光谱学与光谱分析 |
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Study and Spectrophotometric Determination of Nitrite with Sulfanilamide and N-Phenyl J-Acid System |
YU Yun, SHI Wen-jian*,YANG Ning-fei |
College of Urban Construction, University of Shanghai for Science and Technology, Shanghai 200093, China |
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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.
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Received: 2005-12-26
Accepted: 2006-04-16
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Corresponding Authors:
SHI Wen-jian
E-mail: swj1957@msn.com
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Cite this article: |
YU Yun,SHI Wen-jian,YANG Ning-fei. Study and Spectrophotometric Determination of Nitrite with Sulfanilamide and N-Phenyl J-Acid System [J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2007, 27(03): 573-576.
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URL: |
https://www.gpxygpfx.com/EN/Y2007/V27/I03/573 |
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