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A spot test for nitrates

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Summary

At a dilution of 1:200.000, and in the presence of excess sulfuric acid, as little as 0.2 μg nitrate ion forms a yellow color with chroniotropic acid. Interfering colors due to nitrites and oxidizing agents are eliminated by previous treatment of the test sample with sodium sulfite, sulfuric acid, and sulfamic acid.

Zusammenfassung

Bis zu einer Verdünnung von 1 ∶ 200000 geben noch 0,2 μg Nitration bei Gegenwart überschüssiger Schwefelsäure mit Chromotropsäure eine gelbe Farbe. Störende Farbreaktionen durch Nitrit und andere Oxydationsmittel lassen sich durch vorhergehende Behandlung der Probe mit Natriumsulfit, Schwefelsäure und Amidosulfonsäure ausschalten.

Résumé

En quantités de l'ordre de grandeur de 0,2μg, à une dilution de 1 ∶ 200000 et en présence d'un excès d'acide sulfurique, les ions nitrate donnent une coloration jaune avec l'acide chromotropique. Les colorations gênantes dûes aux nitrites et aux réactifs oxydants sont éliminées par un traitement préalable de l'échantillon à examiner à l'aide de sulfite de sodium et des acides sulfurique et sulfamique.

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Authors and Affiliations

  1. Coates Chemical Laboratories Louisiana State University, Baton Rouge

    Philip W. West & P. L. Sarma

Authors
  1. Philip W. West
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  2. P. L. Sarma
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Additional information

Dedicated to Prof.Hans Lieb on occasion of his 70th birthday.

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West, P.W., Sarma, P.L. A spot test for nitrates. Mikrochim Acta 45, 506–509 (1957). https://doi.org/10.1007/BF01257292

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  • DOI: https://doi.org/10.1007/BF01257292

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