HG/T 2430-1993 Water treatment agent scale inhibitor and corrosion inhibitor Ⅱ
Some standard content:
Chemical Industry Standard of the People's Republic of China
Water Treatment Agent
Subject Content and Scope of Application
Scaling and Corrosion Inhibitor
HG/T 2430--- 93
This standard specifies the scope of application, technical requirements, test methods, inspection rules, marking, packaging, transportation, storage and safety requirements of scale and corrosion inhibitor products.
This standard applies to all-organic scale and corrosion inhibitor II that does not contain heavy metals and sulfonates and is compounded with acrylic acid-acrylic acid ester copolymer and hydroxyethyl diphosphonic acid as the main components. This product is mainly used as a scale and corrosion inhibitor in open-type circulating cooling water systems. 2 Reference Standards
GB 191
Packaging, storage and transportation pictorial symbols
Preparation of standard solutions for titration analysis (volume analysis) of chemical reagents Preparation of preparations and products used in chemical reagent test methods CB603
(B1250 Methods for expressing and determining limit values GB6682 Specifications and test methods for water used in analytical laboratories 3 Technical requirements
3.1 Appearance: colorless or light yellow transparent liquid. 3.2 Scale and corrosion inhibitors should meet the requirements of Capsule 1. Table 1
Content of phosphonate (in PO4), %
Content of phosphorous acid (in PO4, %
Content of solids, %
Density·g/cm
pH (original solution)
4 Test methods
First-class apparatus||tt ||8.00±0.50
1.10~~1.18
Qualified products
8.00±1.00
1.10~1.25
The reagents and water used in this standard, unless otherwise specified, are analytically pure reagents and grade 3 water in accordance with GB6682.
The standard solutions and preparations required in the test are prepared in accordance with the provisions of GB601 and GB603 unless otherwise specified. 4.1 Determination of phosphonate content by photometric method
4.1.1 Summary of the method
Approved by the Ministry of Chemical Industry of the People's Republic of China on April 22, 1993 132
Implemented on January 1, 1994
HG/T2430—93|| tt||In an acidic medium, phosphonates and phosphorous acid are converted into orthophosphoric acid with ammonium persulfate under heating conditions. Antimony phosphate complex is generated by the reaction of ammonium molybdate and phosphoric acid, and ascorbic acid is used to reduce it to "antimony phosphomolybdenum blue". The total phosphate content (in terms of PO-) is determined by absorptiometry, and then the phosphate (in terms of PO-) and phosphorous acid (in terms of PO-) contents are subtracted to calculate the phosphonate content. 4.1.2 Reagents and materials
4.1.2.1 Phosphate standard preparation solution: 1 mL of solution contains 0.500 mg P0~. Weigh 0.7165 g of potassium dihydrogen phosphate (GB1274) that has been dried to constant weight at 100C~105℃ in advance, accurate to 0.0002 g. Place in a beaker, add water to dissolve, transfer to a 1000 mL volumetric flask and dilute with water to Scale, shake hook:
4.1.2.2 Phosphate standard solution: 1mL solution contains 0.020mg PO~; Pipette 20.00mL. Phosphate standard stock solution (4.1.2.1) into a 500ml. volumetric flask, dilute to scale with water, and shake well; 4.1.2.3 Ammonium molybdate solution: weigh 6.0g ammonium molybdate (GB657) and dissolve in about 500mL. water, add 0.2g potassium antimony tartrate and 83mlL concentrated sulfuric acid (GB625), dilute to 1L after cooling, fill well, store in a brown bottle, storage period 6 months 4.1.2.4 Ascorbic acid solution: weigh 17.6g ascorbic acid and dissolve in appropriate amount of water, add 0.2g disodium ethylenediaminetetraacetic acid (GB1401) and 8ml formic acid, dilute to 1L with water, mix well. Store in a brown bottle. Storage period: 15 days; 4.1.2.5 Sulfuric acid (GB 625): c(H2SO4) 0.5 mol/L; 4.1.2.6 Ammonium persulfate (GB656): 24 g/1. Solution, storage period: 7 days. 4.1.3 Instruments and equipment
General laboratory instruments and
4.1.3.1 Spectrophotometer, wavelength range 400~800 mm, 4.1.3.2 Adjustable electric furnace, 800 W.
4.1.4 Analysis steps
4.1.4.1 Test materials
a. Preparation of sample solution: Weigh about 1.5 g of sample, accurate to 0.0002 g+, place in a 500 mL volumetric flask, dilute to the mark with water, and shake well. This solution is used to determine the orthophosphate content. 1. Pipette 10.00ml of the above solution into a 500mL volumetric flask, dilute to the mark with water, and shake. This solution is used to determine the total phosphate content.
