Decolorization Reactions Between Chromium (VI) and Three Colour Reagents. Determination of Chromium (VI) by Flow Injection Analysis
作者:
Chen Xingguo,
Xu Yanjun,
Hu Zhide,
期刊:
Analytical Letters
(Taylor Available online 1993)
卷期:
Volume 26,
issue 3
页码: 605-612
ISSN:0003-2719
年代: 1993
DOI:10.1080/00032719308016821
出版商: Taylor & Francis Group
关键词: Decolorization reaction;Chromium;Flow injection analysis (FIA)
数据来源: Taylor
摘要:
Chromium (VI) can oxidize and decolor three colour reagents, i.e. 1,8-dihydroxy-2-(4′-chloro-2′-phosphonophenylazo)-7-(6″.8″-disulfonaphthylazo)-3,6-disulfonaphthalene (RI): 1,8-dihydroxy-2-(4′-chloro-2′-phosphonophenylazo)-7-(4″-sulfonamidephenylazo)-3,6-disulfonaphthalene (RII): and 1,8-dihydroxy-2-(4′-chloro-2′-phosphonophenylazo)-7-(p-hippuric acid azo)-3,6-disulfonaphthalene (RIII). Loss of absorbance of three colour reagents at maximum absorption wavelengths is proportional to the concentration of chromium (VI) in solution. We have made use of the decolorization reactions between chromium (VI) and three colour reagents to determine chromium in steel by flow injection analysis, and relative error in sample determination is less than 5.0%. Response is linear from 0.84 to 6.72 μg/mL and optimum measuring acidity is 1.3–1.7 mol/L H2SO4in three systems. The effect of interference ions on determination has been studied.
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