流动注射化学发光法测定氨氮的研究

根据氨与次氯酸盐反应使次氯酸盐-Luminol化学发光强度降低,建立了测定氨的流动注射化学发光法。试验了各种条件对发光强度的影响,考查了方法的精密度和准确度。在优化条件下,方法的线性范围为0.02—0.5mg/L,变异系数小于5.2％,相对误差小于±8.0％。分析速度为120次/h。用于天然水氨气分析获得满意结果。

Chemiluminescence Determination of Ammonia cat Nitrogen Using Plow Injection Analysis

A flow injection system for determination of ammonia based on the chemiluminescence reaction between hypochlorite and luminol has been developed. Ammonia reacts with hypochlorite to form monochloramine in basic solution which decreases the observed chemilumines-cence intensity. The method has the advantages pf high sensitivity, high speed and automation. The linear range of determination is 0.02-0.5 mg/L, the variation coefficient is within 5.2% and the relative error less than ±8%. The method has been applied to determination of ammoniacal nitrogen in natural water with the recovery of 86-95%.