废水中含磷表面活性剂的测定

Determination of Alkylphosphate Surfactants in Wastewater

用罗丹明６Ｇ分光光度法能测定亚甲基蓝分光光度法不能测定的含磷阴离子表面活性剂．本法变异系数２．７％（ｎ＝１４），最小检出浓度８．２×１０－８ｍｏｌ／Ｌ（ｎ＝２１），加标回收率９１．８％～１０８．３％，测定ＰＫ、Ｅ５０２Ａ、昆山ＰＫ的摩尔吸光系数分别为１．１６８×１０５、１．１７５×１０５和１．１３３×１０５Ｌ／ｍｏｌ．ｃｍ，标准曲线的相关系数０．９９９４。方法准确、简单、方便，水中常见的ＮａＣｌ、硬度、蛋白质、非离子表面活性剂、磷酸盐等不干扰测定。

The Rhodamine 6G spectrometric method was developed to determinate alkylphosphate surfactants which can not be determinated by the methylene blue spectrometric method. The coefficient of variation was 2. 7%(n= 14),minimum detectable concentration 8.2×10-8 mol/L(n= 21)and recovery 91. 8%～108. 3%. The molar, absorptivity for PK、E502A.and Kunshan PK were 1. 168 × 105、 1. 175 × 105 and 1. 133 × 105 L/mol·cm respectively.The correlation coefficient of calibration curve was 0. 9994. The Operation was simple and fast, and the results were accurate.Interferences from NaCl、hardness、Protein、nonionic surfactants、phosphate existing in water body were eliminated .