分析化学2011，Vol.39Issue(6)：943-944,2.DOI:10.3724/SP.J.1096.2011.00943
反相流动注射-紫外光还原-分光光度法测定饮用水中的硝酸盐
Reversed Flow Injection Analysis of Nitrate in Drinking Water with UV-induced Reduction to Nitrite and Spectrophotometric Detection
摘要
Abstract
An environmental friendly method was developed based on reversed flow injection (r-FIA) with UV-induced reduction of nitrate to nitrite and spectrophotometric detection. Sample or standard solutions were mixed with a phosphate buffer solution containing diethylenetriaminepentaacetate (DTPA), and then passed through a UV reduction reactor equipped with an 8 W low pressure mercury lamp, where the nitrate was reduced to nitrite. The formed nitrite was detected with spectrophotometric method through Griess reaction. Less than 20 μmol/L of nitrite showed no effect on the nitrate analysis. Reduction efficiency over 80％ was obtained. The detection limit of the proposed method was 0. 053 μmol/L and linear range was 0.2-40 μmol/L. A sample of 20 μmol/L nitrate was continually measured for 48 times, and a RSD of 2.22％ was obtained. The recoveries of drinking waters were between 90. 9 ％- 100.6 ％.关键词
Nitrate/ ultraviolet-induced reduction/ Flow injection/ SpectrophotometryKey words
Nitrate/ ultraviolet-induced reduction/ Flow injection/ Spectrophotometry引用本文复制引用
张敏,袁东星,冯思超,黄勇明..反相流动注射-紫外光还原-分光光度法测定饮用水中的硝酸盐[J].分析化学,2011,39(6):943-944,2.基金项目
本文系国家"863"项目(No.2007AA061501)和"长江学者和创新团队发展"计划(No.40821063)资助项目. （No.2007AA061501）