4.1.4.2 Determination of orthophosphate content
Pipette 20.00ml of the sample solution (4.1.4.a) into a 50mL volumetric flask (or colorimetric tube), add 20mL of water, then add 5mL of ammonium molybdate solution (4.1.2.3) and 3ml of ascorbic acid solution (4.1.2.4), dilute to the mark with water, and shake. Place at 25℃~30℃ for 10min. Measure the absorbance at 710nm using a 1cm cuvette with the reagent blank as reference. 4.7.4.3 Determination of total phosphate content
Pipette 20.00ml of the test solution (4.1.4.b) into a 100mL flask and add 1m. Sulfur solution (4.1.2.5) and 5mL ammonium persulfate solution (4.1.2.6) are heated to boiling on an adjustable electric stove (4.1.3.2) and kept for 10-15 minutes (so that the volume of the solution is half of the original volume). Remove, cool to room temperature, and transfer to a 50mL volumetric flask (or colorimetric tube). Add 5mL ammonium persulfate solution and 3mL ascorbic acid solution, dilute to the mark with water, and shake. Place at 25°C to 30°C for 10 minutes, and measure its absorbance at 710nm using a 1cm colorimetric dish with the reagent blank as reference.
4.1.4.4 Drawing of working curve
In a series of 50mL volumetric flasks (or colorimetric tubes), add 0.00, 1.00, 2.00, 3.00, 4.00, 5.00mL of phosphate standard solution (4.1.2.2), add about 20mL of water, then add 5mL of ammonium molybdate solution (4.1.2.3) and 3mL of ascorbic acid solution (4.1.2.4), dilute to the scale with water, and shake. Place at 25C~30℃ for 10min. At 710mm, use a 1cm colorimetric tube and use the reagent blank as reference. Measure its absorbance.
Use the milligrams of phosphate as the horizontal axis and the corresponding absorbance as the vertical axis to draw a working curve. 4.1.5 Expression of analysis results
4.1.5.1 The orthophosphate (as P3-) content X1 expressed as mass percentage is calculated according to formula (1):133
HG/T 2430-93
Xi=mX10-3
m×500
wherein m is the amount of orthophosphate (as PO-) in the sample solution obtained from the working curve, mg, and the mass of the sample, g.
4.1.5.2 The total phosphate (as PO-) content X2 expressed as mass percentage is calculated according to formula (2). X,wwW.bzxz.Net
m2×10-3
20×100-
m×500×500
wherein; m2——the amount of total phosphate (in terms of PO-) in the sample solution obtained from the working curve, g; m
mass of the sample, g.
4.1.5.3 The content of phosphonate (in terms of PO-) expressed as mass percentage, X3, is calculated according to formula (3). X =X2-Xi - XiX1. 203
Wherein: X1
Orthophosphate (in PO-) content, %;
X,——Total phosphate (in PO-) content, %;X——Phosphorous acid (in PO-) content expressed as mass percentage measured in accordance with Article 4.2, %;1.203-
Coefficient for converting phosphorous acid (in PO-) into phosphate (in PO). 4.1.6 Allowable difference
The arithmetic mean of the parallel determination results is taken as the determination result. The absolute difference between the results of two parallel determinations shall not exceed 0.30%. 4.2 Determination of phosphorous acid content
(3)
4.2.1 Summary of the method
Under the condition of pH 6.5~～7.5, phosphorous acid is oxidized by iodine to orthophosphoric acid, and the excess iodine is titrated with sodium thiosulfate to determine the phosphorous acid content.
