两相滴定法分析阴离子表面活性剂含量——二氯甲烷替代三氯甲烷在洗衣粉检测分析中的应用

国标GB/T5173阴离子活性物的测定用两相滴定法,在水和三氯甲烷的两相介质中,在酸性混合指示剂存在下,用阳离子表面活性剂海明1622滴定,测定阴离子活性物。在该反应的基础上,应用二氯甲烷代替三氯甲烷,结果表明,该法具有良好的精密度和准确度(标准差s=0.036,相对标准偏差RSD=0.24%),并且二氯甲烷的毒性只有三氯甲烷的1/10,用二氯甲烷替代三氯甲烷对洗衣粉阴离子含量的检测,具有经济性、安全性、实用性的明显优势。

Analysis of anionic surfactant content by two-phase titration——dichloromethane,a replacement reagent for chloroform in the detergent test analysis

In the GB/T5173 determination of anionic active matter,chloroform is used in a two-phase titration,in the presence of a acid mixed indicator and a cationic surfactant Hamming 1622,which determining the content of anionic surfactant.Based on the reaction,the application of dichloromethane instead of chloroform,shows that the method has good precision and accuracy,and furthermore,the toxicity of dichloromethane is only 1/10 that of chloroform,and also has the obvious advantages of economy,safety,and practicality.