1.2 Small package markings
The following markings should be on the small package of the product:
a) Product name, trademark, standard number and type (can be omitted if it is Type I transparent soap): b) Net content of the product when packaged:
QB/T1913-2004
Producer name
Address and postal code:
Marks added by the producer according to customer needs The body of the naked soap should have a trademark or product name. 7.1.3
7.2 Packaging
7.2.1 Requirements for large packaging
a) Products should be packed in corrugated boxes or hard plastic boxes. b) Products should be arranged neatly in the packaging, and there should be no missing products. The sealing should be tight and reliable: each packaging box should be accompanied by a product quality inspection certificate.
7.2.2 Requirements for small packaging
Small packaging of products should be sealed completely and properly. 7.3 Transportation
Products should be loaded and unloaded gently during transportation.
7.4 Storage
Avoid exposure to sunlight and rain. It is strictly forbidden to step on the boxes or stack heavy objects. Products should be stored in a ventilated, dry place that is not exposed to direct sunlight or rain. 8
Shelf life
The stacking height should be appropriate to avoid damage to the large packaging. Under the specified storage conditions, the product is stable for a long time and the shelf life and production date do not need to be marked: if the product can only be guaranteed to meet the requirements of this standard within one year, the shelf life and production date (or expiration date) should be marked. A.1 Principle
Appendix A
(Normative Appendix)
Determination of transparency
QB/T1913-2004
Under specified conditions, the difference between the intrinsic light reflection factor of the sample with white board lining and the light reflection factor with black backing is determined as a percentage of the intrinsic light reflection factor with white board lining
A.2 Terms and definitions
The following terms and definitions apply to this standard. A.2.1
Transparency
transparency
The difference between the intrinsic light reflection factor and the light reflection factor of the sample and the percentage of the intrinsic light reflection factor. A.2.2
ray reflect factor
ray reflect factor
The reflection of incident light when the sample has a black backing at a certain thickness. A.2.3
intrinsic ray rellect factor
intrinsic ray rellect factor The reflection of incident light when the sample is covered with a white plate at a certain thickness A.3 Instruments and equipment
A.3.1 Standard white plate
Preparation of standard white plate Use GSBA67001 "Magnesium Oxide Whiteness Physical Standard" or GSBA67006 "Sodium Sulfate Whiteness Physical Standard" and standard powder with data given by the national metrology and standard testing department. Use the sample press to press into a standard white plate within the validity period according to the steps specified in GBT9087 for calibrating instruments.
A.3.2 Working white plate
For the convenience of measurement, a white ceramic plate with a flat surface, no scratches or cracks can be used as a working white plate for daily measurement of whiteness. The working white plate should be calibrated with a standard white plate every month. The working white board should be placed in a desiccator and stored in a dark place. If it is contaminated, wipe it with flannel or absorbent cotton dipped in anhydrous alcohol.
Then place it in a drying oven at 105℃~110℃ for 30 minutes, take it out, place it in a desiccator and cool it to room temperature, and calibrate it with a standard white board: or handle it according to the regulations in the whiteness meter operating instructions. A.3.3 Requirements for autometers
Autometers that can measure the transparency of samples. The optical geometry of the instrument is diffuse/vertical (a/e) or vertical/diffuse (o/d): Instrument light source: The reading accuracy of the instrument is required to reach the decimal point: The stability of the instrument, after the power-on preheating, the reading drift is not greater than 0.5 every 30 minutes of the light source of the instrument. The accuracy of the instrument should meet the requirements of level 2 or above in the level 2 classification standard of the whiteness meter verification procedure. Note: DN-B type whiteness meter is applicable.
A.4 Test procedure
A.4.1 Preparation of test soap slices
QB/T1913-2004
Cut the sample into slices with a thickness of (6.50±0.15) mm and embed them in a pressing mold to prepare for measurement. A.4.2 Measurement
Turn on, preheat and adjust the instrument according to the instrument manual. Measure and record the R and R values of each test soap slice. Note: If the instrument is equipped with a microcomputer and a printer, the RR value and T value can be printed directly. A.4.3 Results and calculations
The transparency of transparent soap is T (%), expressed in %, and is calculated according to formula (A.1): T (%)-
Where:
Transparency of the sample, %:
Light reflection factor when the sample backing is black backing; Intrinsic light reflection factor when the sample backing is self-board backing A.4.4 Precision
The absolute difference between two independent determination results obtained under repeatability conditions shall not exceed 2%, provided that the difference shall not exceed 5% if it exceeds 2%.