4.2.2 Reagents and materials
Saturated ammonium borate solution;
4.2.2.2 Iodine (GB675): c(1/212)=0.1mol/L solution;4.2.2.3 Sulfuric acid (GB625): 1+4 solution;4.2.2.4 Sodium thiosulfate (GB637): standard titration solution c(Na2S,O,) = 0.1mol/L; 4.2.2.5 Soluble starch, 5g/L solution. 4.2.3 Analysis steps
4.2.3.1 Weigh 2~~3g of sample, accurate to 0.0002g. In a 250mL iodine volumetric flask, add about 25ml of water and 12mL of saturated ammonium borate solution (4.2.2.1), draw 15.00mL of iodine solution (4.2.2.2), immediately cover the bottle stopper, and add a water seal. Place in a dark place for 10~15min, then add 15mL of sulfuric acid solution (4.2.2.3) and titrate with sodium thiosulfate standard titration solution (4.2.2.4) until light yellow, then add 3ml of starch solution (4.2.2.5) and continue titrating until the blue disappears as the end point. 4.2.3.2 Blank test
In the blank test, except that no sample is added, the same analytical steps, reagents and dosages (except the dosage of the standard solution in the titration method) as those of the determination are used. Parallel operation is performed.
4.2.4 Expression of analysis results
The phosphorous acid (in terms of PO-) content X. expressed as mass percentage is calculated according to formula (4): X4=
(V.-- V)XcX3. 948
Wherein: V.—-the volume of sodium thiosulfate standard titration solution consumed in the blank test, mL; V—-the volume of sodium thiosulfate standard titration solution consumed by the titration sample, mL; the concentration of sodium thiosulfate standard titration solution, mol/L; 134
(4)
The mass of the sample,
HG/T 2430--93
0.03948—·The mass of phosphorous acid (in terms of PO-g) in grams equivalent to 1.00mL of standard titration solution Lc (NazS2O) = 1.000mol/LJ.
4.2.5 Allowable difference
The arithmetic mean of the parallel determination results shall be taken as the determination result. The absolute difference between the two parallel determination results shall not exceed 0.03%. 4.3 Determination of solid content
4.3.1 Instruments and equipment
General laboratory instruments and
4.3.1.1 Weighing bottle, 40mmX25mm
4.3.1.2 Constant-temperature drying oven
4.3.2 Analysis steps
Weigh about 1g of sample, accurate to 0.0002g, and place it in a weighing bottle (4.3.1.1) that has been weighed at 120℃, and then placed in a constant-temperature drying oven (4.3.1.2): dry at 120C±2℃ for 5h, take out and cool in a desiccator for 30min, and weigh. 4.3.3 Expression of analysis results
The solid content X5 expressed as a mass percentage is calculated according to Formula 5: mz-mo×100
Wherein: The mass of the sample and the weighing bottle after drying &n. The mass of the sample and the weighing bottle, g;
m. The mass of the weighing bottle?g.
4.3.4 Allowable difference
The arithmetic mean of the parallel determination results is taken as the determination result, and the absolute difference between the two parallel determination results shall not exceed 0.30%. 4.4 Determination of density
4.4.1 Instruments and equipment
4.4.1.1 Densitometer, with a graduation value of 0.001g/cm*; 4.4.1.2 Measuring cylinder, 250mL.
4.4.2 Determination
Inject the sample into a clean and dry volume cylinder (4.4.1.2) without any bubbles. Slowly immerse the clean and dry hydrometer (4.4.1.1) into the sample, with its lower end at least 2 cm away from the bottom of the cylinder. It cannot touch the cylinder wall, and the liquid on the exposed part of the upper end of the hydrometer must not exceed 2 to 3 scales. After the hydrometer stabilizes in the sample, read the scale value at the lower edge of the meniscus of the hydrometer. This is the density of the sample. 4.4.3 Allowable coupons
Take the arithmetic mean of the parallel determination results as the determination result, and the absolute difference between the two parallel determination results shall not exceed 0.005 g/cm2. 4.5 Determination of DH value
4.5.1 Instrument
4.5.1.1 Acidometer, with a scale value of 0.02 pH. 4.5.2 Determination
Pour the sample into a 100mL beaker and immerse the saturated Gan Bing electrode and glass electrode in the sample. Use a pH = 4.0 buffer solution to measure on the positioned acidometer (4.5.1.1) and read the pH value. 4.5.3 Allowable difference
Take the arithmetic mean of two consecutive readings as the measurement result, and the absolute difference between the parallel determination results shall not exceed 0.05pH. 5 Inspection rules
5.1 Scale and corrosion inhibitors shall be inspected by the quality supervision department of the manufacturer, and all batches of products leaving the factory shall meet the requirements of this standard. 135
HG/T2430--93
5.2 The user unit may verify whether the quality of the scale and corrosion inhibitor I received meets the requirements of this standard in accordance with the provisions of this standard. 5.3 Products shall be inspected by batch, and the quality of each batch shall not exceed 5t. 5.4 Each batch of products leaving the factory shall be accompanied by a quality certificate, which shall include: product name, manufacturer name, specification, grade, batch number, net weight, production date and this standard number.
