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Vol. 33 No. 4 (2021): Vol 33 Issue 4

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Speciation Study of Nitrite/Nitrate through Diazo-Coupling Reaction Using Silica-Perchloric Acid as a Novel Catalyst at Trace Level: Application to Environmental Samples

https://doi.org/10.14233/ajchem.2021.23107
Narayanamma Chinna Adeppagari
Department of Chemistry, Bangalore University, Bengaluru-560056, India
Nayana Kudluru Omkarappa
Department of Chemistry, Bangalore University, Bengaluru-560056, India
Pandurangappa Malingappa
Department of Chemistry, Bangalore City University, Bengaluru-560001, India

Corresponding Author(s) : Pandurangappa Malingappa

mprangachem@gmail.com

Asian Journal of Chemistry, Vol. 33 No. 4 (2021): Vol 33 Issue 4

Abstract

A simple, sensitive and rapid spectrophotometric method has been developed based on the diazo coupling reaction in the quantification of nitrite/nitrate at trace level using silica perchloric acid (SPCA) as an acid catalyst. 5-Amino-2-mercapto benzimidazole has been used as a novel amine and coupled with N-(1-naphthyl)ethylenediamine dihydrochloride (NEDA) to produce an intense coloured azo dye. The proposed method showed wide linearity in the concentration range 0.1-1000 ppm of nitrite. The molar absorptivity and Sandell′s sensitivity were found to be 1.6 × 106 L mol–1 cm–1 and 0.0012 μg cm–2 respectively. Nitrate was measured after its reduction to nitrite using optimized copper-cadmium reductor column. The proposed method has been successfully applied to measure trace level nitrite/nitrate from a variety of sample matrices like water, soil, milk and radiator coolant.

Keywords

Silica perchloric acid 5-Amino-2-mercaptobenzimidazole Nitrate Nitrite Diazo-coupling reaction
Chinna Adeppagari, N., Kudluru Omkarappa, N., & Malingappa, P. (2021). Speciation Study of Nitrite/Nitrate through Diazo-Coupling Reaction Using Silica-Perchloric Acid as a Novel Catalyst at Trace Level: Application to Environmental Samples. Asian Journal of Chemistry, 33(4), 819–826. https://doi.org/10.14233/ajchem.2021.23107
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