摘要
筛选了重氮组分和偶合组分。研究了重氮偶合显色反应的条件和方法，提出了借助于磺胺-J酸系列染料中间体（N-苯基J酸、J酸、双J酸）重氮偶合技术分光光度法测定亚硝酸盐。在常温溴化钾共存下，亚硝酸盐在稀盐酸溶液中与磺胺发生重氮化反应，在碳酸钠水溶液中重氮盐与J酸系列染料中间体偶合生成有色偶氮化合物。磺胺-N-苯基J酸偶氮化合物的表观摩尔吸光系数为4．63×10^4L·ml^-1·cm^-1，线性范围为0．003-0．7mg·L^-1，回收率为99．5％～101．6％。相对标准偏差为2．10％。该本方法可用于环境水体中痕量亚硝酸盐的测定。
In the present article, compounds used in diazotizing-coupling reaction were selected. The conditions and methods of diazotizing-coupling chromogenic reaction were studied. A new method of diazotizing-coupling spectrophotometry with sulfanilamide（p-aminobenzene sulfonamide） and J-Acid series dye intermediates （N-phenyl J-Acid, J-Acid, Di-J-Acid） to determine nitrite was developed. At room temperature, in the presence of potassium bromide, nitrous acid reacted with sulfanilamide in the medium of thin hydrochloric acid. Then diazonium salt reacted with N-phenyl J-Acid in the aqueous solution of sodium carbonate, forming coloured azo compounds. The apparent molar absorptivity was 4.63×10^4L·ml^-1·cm^-1 The Beer＇s law was obeyed in the range of 0. 003-0. 7 mg · L^-1. The recoveries were in the range of 99. 5%-101.6%. RSD was 2.1%. This method has been used for the determination of trace nitrite in the environmental water.
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
2007年第3期573-576,共4页
Spectroscopy and Spectral Analysis
基金
国家自然科学基金项目(70371011)
上海市教育委员会自然科学基金项目(05EZ05)资助