5.5 When sampling, the sample shall be fully stirred first, and then a glass tube or polyethylene plastic tube shall be inserted into the barrel at two-thirds of the depth to take the sample. The sample taken from each barrel shall not be less than 100ml, and the total amount shall not be less than 1000ml. After being fully mixed, it shall be placed in two clean and dry bottles with ground stoppers, sealed, and labeled with the manufacturer name, product name, grade, batch number and sampling date. One bottle shall be inspected by the quality supervision department, and the other bottle shall be kept for ten months for future reference.
The number of sampling barrels shall be selected according to the provisions of Table 2
The total number of barrels per batch
1~10
82~101
102~125
126~151
152~181
182~216
The minimum number of barrels selected
The total number of barrels
5.6 If one of the indicators of the inspection results does not meet the requirements of this standard, re-sampling shall be carried out from the packaging barrels with twice the number of sampling barrels for verification. If there is still one indicator that does not meet the requirements of this standard, the whole batch of products shall be unqualified and cannot be accepted. 5.7 When the supply and demand parties have disputes over product quality, they shall be handled in accordance with the provisions of the "Interim Measures for National Product Quality Arbitration Inspection". 5.8 The rounded value comparison method specified in GB1250 shall be used to determine whether the inspection results meet the standards. 6 Packaging, marking, transportation and storage
6.1 Scale and corrosion inhibitor I is packaged in polyethylene plastic barrels or large iron barrels lined with polyethylene plastic liner. If outer packaging is required for long-distance transportation, the supply and demand parties shall negotiate separately.
6.2 Each net weight is 25kg or 200kg.
6.3 Each barrel should be marked with: manufacturer name, specification, grade, production date, batch number, net weight, trademark and this standard number. The outer packaging should be painted with the "upward" mark in accordance with (GB191. 6.4 This product should be stored at room temperature, keep ventilated, avoid exposure, and the storage period is ten months. 6.5 This product is suitable for transportation by conventional transportation methods. Additional remarks:
This standard is proposed by the Science and Technology Department of the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of the Tianjin Chemical Industry Research Institute of the Ministry of Chemical Industry. This standard was drafted by the Tianjin Chemical Industry Research Institute Pilot Plant of the Ministry of Chemical Industry. The main drafters of this standard are Yang Cui, Wang Meiying, and Shao Weiren. 136mL; V—-volume of sodium thiosulfate standard titration solution consumed by the titration sample, mL; concentration of sodium thiosulfate standard titration solution, mol/L; 134
(4)
mass of the sample,
HG/T 2430--93
0.03948—·mass of phosphorous acid (in POg) expressed in grams equivalent to 1.00mL of standard titration solution Lc (NazS2O) = 1.000mol/LJ.
4.2.5 Allowable difference
The arithmetic mean of the parallel determination results shall be taken as the determination result. The absolute difference between the two parallel determination results shall not exceed 0.03%. 4.3 Determination of solid content
4.3.1 Instruments and equipment
General laboratory instruments and equipment
4.3.1.1 Weighing bottle, 40mmX25mm
4.3.1.2 Constant-temperature drying oven
4.3.2 Analysis steps
Weigh about 1g of sample with an accuracy of 0.0002g, and place it in a weighing bottle (4.3.1.1) that has been weighed at a constant temperature of 120℃, and then put it into a constant-temperature drying oven (4.3.1.2): dry at 120℃±2℃ for 5h, take it out and cool it in a desiccator for 30min, and weigh it. 4.3.3 Expression of analysis results
The solid content X5 expressed as a mass percentage is calculated according to Formula 5: mz-mo×100
Wherein: The mass of the sample and the weighing bottle after drying &n. The mass of the sample and the weighing bottle, g;
m. The mass of the weighing bottle?g.
