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UNSPECIFIED (2010) A simple and sensitive spectrophotometric method for the determination of trace amounts of nitrite in environmental and biological samples using 4-amino-5-hydroxynaphthalene-2,7-disulphonic acid monosodium salt. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 75 (5). 1411 - 1416. ISSN 1873-3557