Some standard content:
[CS 71.100.99
Classification number: X69
Registration number: 12514-2003
Light Industry Standard of the People's Republic of China
0B/T2592--2903
Itaconic acid
Itatonic aeid
Published on September 13, 2003
National Development and Reform Commission of the People's Republic of China Implemented on October 1, 2003
QB/T2592-20C3
Itaconic acid is a white solid crystal (powder) formed by deep fermentation of starch (or mechanical quality) with Aspergillus niger as the original material. Cononic acid and its biological additives are important chemical additives in latex, resin, high-strength rubber, papermaking, plastic, chemical red wood and other industries. They are used to study the standard of artificial wood resistance. This standard was proposed by the United Nations Light Industry Commission and the United Nations Food Standardization Administration. The drafting units of this standard are: Lak Tu Wu Cheng Industrial Co., Ltd. and Nanjing Huajin Niu Food Products Co., Ltd. The main drafters of this standard are: San Zhiguo, Shi Dianzu. Ling, Chen Jinming, Shi Yuanzhi, Shan Bingyou, Zhang Yianbu of this standard. 2592--2003
1 Scope
Itaconic acid
This standard specifies the requirements, test methods, inspection rules and signs of itaconic glue, packaging, transportation, storage and other aspects. Itaconic acid made from starch (and board material) and processed by microbial deep fermentation and processing is not applicable to this standard. 2 Normative reference documents
The documents listed below become the terms of this standard through reference. All documents that are based on this standard shall be used for subsequent reference. All revisions (excluding packaging errors) or revised versions are not applicable to this standard. However, all parties who have reached an agreement based on this standard are encouraged to use the latest versions of these documents for research. For any out-of-date referenced documents, the latest versions shall apply to this standard. GB/T 191 Packaging, storage and transportation standards B: 60[-2002 Chemical reagents - Temperature titration solution - Preparation GB/T 6022002 Chemical reagents - Preparation of miscellaneous materials for testing and determination of dissolution T603-2002 Test methods for chemical reagents - Preparation of preparations and products used T605 General method for determination of colorimetry of chemical reagents B/T 6692 General method for determination of colorimetry of chemical reagents (B/T 9735 General method for determination of colorimetry of chemical reagents CB/T 12808-191 Laboratory glassware with single-line suction pipe JJF 7070 Quantitative packaging product net content measurement rules National Quality Supervision and Administration Bureau [1995] No. 43 Regulations on the supervision of packaged goods 3. Chemical names, molecular formula, structural formula and relative molecular mass of products - Chemical name, taconic acid (taconic acid, taconic acid, taconic acid) Molecular formula: CH4-C-CH-CUOH Molecular weight: 130.09 (according to the international atomic weight in 1983) 4 Requirements 4.1 Appearance Acid
It is a white free product or powder, without visible foreign impurities. 50% liquid does not appear filtration method 4.2 Physical and chemical indicators
Should meet the requirements of the branch
Content: % (quantity distribution:
drop point,
: APTTA
Ten no loss: % (quality index
average brightness play, (volume distribution:
chemical substances,
micro-sodium in mg/kg
nature: in Fe+). ng/kg
Remaining elements (in Pb, Tg/kg
5 Test methods
165--169
Q/T 2592—2003
Except for the period of time stated in the North, in the analysis, the reagents that can be confirmed to be pure for analysis are as follows: the water used is grade 3 (including grade 3) in accordance with GB/6682! The water used is the new instrument for general experiments. 5. Appearance
5.1.1 Observation
Collect the test details: After filtering, observe its color, check its foreign matter, and make good records. 5.1.2 Water-soluble
Collect the sample in 1.25 boxes, T50mL colorimetric micro-medium, add 25mL water solution, check if it is deep, you can record it, 5.2 Contains visible light (number method)
5.2.1 Principle
Identify the appearance of the needle in acidic medium! The released iodine reacts with itaconic acid to react with itaconic acid, and the mixture is mixed with iodine to reduce the iodine group. Then, the iodine is dissolved with sodium iodide standard solution to calculate the content of itaconic acid in the sample. 5.2.2 Test solution 5.2.2.1 Salt solution Add 11 volumes of concentrated hydrochloric acid to each volume. 5.2.2.2 Scaling solution (300 g/L) Weigh 30 g of sodium iodide: 100 mL of water: 500 mL of water. 2.2.3 Hot acid solution (c = KB0, J = 0.1 mal/l) Weigh 6.0 g of zinc sulfate and 1.70 g of potassium hydroxide, dissolve in water to make up to 500 mL, and add sodium sulfate standard solution (NaSO :) = 0.1mol/L) Prepare according to 4.6 of GB/T601202. 5.2.2.5 Mud powder indicator liquid (10g/1.) Prepare according to 4.1.4.20 of GB/T602-2002. 5.23 Accumulated
Graduated pipette 1mL, Sm, 10ml.
