环境水样及蔬菜中NO_2^-和NO_3^-的流动注射光度法同时测定

Simultaneous Spectrophotometric Determination of Nitrite and Nitratein Environmental Water and Vagetable by Flow Injection Analysis

将流动注射技术引入Ｎ－（１－萘基）乙烯二胺光度法测定ＮＯ－２分析体系，采用单阀双带注入镀镉锌片还原柱带隔离的阀体流路，建立了同时测定微量ＮＯ－２和ＮＯ－３的分析方法．ＮＯ－２－Ｎ的测定范围为０．０１—２．０μｇ／ｍｌ，ＮＯ－３－Ｎ的测定范围为０．０５—５．０μｇ／ｍｌ，分析速度为３０样／ｈ．方法应用于环境水样及蔬菜中ＮＯ－２和ＮＯ－３的同时测定，结果满意．

A flow injection spectrophotometry is proposed for simultaneous determination of nitrite and nitrate based on the N-(1-naphthyl)- ethylenediamine spectrophotometry.A technique of double zone injection and reductor column of cadmium plated zinc power zone isolation is adopted.The ranges of determination are 0.01—2.0μg/ml for NO_2^- N and 0.05—5.0 μg/ml for NO_3^-NThe sampling rate is 30 samples per hour.This method has been applied to the determination of nitrite and nitrate in environmental waters and vagetables with satisfactory results.