苋菜红两相滴定法测定水中阴离子表面活性剂

Determination of Anionic Surfactants in Water by a Two-phase Titrimetric Method with Amaranthas an Indicator

本文首次提出以苋菜红为指示剂,用两相滴定法测定水中阴离子表面活性剂的方法。用此法测定了环境水样中的阴离子表面活性剂,相对标准差为0.65％～6.5％,回收率为94％～105％,检测下限为50μg/L。方法简便,快速,具有良好的选择性,适用于河水和生活废水中阴离子表面活性剂的测定。

A two-phase titrimetric method with amaranth as an indicator has for the first time been developed for the determination of anionic surfactants in water. The anionic surfactant content of environmental water samples has been determined by using this method. The recoveries of environmental water samples were 94. 0%~105% with a relative standard devia- tion of 0. 65%~ 6. 5%. The lower limit of determination was 50μg/L. The result shows that this method is simple and rapid. It has a good selectivity and can be applied to the determination of anionic surfactants in river water and wastewater.