4.3.4 Allowable difference
The arithmetic mean of the parallel determination results is taken as the determination result, and the absolute difference between the two parallel determination results shall not exceed 0.30%. 4.4 Determination of density
4.4.1 Instruments and equipment
4.4.1.1 Density meter, with a graduation value of 0.001g/cm*; 4.4.1.2 Graduated cylinder, 250mL.
4.4.2 Determination
Inject the sample into a clean and dry volume cylinder (4.4.1.2) without any bubbles. Slowly immerse the clean and dry hydrometer (4.4.1.1) into the sample, with its lower end at least 2 cm away from the bottom of the cylinder. It cannot touch the cylinder wall, and the liquid on the exposed part of the upper end of the hydrometer must not exceed 2 to 3 scales. After the hydrometer stabilizes in the sample, read the scale value at the lower edge of the meniscus of the hydrometer. This is the density of the sample. 4.4.3 Allowable coupons
Take the arithmetic mean of the parallel determination results as the determination result, and the absolute difference between the two parallel determination results shall not exceed 0.005 g/cm2. 4.5 Determination of DH value
4.5.1 Instrument
4.5.1.1 Acidometer, with a scale value of 0.02 pH. 4.5.2 Determination
Pour the sample into a 100mL beaker and immerse the saturated Gan Bing electrode and glass electrode in the sample. Use a buffer solution of pH = 4.0 to measure on the positioned acidometer (4.5.1.1) and read the pH value. 4.5.3 Allowable difference
Take the arithmetic mean of two consecutive readings as the measurement result, and the absolute difference between the parallel determination results shall not exceed 0.05pH. 5 Inspection rules
5.1 Scale and corrosion inhibitors shall be inspected by the quality supervision department of the manufacturer, and all batches of products leaving the factory shall meet the requirements of this standard. 135
HG/T2430--93
5.2 The user unit may verify whether the quality of the scale and corrosion inhibitor I received meets the requirements of this standard in accordance with the provisions of this standard. 5.3 Products shall be inspected by batch, and the quality of each batch shall not exceed 5t. 5.4 Each batch of products leaving the factory shall be accompanied by a quality certificate, which shall include: product name, manufacturer name, specification, grade, batch number, net weight, production date and this standard number.
5.5 When sampling, the sample shall be fully stirred first, and then a glass tube or polyethylene plastic tube shall be inserted into the barrel at two-thirds of the depth to take the sample. The sample taken from each barrel shall not be less than 100ml, and the total amount shall not be less than 1000ml. After being fully mixed, it shall be placed in two clean and dry bottles with ground stoppers, sealed, and labeled with the manufacturer name, product name, grade, batch number and sampling date. One bottle shall be inspected by the quality supervision department, and the other bottle shall be kept for ten months for future reference.
The number of sampling barrels shall be selected according to the provisions of Table 2
The total number of barrels per batch
1~10
82~101
102~125
126~151
152~181
182~216
The minimum number of barrels selected
The total number of barrels
5.6 If one of the indicators of the inspection results does not meet the requirements of this standard, re-sampling shall be carried out from the packaging barrels with twice the number of sampling barrels for verification. If there is still one indicator that does not meet the requirements of this standard, the whole batch of products shall be unqualified and cannot be accepted. 5.7 When the supply and demand parties have disputes over product quality, they shall be handled in accordance with the provisions of the "Interim Measures for National Product Quality Arbitration Inspection". 5.8 The rounded value comparison method specified in GB1250 shall be used to determine whether the inspection results meet the standards. 6 Packaging, marking, transportation and storage
6.1 Scale and corrosion inhibitor I is packaged in polyethylene plastic barrels or large iron barrels lined with polyethylene plastic liner. If outer packaging is required for long-distance transportation, the supply and demand parties shall negotiate separately.
