A rapid method for determination of nitrate in soil and plant extracts |
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| Authors: | J. P. Singh |
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| Affiliation: | (1) Division of Crops and Soil Science, Central Potato Research Station, Post Bag-1, 144 003 Jalandhar, India |
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| Abstract: | A rapid colourimetric method of determination of nitrate was modified. Proposed modifications eliminated the use of barium sulphate and introduced diazotization of sulphanilamide by the nitrite ion obtained by the reduction of nitrate and subsequent coupling with N-1-naphthyethelenediamine dihydrochloride. Introduction of filtration in place of centrifugation of coloured solution simplified the procedure. Determinations were highly reproducible with coefficient of variation of 2.2 and 2.9% for soil and plant extracts respectively. |
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| Keywords: | colourimetric diazotization nitrate nitrite reduction filtration |
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