Lauryl ether sulfate de sodium
3. Sodium lauryl ether sulfate SLES Test Methods
3.1 Sodium lauryl ether sulfate SLES Identification Tests
3.1.1 To an aqueous solution of the sample (1→10), add 1 drop of potassium pyroantimonate test solution. A white crystalline precipitate is formed. To accelerate precipitation formation, rub the inside of the test tube with a glass rod.
3.1.2 Acidify an aqueous solution of the sample (1→10) with dilute hydrochloric acid (10%) and boil gently. After cooling the solution, add barium chloride test solution. A white precipitate is formed.
3.1.3 Based on the labeled content, take an amount equivalent to 5g of Sodium Laureth Sulfate and add water to make 100mL. Use this as the test solution. To 1 drop of the test solution, add 5mL of methylene blue test solution (0.1g methylene blue dissolved in 100mL ethanol) and 1mL of chloroform. Shake the mixture and allow it to stand. The chloroform layer turns blue.
3.1.4 Based on the labeled content, take an amount equivalent to 0.5g of Sodium lauryl ether sulfate SLES. Add 10mL of water and 5mL of ammonium thiocyanate-cobalt nitrate test solution. Shake vigorously to mix, then add 5mL of chloroform and shake again. Allow it to stand. The chloroform layer turns blue.