B.1 Scope
Appendix B
(Normative Appendix)
Preparation and calibration of calcium hardness water
This appendix specifies the preparation method of water with known calcium hardness for surfactant and detergent testing. B.2 Definitions
The following definitions apply to this standard. wwW.bzxz.Net
Water hardness
refers to the properties of water due to the presence of calcium salts. B.3 Principle
QB/T1913-2004
Dissolve an appropriate amount of calcium chloride to prepare a stock solution, use chrome black T as an indicator, and use ethylenediaminetetraacetic acid disodium salt (EDTA) to determine the calcium content in the stock solution by complexometric titration.
Dilute the stock solution with an appropriate volume to prepare a dilute solution of the required hardness. B.4 Reagents
B.4.1 Anhydrous calcium chloride (CaCl) or calcium chloride dihydrate (CaCh2HO) or other hydrates. B.4.2 Ammonia-ammonium chloride buffer solution (A): pH ~ 10, prepared according to 4.1.3.3.1 of GB/T603-2002. B.4.3Z Disodium diaminetetraacetate (EDTA) (GB/T1401): c (EDTA) = 0.02 mol/L standard titration solution, prepared and calibrated according to 4.15 of GB/T601-2002
B.4.4 Chrome black T indicator solution: 5 g/L solution, prepared according to 4.1.4.24 of GB/T603-2002B.5 Instruments
B.5.1 Single-scale pipette: 25 mL.
B.5.2 Conical flask: 250 mL.
B.5.3 Burette with stopper: 50mL
B.5.4 Dark brown reagent bottle with ground glass stopper: 10LB.6 Preparation of 1.5mmol/L calcium hard water
B.6.1 Dissolve 16.65g of anhydrous calcium chloride (or 22.05g of calcium chloride dihydrate) in water, dilute to 10L, and place in a reagent bottle (B.5.4) as a storage solution.
B.6.2 Determination of calcium content in stock solution
Use a pipette (B.5.1) to draw 25 mL of the stock solution prepared in B.6.1, place it in a 250 mL conical flask (B.5.2), dilute it with 50 mL of distilled water, then add 10 mL of ammonia-ammonium chloride buffer solution (A) (B.4.2) and 5 drops of chrome black T indicator solution (B.4.4), then titrate with disodium ethylenediaminetetraacetic acid (EDTA) standard titration solution (B.4.3) until the solution changes from purple-red to pure blue, which is the end point. At the same time, make a blank test. The calcium content of the stock solution co, expressed in millimoles per liter (mmol/L), is calculated according to formula (B.1). 9
QB/T1913-2004
In the formula:
-)xcx1000=40x（-V)xc
The volume of EDTA standard titration solution consumed when titrating the sample, in milliliters (mL):
The volume of EDTA standard agreed solution consumed when titrating the blank, in milliliters (mL):
Preparation of water with known calcium hardness
The concentration of EDTA standard titration solution, in moles per liter (mol/L).
For a given volume of water with known calcium hardness, the required volume of stock solution, in milliliters (mL), is calculated according to formula (B.2). V. =
The volume of water with known calcium hardness to be prepared, in milliliters (m): The calcium content of the hard water to be prepared, in mmol/L The calcium content of the stock solution, in mmol/L. Select the volume of V to be equivalent to the capacity of the volumetric flask, and require that it is greater than 10mL and less than 50mL. (B.2)
Fill the burette (B.5.3) with the stock solution (B6), add the calculated amount of stock solution V from the burette to the single-scale volumetric flask with a capacity of K, and measure to 0.1mL. Dilute with water to the mark and mix. 103 Requirements for the autometer
Autometer capable of measuring the transparency of the sample. The optical geometry of the instrument is diffuse/vertical (a/e) or vertical/diffuse (o/d): Instrument light source: The reading accuracy of the instrument is required to reach the decimal point: The stability of the instrument, after the power-on preheating, the reading drift of the instrument light source is D
for every 30 minutes, is not greater than 0.5: The accuracy of the instrument shall meet the requirements of level 2 or above in the grading standard of the whiteness meter verification procedure. Note: DN-B type whiteness meter is applicable.
