自动转换流动注射法快速测定制革废液中的氨氮和亚硝酸盐氮

摘要

A three-way valve connected before peristaltic pump to modify the flow path of flow injection( FIA) analyzer,it achieved fast and automatic determination of ammonia and nitrite nitrogen with auto-Conversion by three-way valve. With chromogenic system of sulfa-NED.The absorbance was measured at 530nm. the linear range is 8-200μg·L-1 for ammonia nitrogen and 2-50 μg·L-1 for nitrite nitrogenjthe detection limit for NH/-N and N0/-N are 0. 21μg·L-1 and 0. 15μg·L-1 ,and RSD are 1.48% (n= 10)and 1. 00% (n= 11) .respectively. This method has been used to determine NH4+-N and NO2--N in tannery effluent, result shows the recovery is between 98. 6% and 101. 0%.%对流动注射(FLA)分析仪流路进行改装,在蠕动泵前连接三通阀,通过三通阀的自动换样,实现了废液中氨氮和亚硝酸氮的快速自动测定.使用磺胺-NED显色体系,在530nm波长处有光吸收,氨氮和亚硝酸盐的测定范围分别为8～200μg·L-1和2 ～50μg·L-1,检出限分别为0.41μg·L-1和0.15μg-L-1,精密度RSD为1.48％(n=10)和1.00％ (n=10).该方法可用于制革废液中氨氮和亚硝酸盐的测定,加标回收率在98.6％～101％.