目前由于工业的迅速发展,水质污染问题日益受到重视。微量硝酸盐和亚硝酸盐等项目的测定,已成为监测水质污染程度的指标。微量硝酸盐和亚硝酸盐在一定条件下可转化为致癌物质,所以对其测定已成为食品、水质污染分析中必不可少的项目。微量硝酸盐和亚硝酸盐的测定方法目前虽然较多,但当二者共存时,至今没有测定NO_3~-的理想方案。本文用置换法制取纯镉,将硝酸盐还原为亚硝酸盐进行测定。在实验条件上比前人有所改进,可获得满意的结果。另外,制药工业和染料工业的废水中,不同程度地含有苯胺、硝酸盐和亚硝酸盐。关于苯胺对硝酸盐、业硝酸盐测定的影响及其消除办法,至今尚无报道。文本测定了其 At present, due to the rapid development of industry, the issue of water pollution is paid more and more attention. Determination of trace nitrite and nitrite, has become an indicator of water pollution monitoring. Trace nitrates and nitrites can be transformed into carcinogens under certain conditions, so the determination of them has become an indispensable item in food and water pollution analysis. Although there are many methods for the determination of trace nitrite and nitrite, there is no ideal scheme for the determination of NO_3 ~ when they coexist. In this paper, pure cadmium prepared by displacement method, the nitrate was reduced to nitrite for determination. In the experimental conditions than previous improvements, can be satisfied with the results. In addition, the pharmaceutical industry and the dye industry wastewater, to varying degrees, contain aniline, nitrate and nitrite. There is no report on the effect of aniline on the determination of nitrates and nitrates and their elimination. Text measured it