6.2 Each net weight is 25kg or 200kg.
6.3 Each barrel should be marked with: manufacturer name, specification, grade, production date, batch number, net weight, trademark and this standard number. The outer packaging should be painted with the "upward" mark in accordance with (GB191. 6.4 This product should be stored at room temperature, keep ventilated, avoid exposure, and the storage period is ten months. 6.5 This product is suitable for transportation by conventional transportation methods. Additional remarks:
This standard is proposed by the Science and Technology Department of the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of the Tianjin Chemical Industry Research Institute of the Ministry of Chemical Industry. This standard was drafted by the Tianjin Chemical Industry Research Institute Pilot Plant of the Ministry of Chemical Industry. The main drafters of this standard are Yang Cui, Wang Meiying, and Shao Weiren. 136mL; V—-volume of sodium thiosulfate standard titration solution consumed by the titration sample, mL; concentration of sodium thiosulfate standard titration solution, mol/L; 134
(4)
mass of the sample,
HG/T 2430--93
0.03948—·mass of phosphorous acid (in POg) expressed in grams equivalent to 1.00mL of standard titration solution Lc (NazS2O) = 1.000mol/LJ.
4.2.5 Allowable difference
The arithmetic mean of the parallel determination results shall be taken as the determination result. The absolute difference between the two parallel determination results shall not exceed 0.03%. 4.3 Determination of solid content
4.3.1 Instruments and equipment
General laboratory instruments and equipment
4.3.1.1 Weighing bottle, 40mmX25mm
4.3.1.2 Constant-temperature drying oven
4.3.2 Analysis steps
Weigh about 1g of sample with an accuracy of 0.0002g, and place it in a weighing bottle (4.3.1.1) that has been weighed at a constant temperature of 120℃, and then put it into a constant-temperature drying oven (4.3.1.2): dry at 120℃±2℃ for 5h, take it out and cool it in a desiccator for 30min, and weigh it. 4.3.3 Expression of analysis results
The solid content X5 expressed as a mass percentage is calculated according to Formula 5: mz-mo×100
Wherein: The mass of the sample and the weighing bottle after drying &n. The mass of the sample and the weighing bottle, g;
m. The mass of the weighing bottle?g.
4.3.4 Allowable difference
The arithmetic mean of the parallel determination results is taken as the determination result, and the absolute difference between the two parallel determination results shall not exceed 0.30%. 4.4 Determination of density
4.4.1 Instruments and equipment
4.4.1.1 Densitometer, with a graduation value of 0.001g/cm*; 4.4.1.2 Measuring cylinder, 250mL.
4.4.2 Determination
Inject the sample into a clean and dry volume cylinder (4.4.1.2) without any bubbles. Slowly immerse the clean and dry hydrometer (4.4.1.1) into the sample, with its lower end at least 2 cm away from the bottom of the cylinder. It cannot touch the cylinder wall, and the liquid on the exposed part of the upper end of the hydrometer must not exceed 2 to 3 scales. After the hydrometer stabilizes in the sample, read the scale value at the lower edge of the meniscus of the hydrometer. This is the density of the sample. 4.4.3 Allowable coupons
Take the arithmetic mean of the parallel determination results as the determination result, and the absolute difference between the two parallel determination results shall not exceed 0.005 g/cm2. 4.5 Determination of DH value
4.5.1 Instrument
4.5.1.1 Acidometer, with a scale value of 0.02 pH. 4.5.2 Determination
Pour the sample into a 100mL beaker and immerse the saturated Gan Bing electrode and glass electrode in the sample. Use a pH = 4.0 buffer solution to measure on the positioned acidometer (4.5.1.1) and read the pH value. 4.5.3 Allowable difference
Take the arithmetic mean of two consecutive readings as the measurement result, and the absolute difference between the parallel determination results shall not exceed 0.05pH. 5 Inspection rules
5.1 Scale and corrosion inhibitors shall be inspected by the quality supervision department of the manufacturer, and all batches of products leaving the factory shall meet the requirements of this standard. 135
HG/T2430--93
5.2 The user unit may verify whether the quality of the scale and corrosion inhibitor I received meets the requirements of this standard in accordance with the provisions of this standard. 5.3 Products shall be inspected by batch, and the quality of each batch shall not exceed 5t. 5.4 Each batch of products leaving the factory should be accompanied by a quality certificate, which includes: product name, manufacturer name, specifications, grade, batch number, net weight, production date and this standard number.
5.5 When sampling, stir thoroughly first, then insert a glass tube or polyethylene plastic tube into the barrel at two-thirds of the depth to take a sample. The sample taken from each barrel must not be less than 100ml, and the total amount must not be less than 1000ml. After being fully mixed, put it into two clean, dry bottles with ground stoppers, seal them, and stick labels, indicating the manufacturer name, product name, grade, batch number and sampling date. One bottle will be inspected by the quality supervision department, and the other bottle will be kept for ten months for reference.
