A modified version of the sodium salicylate method for analysis of wastewater nitrates |
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| Authors: | Dora Scheiner |
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| Affiliation: | Environmental Engineering Laboratories. Technion, Israel Institute of Technology, Haifa, Israel |
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| Abstract: | The German sodium salicylate method for nitrate determination has been modified and improved by utilizing flocculating effect of the preservative HgCl2 (1000 mg 1−1). The method gives highly reproducible results in the range of 0·2–16 mg 1−1 nitrate nitrogen and is applicable for routine analysis of untreated sewage. Interfering substances are chloride ions above 1500 mg 1−1 and nitrite ions above 10 mg 1−1N. The yellow color produced by sodium salicylate with nitrate ions obeys Beer's law and remains stable for several hours. |
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