A.4 Test procedure
A.4.1 Preparation of test soap slices
QB/T1913-2004
Cut the sample into slices with a thickness of (6.50±0.15) mm and embed them in the pressing mold for measurement. A.4.2 Measurement
Turn on, preheat and adjust the instrument according to the instrument instruction manual. Determine and record the R and R values of each test soap piece. Note: If the instrument is equipped with a microcomputer and a printer, the RR value and T value can be printed out directly. A.4.3 Results and calculations
The transparency of transparent soap T (%), the value is expressed in %, and is calculated according to formula (A.1) T (%)-
Where:
Transparency of the sample, %:
Light reflection factor when the sample backing is black backing; Intrinsic light reflection factor when the sample backing is self-board backing A.4.4 Precision
The absolute difference between two independent measurement results obtained under repeatability conditions shall not exceed 2%, provided that the difference shall not exceed 5% in the case of being greater than 2%.
B.1 Scope
Appendix B
(Normative Appendix)
Preparation and calibration of calcium hardness water
This appendix specifies the preparation method of water with known calcium hardness for surfactant and detergent testing. B.2 Definitions
The following definitions apply to this standard.
Water hardness
refers to the property of water due to the presence of calcium salts. B.3 Principle
QB/T1913-2004
Dissolve an appropriate amount of calcium chloride to prepare a stock solution, and use chrome black T as an indicator to determine the calcium content in the stock solution by complexometric titration using ethylenediaminetetraacetic acid disodium salt (EDTA).
Dilute the stock solution with an appropriate volume to prepare a dilute solution of the required hardness. B.4 Reagents
B.4.1 Anhydrous calcium chloride (CaCl) or calcium chloride dihydrate (CaCh2HO) or other hydrates. B.4.2 Ammonia-ammonium chloride buffer solution (A): pH ~ 10, prepared according to 4.1.3.3.1 of GB/T603-2002. B.4.3Z Disodium diaminetetraacetate (EDTA) (GB/T1401): c (EDTA) = 0.02 mol/L standard titration solution, prepared and calibrated according to 4.15 of GB/T601-2002
B.4.4 Chrome black T indicator solution: 5 g/L solution, prepared according to 4.1.4.24 of GB/T603-2002B.5 Instruments
B.5.1 Single-scale pipette: 25 mL.
B.5.2 Conical flask: 250 mL.
B.5.3 Burette with stopper: 50mL
B.5.4 Dark brown reagent bottle with ground glass stopper: 10LB.6 Preparation of 1.5mmol/L calcium hard water
B.6.1 Dissolve 16.65g of anhydrous calcium chloride (or 22.05g of calcium chloride dihydrate) in water, dilute to 10L, and place in a reagent bottle (B.5.4) as a storage solution.
B.6.2 Determination of calcium content in stock solution
Use a pipette (B.5.1) to draw 25 mL of the stock solution prepared in B.6.1, place it in a 250 mL conical flask (B.5.2), dilute it with 50 mL of distilled water, then add 10 mL of ammonia-ammonium chloride buffer solution (A) (B.4.2) and 5 drops of chrome black T indicator solution (B.4.4), then titrate with disodium ethylenediaminetetraacetic acid (EDTA) standard titration solution (B.4.3) until the solution changes from purple-red to pure blue, which is the end point. At the same time, make a blank test. The calcium content of the stock solution co, expressed in millimoles per liter (mmol/L), is calculated according to formula (B.1). 9
QB/T1913-2004
In the formula:
-)xcx1000=40x（-V)xc
The volume of EDTA standard titration solution consumed when titrating the sample, in milliliters (mL):
The volume of EDTA standard agreed solution consumed when titrating the blank, in milliliters (mL):
Preparation of water with known calcium hardness
The concentration of EDTA standard titration solution, in moles per liter (mol/L).