Single scale pipette 25ml., Gn/T1280B-1991-A 250mL.
Flow rate 50aL.
5. 2. 3. 5 points
QB/T2592-2003
5. 2. 4 Analysis steps: Weigh 0.1g of the test sample and make sure it reaches 0.2mg: add 25.0ml of the sodium thiocyanate solution (5.2.2.3) to 250ml of the solution. Immediately add the hydrochloric acid solution (5.2.2.1) 10ml, cover the bottle immediately, seal the bottle mouth with water, gently shake, and place it in a place for 1h. Take the cold part of the concentrated water, gently shake the bottle, add 3.5mL of potassium thiocyanate solution (5.22.2) to the bottle, gently shake, and do not let the air in the bottle stagnate. After 1min, add 0.1mol/L standard sulfuric acid solution ( 5.2.2.4) titrate the sample, when it is close to the end point (the filtered liquid turns yellow), add starch indicator (5.2.2.5) 1m, the end point is the end point, record the standard product of the standard titration! (. Perform the standard white test on the same piece, record the volume of sodium sulfate consumed by the standard filter!! ! ! Note: For the 152 tons of storage, the room should be lowered to 152, and it needs to be raised by 1.5 to ensure completeness. 5.2.5 Result Calculation
5.2.5.1 The content of clothing is calculated based on the most dispersed content, and the value is expressed in %, according to formula 11) The average juice content is X (%) - (-)/1000×0×65.05×100-(-3)×2×0.064 05XJ
65 o5-
When testing in air, the volume of sulfur-containing standard titration solution consumed, mL; when adding sample, the volume of sulfur-containing standard titration solution consumed, mL: Accurate water content of sodium sulfide standard titration solution, m: The mass of itaconic acid, /awt:
Sample mass, multiple
The calculated result is displayed to one decimal point, and the technical average value is the test result. 5.2.5.2 Allowable difference
, the absolute difference between the results of two tests of the sample shall not exceed 0.12% of the technical average. 5.3 Melting Point
5.3.1 Principle
Heat the melting point tube to determine the melting point range of the sample. 5.8.2 Instrument
Melting point determination instrument such as WRS-A or other instrument with equivalent analytical effect and high precision. 5.3.3 Analytical Steps
Powder the sample with a rubber rod. Take a capillary tube with one end matching the hot water heater, put the sample tightly into the capillary tube about 3mm from the bottom, and place it in the hot water heater for 20min-30min. After the sample is calibrated, operate it according to the instrument manual, and measure the melting point. When the sample shows the most obvious partial melting, it is the melting temperature. When the sample is completely melted, the temperature is the final melting temperature. Record the melting temperature (%) and melting temperature (%). 5.3.4 Final expression
Expressed in Celsius temperature (), initial temperature () - melting temperature () 5.4 Color
5.4.1 First method spectrophotometry
5.4.1.1 Instrument
UV spectrophotometer was used at 360 nm:
5.4.1.2 Analysis steps
Weigh 5g of sample: Make sure to 0.0g: Dissolve in water and add 100mL, mix thoroughly, and measure the absorbance (A) at a wavelength of 360nm with water as a reference. 5.4.1.3 Result calculation
The color is expressed as APHA and calculated according to formula [2>, where
color is expressed as APHA=100×A
-50g/L test wavelength. Calculation result table water blank integer
5.4.2 Second method Visual ratio methodwww.bzxz.net
Measure according to GB/605 method.
