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1985•Acta Chimica SinicaRequires access

RESEARCH ON COLOUR REACTION BETWEEN BISMUTH (III) AND THIAZOLYLAZO-DERIVATIVE

Gao J, X Wang

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Abstract

A new chromogenic reagent, 2-(4, 5-dimethylthiazolylazo)-5-diethyl aminophenol, DMTAE, has been synthesized by coupling of 2-amino-4, 5-dimethylthiazole with mdialkylaminophenol. The blue complex formed between Bi(Ⅲ) and DMTAE at pH2.8(potassium biphthalate buffer solution) has been investigated. Molar absorptivity is 1.0×10~5L·mol~(-1)·cm~(-1) at λ_(max) 590nm. The analytical specificity is K_(a_1)=7.6×10~(-2), K_(a_2)=1.0×10~(-7). The composition of complex as determination by a variety of methods is Bi(Ⅲ): DMTAE(1:2). The apparent stability constant calculated is 2.9×10~9. A highly sensitive method for spectrophotometric determination of mieroquantity of bismuth has been developed, which is suitable for the determination of mioroamounts of bismuth in tool steel, bronze, copper alloy, waste water and tap water.

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A new chromogenic reagent, 2-(4, 5-dimethylthiazolylazo)-5-diethyl aminophenol, DMTAE, has been synthesized by coupling of 2-amino-4, 5-dimethylthiazole with mdialkylaminophenol. The blue complex formed between Bi(Ⅲ) and DMTAE at pH2.8(potassium biphthalate buffer solution) has been investigated. Molar absorptivity is 1.0×10~5L·mol~(-1)·cm~(-1) at λ_(max) 590nm. The analytical specificity is K_(a_1)=7.6×10~(-2), K_(a_2)=1.0×10~(-7). The composition of complex as determination by a variety of methods is Bi(Ⅲ): DMTAE(1:2). The apparent stability constant calculated is 2.9×10~9. A highly sensitive method for spectrophotometric determination of mieroquantity of bismuth has been developed, which is suitable for the determination of mioroamounts of bismuth in tool steel, bronze, copper alloy, waste water and tap water.

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Available abstract

A new chromogenic reagent, 2-(4, 5-dimethylthiazolylazo)-5-diethyl aminophenol, DMTAE, has been synthesized by coupling of 2-amino-4, 5-dimethylthiazole with mdialkylaminophenol. The blue complex formed between Bi(Ⅲ) and DMTAE at pH2.8(potassium biphthalate buffer solution) has been investigated. Molar absorptivity is 1.0×10~5L·mol~(-1)·cm~(-1) at λ_(max) 590nm. The analytical specificity is K_(a_1)=7.6×10~(-2), K_(a_2)=1.0×10~(-7). The composition of complex as determination by a variety of methods is Bi(Ⅲ): DMTAE(1:2). The apparent stability constant calculated is 2.9×10~9. A highly sensitive method for spectrophotometric determination of mieroquantity of bismuth has been developed, which is suitable for the determination of mioroamounts of bismuth in tool steel, bronze, copper alloy, waste water and tap water.

Key concepts: Chemistry, Bismuth, Molar absorptivity, Reagent, Chromogenic, Color reaction, Buffer solution, Copper

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