Extraction-photometric selective determination of trace perchlorates in potable waters |
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| Authors: | E V Elipasheva A S Kamasheva P N Kulikov G M Sergeev |
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| Institution: | 19913. Department of Chemistry, Lobachevsky Nizhni Novgorod State University, pr. Gagarina 23, Nizhni Novgorod, GSP-20, 603950, Russia
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| Abstract: | A method is proposed for the selective photometry determination of perchlorates in potable water with a detection limit of 2×10?3 mg/L is proposed based on the extraction of its ion pair with the astrafloxin cation and absorbance measurements at 540 nm. The following ratios of matrix ions are acceptable (in parentheses): ClO?, ClO 2 ? , ClO 3 ? , BrO 3 ? (500); I? (1000); IO 3 ? (7000); HCO 3 ? , Cl?,SO 4 2? , NO 3 ? , Br?, Na+, K+, Ca2+, Mg2+ (10000). The relative error of determination for ClO 4 ? is 20% in the range 4 × 10-3-1 × 10?2 mg/L and 10% in the range 1 × 10-2–5 × 10?2 mg/L. |
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