5.5 Loss on drying
5.5.1 Instrument
5.5.1.1 Low-weight body diameter × heat source (35mm×25u). 5.5.1.2 The desiccant is color-changing silica gel. 5.5.1.3 Decomposition temperature 0.1tng:
5.5.1.4 Electric heating constant temperature box (103±2)℃QA/T 2592--2C03
5.5.2 Analysis steps
Use the plant to weigh 2g of the test substance, with an accuracy of 0.5, put it into the drying box with a temperature of <103±2)℃, remove the cover, and place it on its side, under the heat for 2h, add, take out, and place in a dry place, cool to room temperature (about 30min), weigh the mother, 5. 5. 3 Calculation of results 5.5.3.11 Loss on drying is calculated as %, and the value is expressed in %, calculated according to formula (3), x (%) = 8: 10 ... t.3 Analysis: 0.1 rmg 5.6.1.4 Temperature furnace
5.6.2 Analysis steps
Burn at (650 ± 50) to constant weight, weigh or take 3g: Heat in electric furnace with light and wind at 0.2m, completely eliminate white powder, move to variable temperature container, heat at (650 + 50) for 2h, take out, cool to below 200, cool in deep container to room temperature, weigh.
5.5. 3 Calculation of results 5.6.3.1 The residual on ignition temperature is expressed as X, and the residual on ignition temperature is expressed as %, which is calculated according to formula (4). X%) = -m2 - x100 QB/T2592-2003 or in Chinese: m2 The residual on ignition temperature is expressed as X, and the residual on ignition temperature is expressed as %. The residual on ignition temperature is expressed as % and is calculated according to formula (4). X%) = -m2 - x100 QB/T2592-2003 or in Chinese: m2 The residual on ignition temperature is expressed as X, and the residual on ignition temperature is expressed as % ... Principle
In the limiting medium, the residual silver chloride is separated and becomes difficult to dissolve. When the oxygen content is high, the silver nitride will be dissolved in the solution. It can be determined by visual comparison method. 5.7.2 Reagents and solutions
5.7.2.11 Change the concentrated nitric acid solution (2mm1.4) to 47.7mL, dilute it to 250mL with water: 5.2.2 nitric acid solution (0.1mol/) weigh 4.25 silver nitrate, dissolve it with water, store it in brown reagent box for 250m.
5.7.2.3 Chemical solution: 0.1mg/mLC) GB/T602-2002 = length 1 serial number 30 manufacturer: 5.7.2.4 Chemical standard storage tank 5.0m deep (0.005m/mC1) absorbent standard storage tank 5.0m, dilute to 10-0 mL:
5.7.3 Analysis steps
5.1.3.1 Weigh 1g of sample: 0.01g: Place in a 5ml tube (H), add water to dilute to 25ml, mix with a spoon and pipette 5.0mL of 0.0051mx/ml oxide standard solution (5.7.2.4) into a tube (A), dilute with water ≤25mL: 5.7.3.2 Add 2mol/acid solution (5.7.2.115) to each tube, and immediately add 0.1mol/.acid 5.7.2.2: 1.0 mL of silver solution, mix with a spoon, place in a pre-light place for 2 minutes. 5.7.3.3 Take out the solution and perform horizontal H measurement. The test tube should not be used for the standard (i.e. emulsion content is 25 mg/kg). 5.8 Sulfate 5.8.1 Principle In an acidic medium, the sulfate ion is separated from the sulfate ion to form a standard solution. When the sulfate ion content is low, it "floats" between the sulfate ions and the mixture, making the mixture mixed. The H resistance test can be performed by the H resistance test. 5.8.2 Reagents and solutions
5.8.2.1 Hot solution: 10%) Take 24 mL of sodium chloride and dilute with water to 1 mL. 5.8.2.2 Sodium chloride (120 g/mL) Weigh 12 g of sodium chloride and dehydrate to 10 mL. 5.8.2.3 Standard sodium chloride solution (0.1 mg/mL) Prepare according to the method of No. 28 in Table 1 of QB/T602-2002. 5.B.3 Analytical procedures
5.3.1 3 g of sample, dilute to 0.0 1g, 50ml colorimetric tube (B), add water to float and dilute to 25mL, filter. At the same time, aspirate 0.1mmL sulfate standard pool 5.8.2.3) 1.mT. white tube (A), dilute with water to 25mlL.5.8.3.2 Add 10% acid solution (5.8.2.1) 1mL to each of the above tubes, place them in a 30C-~35 permanent bath for 1Umin, add 120g/T. oxide lock solution (5.8.2.2) 10mL, mix, and place in a water bath at low temperature for 10min. 5.8.3.3 Take out and compare visually: if the content of the test tube (B) does not exceed that of the standard tube (4), it is judged that the sulfate content is above 10 nmg/kg (i.e., the total content is 0.10 nmg/kg).
