一种新的顺序注射分析系统测定水中亚硝酸根

Determination of Nitrite by Electrokinetically Sequential Injection Analysis System

采用电动流动分析系统的顺序注射分析法测定了自来水中亚硝酸根含量。该系统由一台电渗泵和两个电磁三通阀组成 ,均由计算机控制 ,实现了准确、重现和自动的分析要求。测定亚硝态氮的线性浓度范围为 0 .0 10～ 0 .80 0mg L ,检出限为 1μg L (3σ ,n =11)。本方法每小时能够测定 4 0个样品。

A novel sequential injection analysis (SIA) method based on electrokinetic flow analysis (EKFA) system for the determination of nitrite in tap water is reported. The proposed system consists of an electroosmotic pump and two solenoid valves, all of which are controlled by a PC computer automatically. By the SIA method, accurate, reproducible and automatic determination of nitrite is achieved. The linear calibration range of nitrite-nitrogen is 0.010 similar to 0.800 mg/L. The detection limit is 1 mug/L (3sigma, n = 11). The method possesses a determination frequency of 40 samples per hour.