The number of sampling barrels shall be selected according to the provisions of Table 2
The total number of barrels per batch
1~10
82~101
102~125
126~151
152~181
182~216
The minimum number of barrels selected
The total number of barrels
5.6 If one of the indicators of the inspection results does not meet the requirements of this standard, re-sampling shall be carried out from the packaging barrels with twice the number of sampling barrels for verification. If there is still one indicator that does not meet the requirements of this standard, the whole batch of products shall be unqualified and cannot be accepted. 5.7 When the supply and demand parties have disputes over product quality, they shall be handled in accordance with the provisions of the "Interim Measures for National Product Quality Arbitration Inspection". 5.8 The rounded value comparison method specified in GB1250 shall be used to determine whether the inspection results meet the standards. 6 Packaging, marking, transportation and storage
6.1 Scale and corrosion inhibitor I is packaged in polyethylene plastic barrels or large iron barrels lined with polyethylene plastic liner. If outer packaging is required for long-distance transportation, the supply and demand parties shall negotiate separately.
6.2 Each net weight is 25kg or 200kg.
6.3 Each barrel should be marked with: manufacturer name, specification, grade, production date, batch number, net weight, trademark and this standard number. The outer packaging should be painted with the "upward" mark in accordance with (GB191. 6.4 This product should be stored at room temperature, keep ventilated, avoid exposure, and the storage period is ten months. 6.5 This product is suitable for transportation by conventional transportation methods. Additional remarks:
This standard is proposed by the Science and Technology Department of the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of the Tianjin Chemical Industry Research Institute of the Ministry of Chemical Industry. This standard was drafted by the Tianjin Chemical Industry Research Institute Pilot Plant of the Ministry of Chemical Industry. The main drafters of this standard are Yang Cui, Wang Meiying, and Shao Weiren. 1362 Determination
Pour the sample into a 100mL beaker and immerse the saturated Gan Bing electrode and glass electrode in the sample. Use a pH = 4.0 buffer solution to measure on the positioned acidometer (4.5.1.1) and read the pH value. 4.5.3 Allowable difference
Take the arithmetic mean of two consecutive readings as the measurement result, and the absolute difference between the parallel determination results shall not exceed 0.05pH. 5 Inspection rules
5.1 Scale and corrosion inhibitors shall be inspected by the quality supervision department of the manufacturer, and all batches of products leaving the factory shall meet the requirements of this standard. 135
HG/T2430--93
5.2 The user unit may verify whether the quality of the scale and corrosion inhibitor I received meets the requirements of this standard in accordance with the provisions of this standard. 5.3 Products shall be inspected by batch, and the quality of each batch shall not exceed 5t. 5.4 Each batch of products leaving the factory should be accompanied by a quality certificate, which includes: product name, manufacturer name, specifications, grade, batch number, net weight, production date and this standard number.
5.5 When sampling, stir thoroughly first, then insert a glass tube or polyethylene plastic tube into the barrel at two-thirds of the depth to take a sample. The sample taken from each barrel must not be less than 100ml, and the total amount must not be less than 1000ml. After being fully mixed, put it into two clean, dry bottles with ground stoppers, seal them, and stick labels, indicating the manufacturer name, product name, grade, batch number and sampling date. One bottle will be inspected by the quality supervision department, and the other bottle will be kept for ten months for reference.
The number of sampling barrels shall be selected according to the provisions of Table 2
The total number of barrels per batch
1~10
82~101
102~125
126~151
152~181
182~216
The minimum number of barrels selected
The total number of barrels
5.6 If one of the indicators of the inspection results does not meet the requirements of this standard, re-sampling shall be carried out from the packaging barrels with twice the number of sampling barrels for verification. If there is still one indicator that does not meet the requirements of this standard, the whole batch of products shall be unqualified and cannot be accepted. 5.7 When the supply and demand parties have disputes over product quality, they shall be handled in accordance with the provisions of the "Interim Measures for National Product Quality Arbitration Inspection". 5.8 The rounded value comparison method specified in GB1250 shall be used to determine whether the inspection results meet the standards. 6 Packaging, marking, transportation and storage
6.1 Scale and corrosion inhibitor I is packaged in polyethylene plastic barrels or large iron barrels lined with polyethylene plastic liner. If outer packaging is required for long-distance transportation, the supply and demand parties shall negotiate separately.