For a given volume of water with known calcium hardness, the required volume of stock solution, in milliliters (mL), is calculated according to formula (B.2). V. =
The volume of water with known calcium hardness to be prepared, in milliliters (m): The calcium content of the hard water to be prepared, in mmol/L The calcium content of the stock solution, in mmol/L. Select the volume of V to be equivalent to the capacity of the volumetric flask, and require that it is greater than 10mL and less than 50mL. (B.2)
Fill the burette (B.5.3) with the stock solution (B6), add the calculated amount of stock solution V from the burette to the single-scale volumetric flask with a capacity of K, and measure to 0.1mL. Dilute with water to the mark and mix. 103 Requirements for the autometer
Autometer capable of measuring the transparency of the sample. The optical geometry of the instrument is diffuse/vertical (a/e) or vertical/diffuse (o/d): Instrument light source: The reading accuracy of the instrument is required to reach the decimal point: The stability of the instrument, after the power-on preheating, the reading drift of the instrument light source is D
for every 30 minutes, is not greater than 0.5: The accuracy of the instrument shall meet the requirements of level 2 or above in the grading standard of the whiteness meter verification procedure. Note: DN-B type whiteness meter is applicable.
A.4 Test procedure
A.4.1 Preparation of test soap slices
QB/T1913-2004
Cut the sample into slices with a thickness of (6.50±0.15) mm and embed them in the pressing mold for measurement. A.4.2 Measurement
Turn on, preheat and adjust the instrument according to the instrument instruction manual. Determine and record the R and R values of each test soap piece. Note: If the instrument is equipped with a microcomputer and a printer, the RR value and T value can be printed out directly. A.4.3 Results and calculations
The transparency of transparent soap T (%), the value is expressed in %, and is calculated according to formula (A.1) T (%)-
Where:
Transparency of the sample, %:
Light reflection factor when the sample backing is black backing; Intrinsic light reflection factor when the sample backing is self-board backing A.4.4 Precision
The absolute difference between two independent measurement results obtained under repeatability conditions shall not exceed 2%, provided that the difference shall not exceed 5% in the case of being greater than 2%.
B.1 Scope
Appendix B
(Normative Appendix)
Preparation and calibration of calcium hardness water
This appendix specifies the preparation method of water with known calcium hardness for surfactant and detergent testing. B.2 Definitions
The following definitions apply to this standard.
Water hardness
refers to the property of water due to the presence of calcium salts. B.3 Principle
QB/T1913-2004
Dissolve an appropriate amount of calcium chloride to prepare a stock solution, and use chrome black T as an indicator to determine the calcium content in the stock solution by complexometric titration using ethylenediaminetetraacetic acid disodium salt (EDTA).
Dilute the stock solution with an appropriate volume to prepare a dilute solution of the required hardness. B.4 Reagents
B.4.1 Anhydrous calcium chloride (CaCl) or calcium chloride dihydrate (CaCh2HO) or other hydrates. B.4.2 Ammonia-ammonium chloride buffer solution (A): pH ~ 10, prepared according to 4.1.3.3.1 of GB/T603-2002. B.4.3Z Disodium diaminetetraacetate (EDTA) (GB/T1401): c (EDTA) = 0.02 mol/L standard titration solution, prepared and calibrated according to 4.15 of GB/T601-2002
B.4.4 Chrome black T indicator solution: 5 g/L solution, prepared according to 4.1.4.24 of GB/T603-2002B.5 Instruments
B.5.1 Single-scale pipette: 25 mL.
B.5.2 Conical flask: 250 mL.
B.5.3 Burette with stopper: 50mL
B.5.4 Dark brown reagent bottle with ground glass stopper: 10LB.6 Preparation of 1.5mmol/L calcium hard water
B.6.1 Dissolve 16.65g of anhydrous calcium chloride (or 22.05g of calcium chloride dihydrate) in water, dilute to 10L, and place in a reagent bottle (B.5.4) as a storage solution.
B.6.2 Determination of calcium content in stock solution
Use a pipette (B.5.1) to draw 25 mL of the stock solution prepared in B.6.1, place it in a 250 mL conical flask (B.5.2), dilute it with 50 mL of distilled water, then add 10 mL of ammonia-ammonium chloride buffer solution (A) (B.4.2) and 5 drops of chrome black T indicator solution (B.4.4), then titrate with disodium ethylenediaminetetraacetic acid (EDTA) standard titration solution (B.4.3) until the solution changes from purple-red to pure blue, which is the end point. At the same time, make a blank test. The calcium content of the stock solution co, expressed in millimoles per liter (mmol/L), is calculated according to formula (B.1). 9
QB/T1913-2004
In the formula:
-)xcx1000=40x（-V)xc
The volume of EDTA standard titration solution consumed when titrating the sample, in milliliters (mL):
The volume of EDTA standard agreed solution consumed when titrating the blank, in milliliters (mL):
Preparation of water with known calcium hardness
The concentration of EDTA standard titration solution, in moles per liter (mol/L).