5.9.1 Principle
In a non-alkaline medium, iron ions react with ammonium sulfate to produce blood-red isocyanate. The color depth is compared with the rate of increase in the skin, and other measurements can be made.
5.9.2 Reagents and solutions
5.9.2.1 5.9.2.2 Potentiometric acid solution (24%) Take 154mL of concentrated hydrochloric acid and add water to make up to 25mL. QE/T2592-2003 5.9.2.3 Ammonium persulfate solution (10g/L) Take 2.5g of ammonium persulfate [(NH)S20g] and dissolve it with water and dilute it to 250mL. 5.9.2.4 Vegetable acid solution (B0g/L) Take or grind it to 20%, add water to dissolve it and dilute it to 2501mL. 5.9.2.5 Rapid standard preparation solution (0.1mg/mL Fe*) Prepare according to Table No. 55 in GB/T602-2002. 5.9.2.6 Titanium standard rapid decomposition solution (0.01mg/ml. Fe*) Take 0.1mg/mL Fe* 5.9.3.1 Weigh the sample 1 to 0.01g, place it in a 50u colorimetric tube (B), heat and dilute to 25mL, mix well. At the same time, take 1.0mL of 0.01mg/uL sodium hydroxide solution (5.9.2.6) and dilute to 25mL. 5.9.3.2 Add 3mL of 24% sodium hydroxide solution (5.9.2.2), 3mL of 10g/L supernatant (5.9.2.3) and 3mL of 80g/L amino acid solution (5.9.2.4) to the above tubes respectively, add 2mL of ethanol (5.9.2.1), and then let stand for stratification. 5.9.3.3 Colorimetric comparison: The color of the standard tube (B) is not darker than that of the standard tube (A). The iron content is judged to be qualified (the previous iron content is more than 10g/kg). 5.10 Heavy metals
5.1D.1 The first method is ammonium thioether method
6.10.1.1 Principle
In a volatile medium, heavy metal ions and negative divalent ions are resistant to high-color magnetic precipitation: the metal element content is relatively high, and the total suspension is a certain color, which can be used for standard negative determination. 5.10.1.2 Reagent solutions
5.10.1.2.1 Sodium hydroxide mixed solution Weigh 3.6 g of sodium hydride: add 30 mL of water and 120 mL of sodium hydroxide: the total volume is 240 mL
