GB/T 5174-1985 Determination of cationic active matter in detergents Direct two-phase titration method GB/T5174-1985 standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Determination of cationic-active matter in detergents
Direct two-phase titration procedure
Surface active agents-Detergents-Determinationof cationic-active matter-Direct two-phase titration procedure
UDC 661.185
GB 5174-85
ISO 2871 --1973
This standard is equivalent to the international standard ISO2871-1973 "Surface active agents-Detergents-Determination of cationic-active matter-Direct two-phase titration procedure".
Scope of application
This standard specifies the determination method of cationic-active matter in detergents. This method is applicable to the analysis of cationic-active matter such as long-chain quaternary ammonium compounds, laurylamine salts and imidazolinium salts. This method is applicable to water-soluble solid active matter or active matter aqueous solution. If its content is expressed as mass percentage, the molecular weight of the cationic-active matter must be known or determined in advance. Common organic or inorganic components in detergents, such as non-ionic surfactants, soap, urea, ethylenediaminetetraacetate, carboxymethyl cellulose, sodium chloride, sodium sulfate, sodium borate, sodium tripolyphosphate, sodium perborate and sodium silicate, do not interfere with the analysis. Other bleaching agents (non-sodium perborate) should be destroyed before analysis. 2 Principle
Same as GB5173-85 "Determination of anionic active substances in detergents Sodium lauryl sulfate standard solution.
3 Reagents
The water used is distilled water.
3.1 Trichloromethane (chloroform) (GB682-78). 3.2 Sulfuric acid (GB 625-77): 5N solution. Direct two-phase titration method". Titrate a certain amount with the sample solution. Carefully add 134ml sulfuric acid to 300ml water and dilute to 1000ml. 3.3 Sodium lauryl sulfate: 0.004M standard solution. Same as 3.5 of GB5173-85. 3.4 Acidic mixed indicator solution, same as 3.8.2 of GB5173-85. , Instruments bzxZ.net
In addition to the commonly used experimental instruments, there are:
4.1 Glass measuring cylinder with stopper: 100ml.
4.2 Burette: 25ml or 50ml.
4.3 Volumetric flask: 1000ml.
4.4 Pipette: 10ml.
Promulgated by the State Bureau of Standards on May 10, 1985
Implemented on January 1, 1986
5 Sample collection and preparation
5.1 Sampling
Weigh about 5g of sample, accurate to 1 mg.
5.2 Preparation of sample solution
GB 5174--85
Dissolve the sample in 100ml of water, pour into a 1000ml volumetric flask (4.3), dilute with water to the mark, and mix. 6 Test steps
Use a pipette (4.4) to draw 10ml of sodium lauryl sulfate standard solution (3.3) into a stoppered measuring cylinder (4.1), add 10ml of water, 15ml of chloroform (3.1) and 10ml of acidic mixed indicator solution (3.4). Fill the burette (4.2) with the sample solution (5.2). Titrate the sodium lauryl sulfate solution with the sample solution (5.2). After each addition of the sample solution, plug the stopper, shake thoroughly, and let stand to separate the layers. The lower layer should be pink. When approaching the titration endpoint, the emulsion formed by shaking is easier to break, and then titrate drop by drop, shake thoroughly, and when the pink color of the chloroform layer completely fades and turns into light gray-blue, the endpoint is reached. Record the number of milliliters of sample solution consumed in the titration.
The volume of sample solution consumed is at least 10ml. If it is less than 10ml, the corresponding sample volume should be adjusted and the test should be repeated. 7. Expression of results
7.1 Calculation
The mass percentage of cationic active matter X (%) is calculated according to formula (1): X=M×C×1000
If expressed in milligram equivalent/gram (mN/g), it is calculated according to formula (2): W
Wherein: X-
-Mass percentage of cationic active matter, %M-molecular weight of cationic active matter,
C-molar concentration of sodium lauryl sulfate solution;-Mass of sample, g,
V-—Volume of sample solution consumed in titration, ml, W
-Cationic active matter content, mN/g.
7.2 Repeatability
C×1000
For the same sample, the same analyst uses the same instrument to measure twice in succession, and the difference in the results should not exceed 1.5% of the average value. 7.3 Reproducibility
For the same sample, the difference in results in two different laboratories should not exceed 3% of the mean value. 8 Test report
The test report should include the following items:
The method used;
The results obtained,
Operations not specified in this standard or added, and any unexpected phenomena that may affect the results, the name, model, status and manufacturer of the sample, the test date, and the test personnel.
Additional notes:
GB517485
This standard was proposed by the Ministry of Light Industry of the People's Republic of China and is under the jurisdiction of the Daily Chemical Industry Scientific Research Institute of the Ministry of Light Industry. This standard was drafted by the Shanghai Daily Chemical Industry Research Institute. The main drafters of this standard are Jiang Zhijie and Du Peifen. 10
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.