![]() ![]() ![]() Moreover, a two-step procedure was proposed to determine copper and lead mixtures, through the reaction of two increments of a mixture with phenylfluorone and Zephiramine at pH 9.0☐.1, in both the absence and presence of thiourea as a selective masking agent for copper. The developed methods were successfully applied to determine copper and lead in some double-base propellants. Beer′s law was obeyed up to 0.42ppm of copper and 1.96ppm of lead at 562nm. with molar absorptivities of 9.3×104 and 6.2×104M-1 cm-1, respectively. The sensitized 1:2 copper- and lead-phenylfluorone chelates were formed within the pH ranges 8.8-9.8 and 8.8-9.5. Maximum sensitization of the color reactions was obtained in the presence of benzyldimethyltetradecylammonium chloride (Zephiramine). ![]() The complexation reactions of copper(II) and lead(II) with phenylfluorone in aqueous micellar solutions of different surfactants were investigated. ![]()
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December 2022
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