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- W1969953721 abstract "Abstract An improved rapid method of extraction-photometric determination of trace amounts of nitrate and nitrite in water has been developed. In this method, nitrate is quickly reduced to nitrite at pH 3.0 in 5 min with freshly prepared cadmium sponge, which is produced in situ by action of zinc powder in dilute solution of cadmium chloride in presence of ammonium chloride. At pH 2.0, nitrous acid diazotizes with p-amino-acetophenone, which is then coupled with N-(1-naphthyl)-ethylenediamine. The azodye formed is extracted into n-butanol at pH 2.0 in the presence of β-naphthyl sulfonic acid and aluminium nitrate. The absorbance is measured at 550 nm. The molar absorptivity of the extract is about 4.8 × 104 1 · mol−1 · cm−1. The ions normally present in water do not interfere when sodium metaphosphate is added as a masking agent. Water from several sources has been analyzed by this method, and results found are satisfactory." @default.
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- W1969953721 date "1983-07-01" @default.
- W1969953721 modified "2023-10-18" @default.
- W1969953721 title "Improvement of Photometric Determination of Trace Amounts of Nitrate and Nitrite in Water" @default.
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- W1969953721 doi "https://doi.org/10.1080/03067318308071918" @default.
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