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This work was supported financially by the University Grants Commission (U.G.C.), New Delhi.
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Johar, G.S., Tiwari, G.D. Microdetection of nitrite with malachite green or congo red. Z. Anal. Chem. 265, 32 (1973). https://doi.org/10.1007/BF00453185
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DOI: https://doi.org/10.1007/BF00453185