用分光光度法测定气体中硝基苯方法的改进

Improvement of Method Using Spectrophotometry to Determine Content of Nitrobenzene in Air

针对目前硝基苯分析方法存在的问题,提出了利用乙醇溶液吸收空气中的硝基苯,还原成苯胺,再经重氮化与盐酸萘乙二胺偶合,能生成紫色化合物,以比色法测定环境空气与工业污染源排放废气中硝基苯的方法。该方法具有操作简便,灵敏度和准确度高,重现性好,线性范围较宽等优点,可满足环境影响评价和建设项目竣工环境保护验收要求的需要。

In view of the problems existed in present nitrobenzene analytical method, the paper puts forward a method that nitmbenzene in air absorbed by ethanol solution would be reduced to aniline, which, after coupling of diazotization with hydrochloric acid naphthol ethylene diamine, generates the purple compound, which can be used to determine content of nitrobenzene in air and waste gas discharged by industrial pollution source with colorimetric procedure. The method is easy to operate, of high sensitiveness and accuracy degree, good reproducibility, and wider linear range, which fully meet the requirement for environmental impact assessment and environmental check of construction projects.