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溴酸钾-亚甲蓝催化光度法测定硝酸盐和亚硝酸盐
引用本文:袁亚莉,邓健,许金生.溴酸钾-亚甲蓝催化光度法测定硝酸盐和亚硝酸盐[J].光谱学与光谱分析,2002,22(5):806-808.
作者姓名:袁亚莉  邓健  许金生
作者单位:1. 南华大学化学化工学院,湖南,衡阳,421001
2. 衡阳师范学院,湖南,衡阳,421008
基金项目:衡阳市科委资助课题,编号 :2 0 0 2 0 1 5
摘    要:用镉柱将NO-3 还原为NO-2 ,利用在磷酸介质中NO-2 对溴酸钾氧化亚甲蓝这一褪色反应具有强烈的催化作用而建立了同时测定痕量硝酸盐和亚硝酸盐的新方法。本方法简便、快速、灵敏 ,对亚硝酸盐和硝酸盐测定的线性范围分别为 0~ 2 0 0 μg·L-1和 0 0 0 3~ 310 μg·L-1,用于测定各种水样中痕量NO-2 和NO-3 的含量均获得满意结果

关 键 词:溴酸钾  亚甲蓝  测定  硝酸盐  亚硝酸盐  镉柱  催化光度法  环境分析  水样  痕量分析
文章编号:1000-0593(2002)05-0806-03
修稿时间:2002年6月8日

Determination of Nitrate and Nitrite by Catalytic Spectrophotometry of Potassium Bromate-methylene Blue System
YUAN Ya-li ,DENG Jian ,XU Jin-sheng .College of Chemistry and Chemical Engineering,Nanhua University,Hengyang ,China.Determination of Nitrate and Nitrite by Catalytic Spectrophotometry of Potassium Bromate-methylene Blue System[J].Spectroscopy and Spectral Analysis,2002,22(5):806-808.
Authors:YUAN Ya-li  DENG Jian  XU Jin-sheng College of Chemistry and Chemical Engineering  Nanhua University  Hengyang  China
Institution:College of Chemistry and Chemical Engineering, Nanhua University, Hengyang 421001, China.
Abstract:Nitrate and nitrite is one of important physical and chemical index in the analysis of environmental samples. A new catalytic spectrophotometric method for the determination of nitrate and nitrite has been established based on the catalytic action of nitrite on the oxidative fading reaction of methylene blue with potassium bromate in dilute phosphoric acid medium. The optimum experimental conditions were investigated in detail, including the selection of measuring wave-length and catalytic reactive medium, the dosage of indicator and oxidizer, the influence of temperature and reactive time, and the interference of co-existent ions with the assay. The results showed that, the linear responses of nitrite and nitrate are in the ranges of 0-200 and 0.003-310 micrograms.L-1 respectively. The method offers the advantages of simplicity, rapidity and sensitivity. It has been applied to analyse water samples with satisfactory results.
Keywords:Nitrate  Nitrite  Column of cadmium  Catalytic spectrophotometry
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