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Spectrophotometric determination of nitrite in polluted waters using 3-nitroaniline

✍ Scribed by H.P.S. Rathore; S.K. Tiwari

Publisher: Elsevier Science
Year: 1991
Tongue: English
Weight: 273 KB
Volume: 242
Category: Article
ISSN: 0003-2670
DOI: 10.1016/0003-2670(91)87068-i

No coin nor oath required. For personal study only.

✦ Synopsis

Nitrite reacts with 3-nitroaniline in the presence of hydrochloric acid to form a diazonium cation, which is subsequently coupled with N-(1-naphtyl)ethylenediammonium chloride to form a stable purple azo dye. The method is suitable for the determination of 0.01-0.80 pg ml-' nitrite. The reactions are very fast and require no control of temperature.

The observed molar absorptivity and Sandell's sensitivity of the azo dye are 4.9 x lo4 1 mol-' cm-' and 9.4 X 10m4 ng cm-*, respectively.

The method is free from most interferences. The method has been applied successfully to polluted river water.

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