Abstract
Optimal conditions for the complexation of nickel(II) with 1-nitroso-2-naphthol-3,6-disulfonic acid were found using the spectrophotometric method. The optimal pH interval for complexation was 7.2–8.8 with a fivefold excess of the reagent. The stoichiometric Me: R composition was 1: 2. The molar absorption coefficient and colorimetric characteristics of the complex were determined in the nickel(II) concentration range of (4.09–16.35) × 10−5 M. The molar absorption coefficient was (7.52 ± 0.05) × 103 (n = 10, P = 0.95). The most sensitive chromaticity functions were B [(1.83 ± 0.04) × 105] and G [(1.76 ± 0.05) × 105] (n = 9, P = 0.95).
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