6.2 Each net weight is 25kg or 200kg.
6.3 Each barrel should be marked with: manufacturer name, specification, grade, production date, batch number, net weight, trademark and this standard number. The outer packaging should be painted with the "upward" mark in accordance with (GB191. 6.4 This product should be stored at room temperature, keep ventilated, avoid exposure, and the storage period is ten months. 6.5 This product is suitable for transportation by conventional transportation methods. Additional remarks:
This standard was proposed by the Science and Technology Department of the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of the Tianjin Chemical Industry Research Institute of the Ministry of Chemical Industry. This standard was drafted by the Tianjin Chemical Industry Research Institute Pilot Plant of the Ministry of Chemical Industry. The main drafters of this standard are Yang Cui, Wang Meiying, and Shao Weiren. 1362 Determination
Pour the sample into a 100mL beaker and immerse the saturated Gan Bing electrode and glass electrode in the sample. Use a pH = 4.0 buffer solution to measure on the positioned acidometer (4.5.1.1) and read the pH value. 4.5.3 Allowable difference
Take the arithmetic mean of two consecutive readings as the measurement result, and the absolute difference between the parallel determination results shall not exceed 0.05pH. 5 Inspection rules
5.1 Scale and corrosion inhibitors shall be inspected by the quality supervision department of the manufacturer, and all batches of products leaving the factory shall meet the requirements of this standard. 135
HG/T2430--93
5.2 The user unit may verify whether the quality of the scale and corrosion inhibitor I received meets the requirements of this standard in accordance with the provisions of this standard. 5.3 Products shall be inspected by batch, and the quality of each batch shall not exceed 5t. 5.4 Each batch of products leaving the factory should be accompanied by a quality certificate, which includes: product name, manufacturer name, specifications, grade, batch number, net weight, production date and this standard number.
5.5 When sampling, stir thoroughly first, then insert a glass tube or polyethylene plastic tube into the barrel at two-thirds of the depth to take a sample. The sample taken from each barrel must not be less than 100ml, and the total amount must not be less than 1000ml. After being fully mixed, put it into two clean, dry bottles with ground stoppers, seal them, and stick labels, indicating the manufacturer name, product name, grade, batch number and sampling date. One bottle will be inspected by the quality supervision department, and the other bottle will be kept for ten months for reference.
The number of sampling barrels shall be selected according to the provisions of Table 2
The total number of barrels per batch
1~10
82~101
102~125
126~151
152~181
182~216
The minimum number of barrels selected
The total number of barrels
5.6 If one of the indicators of the inspection results does not meet the requirements of this standard, re-sampling shall be carried out from the packaging barrels with twice the number of sampling barrels for verification. If there is still one indicator that does not meet the requirements of this standard, the whole batch of products shall be unqualified and cannot be accepted. 5.7 When the supply and demand parties have disputes over product quality, they shall be handled in accordance with the provisions of the "Interim Measures for National Product Quality Arbitration Inspection". 5.8 The rounded value comparison method specified in GB1250 shall be used to determine whether the inspection results meet the standards. 6 Packaging, marking, transportation and storage
6.1 Scale and corrosion inhibitor I is packaged in polyethylene plastic barrels or large iron barrels lined with polyethylene plastic liner. If outer packaging is required for long-distance transportation, the supply and demand parties shall negotiate separately.
6.2 Each net weight is 25kg or 200kg.
6.3 Each barrel should be marked with: manufacturer name, specification, grade, production date, batch number, net weight, trademark and this standard number. The outer packaging should be painted with the "upward" mark in accordance with (GB191. 6.4 This product should be stored at room temperature, keep ventilated, avoid exposure, and the storage period is ten months. 6.5 This product is suitable for transportation by conventional transportation methods. Additional remarks:
This standard was proposed by the Science and Technology Department of the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of the Tianjin Chemical Industry Research Institute of the Ministry of Chemical Industry. This standard was drafted by the Tianjin Chemical Industry Research Institute Pilot Plant of the Ministry of Chemical Industry. The main drafters of this standard are Yang Cui, Wang Meiying, and Shao Weiren. 136
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