For a given volume of water with known calcium hardness, the required volume of stock solution, in milliliters (mL), is calculated according to formula (B.2). V. =
The volume of water with known calcium hardness to be prepared, in milliliters (m): The calcium content of the hard water to be prepared, in mmol/L The calcium content of the stock solution, in mmol/L. Select the volume of V to be equivalent to the capacity of the volumetric flask, and require that it is greater than 10mL and less than 50mL. (B.2)
Fill the burette (B.5.3) with the stock solution (B6), add the calculated amount of stock solution V from the burette to the single-scale volumetric flask with a capacity of K, and measure to 0.1mL. Dilute with water to the mark and mix. 102), add 50mL of steamed stuffing water to dilute, then add 10mL of ammonia-ammonium chloride buffer solution (A) (B.4.2) and 5 drops of chrome black T indicator solution (B.4.4), then titrate with disodium ethylenediaminetetraacetic acid (EDTA) standard titration solution (B.4.3) until the solution changes from purple-red to pure blue, which is the end point. At the same time, make a blank test. The calcium content of the stock solution co, expressed in millimoles per liter (mmol/L), is calculated according to formula (B.1). 9
QB/T1913-2004
In the formula:
-)xcx1000=40x（-V)xc
The volume of EDTA standard titration solution consumed when titrating the sample, in milliliters (mL):
The volume of EDTA standard agreed solution consumed when titrating the blank, in milliliters (mL):
Preparation of water with known calcium hardness
The concentration of EDTA standard titration solution, in moles per liter (mol/L).
For a given volume of water with known calcium hardness, the required volume of stock solution, in milliliters (mL), is calculated according to formula (B.2). V. =
The volume of water with known calcium hardness to be prepared, in milliliters (m): The calcium content of the hard water to be prepared, in mmol/L The calcium content of the stock solution, in mmol/L. Select the volume of V to be equivalent to the capacity of the volumetric flask, and require that it is greater than 10mL and less than 50mL. (B.2)
Fill the burette (B.5.3) with the stock solution (B6), add the calculated amount of stock solution V from the burette to the single-scale volumetric flask with a capacity of K, and measure to 0.1mL. Dilute with water to the mark and mix. 102), add 50mL of steamed stuffing water to dilute, then add 10mL of ammonia-ammonium chloride buffer solution (A) (B.4.2) and 5 drops of chrome black T indicator solution (B.4.4), then titrate with disodium ethylenediaminetetraacetic acid (EDTA) standard titration solution (B.4.3) until the solution changes from purple-red to pure blue, which is the end point. At the same time, make a blank test. The calcium content of the stock solution co, expressed in millimoles per liter (mmol/L), is calculated according to formula (B.1). 9
QB/T1913-2004
In the formula:
-)xcx1000=40x（-V)xc
The volume of EDTA standard titration solution consumed when titrating the sample, in milliliters (mL):
The volume of EDTA standard agreed solution consumed when titrating the blank, in milliliters (mL):
Preparation of water with known calcium hardness
The concentration of EDTA standard titration solution, in moles per liter (mol/L).
For a given volume of water with known calcium hardness, the required volume of stock solution, in milliliters (mL), is calculated according to formula (B.2). V. =
The volume of water with known calcium hardness to be prepared, in milliliters (m): The calcium content of the hard water to be prepared, in mmol/L The calcium content of the stock solution, in mmol/L. Select the volume of V to be equivalent to the capacity of the volumetric flask, and require that it is greater than 10mL and less than 50mL. (B.2)
Fill the burette (B.5.3) with the stock solution (B6), add the calculated amount of stock solution V from the burette to the single-scale volumetric flask with a capacity of K, and measure to 0.1mL. Dilute with water to the mark and mix. 10
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