5.10.1.2.2 Ammonium hydroxide solution (40 g/L) Weigh 11.2 g of ammonium hydroxide CITCSNI and hydrolyze to 25 mL.
5.10.1.2.3 Hydrochloric acid solution (7 mal/L) Heat and adjust to 65.5 mL, add 29.5 mL of water 5.10.1.2.4 Make a buffer solution ( pH = 3.5) Weigh 2.5g of acetic acid and 62.5ml of non-wood, add 95mL of 7mol/L benzoic acid solution (5.10.1.3.3), adjust pH to 3.5 with 2mol/L hydrochloric acid or 1.5mol/L hydrogen water, and then use water to dilute 2501mL of 5.10.1.2.5 standard solution (0.1mg/ml Pb*) GB/T602-20U2-Table 1 No. 82. 5.10.1.2.6 Add 0.1mg/ml standard solution (0.01g/Hb*) to 10 times the standard solution, 5.10.1. 3 Analysis Steps
5.10.1.3.1 In two 50mL colorimetric tubes (AB), add 1ml of 40/1.5% acetic acid solution (5.10.1.2.2) and 5ml of ethanol-naphthalene hydroxide solution (5.10.1.2.1), respectively. Heat in a boiling water bath for 20min. Cool and use immediately. 5.10.1.3.2 In the colorimetric tube (B), add pH 3.5 anti- / ammonium-acid buffer (5.10.1.2.4) 5mL, then add 1g of the sample accurately weighed (especially accurate to 0.01g) with 25mL of water solution, and mix well. 5.10.1.3.3 In the large colorimetric tube (A, add 3.5% beryllium acetate-salt grade 7 solution (.5.10.1.2.4) 5mL and 0.01mg/ml valence standard to make the color full (5.10.1.2.6) 3.011, add water to 25ml, place for 2mm, and compare the color: if the color of the sample tube (B) is not less than that of the standard tube (A), the metal content is qualified (i.e., the result is ≤30mg/kg).
5.10.2 Second method: Hydrogen peroxide method
Method OB/T9735 method determination
6 Inspection rules
6. 1. The output is determined by the production situation (11~5t is a batch), and the sampling is carried out by batch. D
QB/T25922003
6.2 Each batch of products shall be inspected by the inspection department of the production enterprise before leaving the factory, and there shall be a product quality certificate. 6.3 Sampling method
6.3.1 The sampling period is 1---50
21 ~ 5u0
6.3.2 Take samples from the column (let or clear), insert each person with a sampler, and insert it into 3/4 of the (or bag): the maximum number of samples is 250, and the sample is mixed quickly. Take a total of no less than 100 samples from each product. If the sample is less than 100, take a sample from each package (or press). 6.3.3 Divide the net sample of the oil filter into two parts, seal it, and paste a label on it. Indicate the product name, manufacturer's name and address, column number, sampling location, and name of the sampler on the label. One copy will be sent to the chemical indicator for inspection, and one copy will be stored with the guarantee agent for production. 6.4 If there is any "change" in the inspection results (or more than [items]) If the product is not qualified, the detailed product in the batch record should be double-checked for re-testing. The re-testing result is used as the basis: If one item of the re-testing result is unqualified: the batch of products is judged as unqualified. 7 Marking, packaging, transportation, storage
7.1 The outer packaging of the product shall indicate: production year, address, product specifications, manufacturer, production date, batch, operation effect, standard number and level. If necessary, it can be used with instructions. 7.2 The packaging storage and transportation diagrams shall comply with the provisions of 6/191. 7.3 This product shall be packaged in a multi-layer inner and outer plastic packaging bag (or kraft paper composite). 14 Net content National Quality and Technical Supervision-[1995] No. 43 JJF1070 Implementation 7.5 This product shall not contain any harmful, odorous, pollutant or colored carbon dust during handling.
7.6 This product shall not be stored in warehouses that are in good condition, such as in the warehouse of the factory, and shall not be stored in a large amount.
A.1 Specification
(Informative Appendix)
Rapid determination of itaconic acid by neutralization method
QB/T 2592—2003
This method is suitable for monitoring or secondary determination of itaconic acid content in the production process. However, the finished product is subject to the secondary method. 4.2 Principle of the method
Use phenol as an indicator and slowly add sodium hydroxide solution for acid neutralization determination: A.3 Reagents and solutions
4.3.1 Sodium hydroxide standard titration solution C (aOH) = 0.1mbl/Technical GB601-2002 4.1 Preparation and standardization. 4.3.2 Acid test indicator solution (102/L) should be prepared according to 4.1.4.22 of 0R/T603-2002: A.4 Analysis steps: Take 0.2 mg of sample, accurate to 0.2 mg, dissolve in about 50 mL of water, add 250 μl of indicator solution, titrate with sodium hydride standard solution until it turns slightly blue, and keep 305°C as the end point. Record the volume of sodium hydride standard solution secreted (). At the same time, perform a blank test and record the volume of sodium hydride standard solution secreted (). A.5 Calculation of results
A.5.1 The card content of the clothing case is calculated by these fractions, and the value is expressed in %, and the formula (A.1) is: (5-15)*0.06505×100
%=—5-5）/10××65.05x100（
..... (A.1)
In the titration test, the estimated mass of the standard sodium hydroxide solution is mE: V2-* During the test, the volume of the standard sodium hydroxide solution is mI: mE: The accurate mass of the standard titration solution is m1/L65.05
mol/L. The calculated result is expressed as the minimum effective point. The arithmetic mean is taken as the test result. A.5.2 Allowable difference
The difference in the test results of the same sample twice shall not exceed 0.125 of the academic average value. 84 After placing for 2mm, color comparison is performed: if the color of the sample (B) is not less than that of the standard tube (A), the metal content is judged to be qualified (i.e., the result is ≤30mg/kg).
