Abstract：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 4.63×104 L·mol-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.
俞芸,施文健*,杨凝非. 磺胺-N-苯基J酸分光光度法测定亚硝酸盐研究[J]. 光谱学与光谱分析, 2007, 27(03): 573-576.
YU Yun, SHI Wen-jian*,YANG Ning-fei. Study and Spectrophotometric Determination of Nitrite with Sulfanilamide and N-Phenyl J-Acid System . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2007, 27(03): 573-576.
