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Andrei V. Garmay, Oksana V. Monogarova, Kirill
V. Oskolok, Pavel I. Radzikovitskiy
Determination of nitrate in soils by digital
colorimetry
Abstract
Abstract. A
method for determining nitrate in soil by digital colorimetry is proposed. The
developed approach is based on appropriate photometric techniques of nitrate
determination after potassium chloride extraction from soil samples. The
original method of determining nitrate in the form of an azo dye formed by the
azo coupling reaction between 1-naphtylamine and sulfanilamide has been
modified to achieve a higher sensitivity and accuracy of colorimetric
determination. This approach ensures metrological characteristics of the
digital colorimetric technique, close to spectrophotometric. The adequacy of
the proposed method was confirmed by analyzing standard samples and soil
samples collected in districts of the Moscow region.
Key words:
nitrate, soil, digital colorimetry, office flatbed photoscanner
Copyright (C) Chemistry Dept., Moscow State University, 2002
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