5.10.2 Method 2 Hydrogen Sulfate Method
Method OB/T9735 Method for Determination
6 Inspection Rules
6.1 The output is determined by the production situation (11~5t is a batch), and the batches are collected. D
QB/T25922003
6.2 Each batch of products shall be inspected by the inspection department of the production enterprise before leaving the factory, and shall be accompanied by a product quality certificate. 6.3 Sampling method
6.3.1 Dig out the length of 2 provisions
1---50
21 ~ 5u0
6.3.2 From the column cloud (let or clear), use the sampling allowance to insert each person, (or bag) 3/4: maximum 250 samples, quickly mix, take no less than a few of each product! , less than the old one from each package (or press) appropriate "Shenzhen". 6.3.3 Take the oil filter sample in two parts, seal it: paste a label, and indicate the product name, manufacturer's name and address, column number, sampling location, and sampler's name on the label. "Send one copy to the chemical laboratory for testing, and keep one copy with the manufacturer for production. 6.4 If the inspection result shows that there are some (or more) items that are not qualified, the detailed products in the batch of product records shall be double-checked for re-inspection and the re-inspection result shall be used as the basis: If there is one item that is not qualified in the re-registration result: the batch of products shall be judged as unqualified. 7 Marking, packaging, transportation, storage
7.1 The outer packaging of the product shall indicate: the year of production, address, product specifications, manufacturer, production date, batch, operation effect, and the standard number and level used. If it is necessary to pay, it can be used in addition. 7.2 The packaging, storage and transportation diagrams and signs shall comply with the provisions of 6/191. 7.3 This product shall be packed in a multi-layer inner and plastic (or kraft paper composite) outer packaging bag. 14 Net content National Quality and Technical Supervision-[1995] No. 43 JJF1070 Implementation 7.5 This product should not be used during the processing, and should not contain any harmful, odorous, pollutant, or colored carbonaceous substances.
7.6 This product should not be stored in a clean, hygienic, or dirty warehouse. r
A.1 Specification
(Informative Appendix)
Rapid determination of itaconic acid by neutralization method
QB/T 2592—2003
This method is suitable for monitoring or secondary determination of itaconic acid content in the production process. However, the finished product is subject to the supply method as the secondary method. 4.2 Principle of the method: Use phenol as the indicator and sodium hydroxide solution for acid neutralization and alcohol determination. A.3 Reagents and solutions: 4.3.1 Standard titration solution of sodium hydride C(AOH) = 0.1mbl/Prepare as specified in 4.1 of GB6012002. 4.3.2 Acid test indicator solution (102/L) should be prepared according to 4.1.4.22 of 0R/T603-2002: A.4 Analysis steps: Take 0.2 mg of sample, accurate to 0.2 mg, dissolve in about 50 mL of water, add 250 μl of indicator solution, titrate with sodium hydride standard solution until it turns slightly blue, and keep 305°C as the end point. Record the volume of sodium hydride standard solution secreted (). At the same time, perform a blank test and record the volume of sodium hydride standard solution secreted (). A.5 Calculation of results
A.5.1 The card content of the clothing case is calculated by these fractions, and the value is expressed in %, and the formula (A.1) is: (5-15)*0.06505×100
%=—5-5）/10××65.05x100（
..... (A.1)
In the titration test, the estimated mass of the standard sodium hydroxide solution is mE: V2-* During the test, the volume of the standard sodium hydroxide solution is mI: mE: The accurate mass of the standard titration solution is m1/L65.05
mol/L. The calculated result is expressed as the minimum effective point. The arithmetic mean is taken as the test result. A.5.2 Allowable difference
The difference in the test results of the same sample twice shall not exceed 0.125 of the academic average value. 84 After placing for 2mm, color comparison is performed: if the color of the sample (B) is not less than that of the standard tube (A), the metal content is judged to be qualified (i.e., the result is ≤30mg/kg).
