Highly sensitive spectrophotometric determination of trace amounts of platinum(IV) with the molybdate-basic dyes-poly(vinyl alcohol) system |
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Authors: | Zubi Li Jialin Wang Qiheng Xu |
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Affiliation: | (1) Adult Education College, Yunnan University, 650 091 Kunming, Peoples Republic of China;(2) Department of Chemistry, Yunnan University, Kunming, Peoples Republic of China |
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Abstract: | Three highly sensitive spectrophotometric methods for the determination of platinum(IV) have been developed, based on its colour reactions with molybdate and basic dyes (BD) in aqueous solution in the presence of poly(vinyl alcohol). Platinum(IV) reacts with molybdate and BD to form ion — association complexes of composition (BD)2[Pt (MoO4)3]. The molar absorptivities are between 6.83 × 105 and 9.51 × 105 dm3mol–1cm–1, the highest value being found with nile blue. Suitable conditions for the reactions and the effects of foreign ions were investigated. The methods can be applied to the spectrophotometric determination of trace amounts of platinum(IV) in some catalysts and ores. |
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Keywords: | platinum(IV) determination spectrophotometry molybdate-basic dyes-polyvinyl alcohol system nile blue butyl rhodamine B |
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