Emulsifier testing

A. Some of the testing processes specified in the warning test method may lead to hazardous situations. Operators should take appropriate safety and protective measures. A. 2 General regulations: Unless otherwise specified, only reagents confirmed as analytical pure and Grade III water specified in GB/T 6682-2008 shall be used in the analysis. The standard titration solution, impurity determination standard solution, formulation, and product used in the test method shall be prepared in accordance with the provisions of GB/T 601, GB/T 602, and GB/T 603 unless otherwise specified. A. 3 Identification test A.3.1 Determination of iodine value of fatty acids A.3.1.1 Reagents and materials A.3.1.1.1 Carbon tetrachloride. A. 3.1.1.2 Potassium iodide solution: 100g/L. A. 3.1.1.3 Webster's solution: The preparation method is shown in Appendix B. A. 3.1.1.4 Sodium thiosulfate standard titration solution: c (NazSzO3)=0.1mol/L. A. 3.1.1.5 Starch indicator solution: 10g/L. A. 3.1.2 Identification step: Weigh approximately 0.27g of viscous substance D in A.4.3.2 to the nearest 0.000 1g, place it in a dry 500mL iodine volumetric flask, and add 10mL of carbon tetrachloride for dissolution. Add 25mL of 0.02mL of Wechsler's solution, stopper the bottle tightly, seal with potassium iodide solution, and place in a dark place for 30 minutes. Add 15mL of potassium iodide solution and 100mL of water, titrate with sodium thiosulfate standard titration solution until the solution turns light yellow, add 1mL of starch indicator solution, shake vigorously and continue titration until the blue color just disappears, which is the endpoint. At the same time as the measurement, perform a blank test using the same amount of reagent solution without the addition of test materials, following the same steps as the measurement

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