5.10.2 Method 2 Hydrogen Sulfate Method
Method OB/T9735 Method for Determination
6 Inspection Rules
6.1 The output is determined by the production situation (11~5t is a batch), and the batches are collected. D
QB/T25922003
6.2 Each batch of products shall be inspected by the inspection department of the production enterprise before leaving the factory, and shall be accompanied by a product quality certificate. 6.3 Sampling method
6.3.1 Dig out the length of 2 provisions
1---50
21 ~ 5u0
6.3.2 From the column cloud (let or clear), use the sampling allowance to insert each person, (or bag) 3/4: maximum 250 samples, quickly mix, take no less than a few of each product! , less than the old one from each package (or press) appropriate "Shenzhen". 6.3.3 Take the oil filter sample in two parts, seal it: paste a label, and indicate the product name, manufacturer's name and address, column number, sampling location, and sampler's name on the label. "Send one copy to the chemical laboratory for testing, and keep one copy with the manufacturer for production. 6.4 If the inspection result shows that there are some (or more) items that are not qualified, the detailed products in the batch of product records shall be double-checked for re-inspection and the re-inspection result shall be used as the basis: If there is one item that is not qualified in the re-registration result: the batch of products shall be judged as unqualified. 7 Marking, packaging, transportation, storage
7.1 The outer packaging of the product shall indicate: the year of production, address, product specifications, manufacturer, production date, batch, operation effect, and the standard number and level used. If it is necessary to pay, it can be used in addition. 7.2 The packaging, storage and transportation diagrams and signs shall comply with the provisions of 6/191. 7.3 This product shall be packed in a multi-layer inner and plastic (or kraft paper composite) outer packaging bag. 14 Net content National Quality and Technical Supervision-[1995] No. 43 JJF1070 Implementation 7.5 This product should not be used during the processing, and should not contain any harmful, odorous, pollutant, or colored carbonaceous substances.
7.6 This product should not be stored in a clean, hygienic, or dirty warehouse. r
A.1 Specification
(Informative Appendix)
Rapid determination of itaconic acid by neutralization method
QB/T 2592—2003
This method is suitable for monitoring or secondary determination of itaconic acid content in the production process. However, the finished product is subject to the supply method as the secondary method. 4.2 Principle of the method: Use phenol as the indicator and sodium hydroxide solution for acid neutralization and alcohol determination. A.3 Reagents and solutions: 4.3.1 Standard titration solution of sodium hydride C(AOH) = 0.1mbl/Prepare as specified in 4.1 of GB6012002. 4.3.2 Acid test indicator solution (102/L) should be prepared according to 4.1.4.22 of 0R/T603-2002: A.4 Analysis steps: Take 0.2 mg of sample, accurate to 0.2 mg, dissolve in about 50 mL of water, add 250 μl of indicator solution, titrate with sodium hydride standard solution until it turns slightly blue, and keep 305°C as the end point. Record the volume of sodium hydride standard solution secreted (). At the same time, perform a blank test and record the volume of sodium hydride standard solution secreted (). A.5 Calculation of results
A.5.1 The card content of the clothing case is calculated by these fractions, and the value is expressed in %, and the formula (A.1) is: (5-15)*0.06505×100
%=—5-5）/10××65.05x100（
..... (A.1)
In the titration test, the estimated mass of the standard sodium hydroxide solution is mE: V2-* During the test, the volume of the standard sodium hydroxide solution is mI: mE: The accurate mass of the standard titration solution is m1/L65.05
mol/L. The calculated result is expressed as the minimum effective point. The arithmetic mean is taken as the test result. A.5.2 Allowable difference
The difference in the test results of the same sample twice shall not exceed 0.125 of the academic average value. 8
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