亚甲蓝分光光度法测定水体中的阴离子表面活性剂

DETERMINATION OF ANIONIC SURFACE-ACTIVE AGENT IN THE SURFACE WATER BY SPECTROPHOTOMETRY WITH METHYLENE BLUE

利用三氯甲烷萃取水体样品中的阴离子表面活性剂,用50mL比色管代替50mL容量瓶对三氯甲烷萃取液进行定容,以亚甲蓝分光光度法进行测定。该方法操作简便,测定阴离子表面活性剂的线性范围为0.150～1.70mg/L,检出限为0.050mg/L,样品加标回收率为89％～98％。

Having been extracted by CHCl3, the anionic surface-active agent in the surface water was determined by spectro-photometry with methylene blue, and CHC13 extraction solution was diluted to 50 mL in the colorimetric tube instead of the volumetric bottle. The method is simple, the linear range of the anionic surface-active agent is 0. 150-1. 70 mg/L, the detection limit is 0. 050 mg/L, and the recovery is 89% -98% .