SPECTROPHOTOMETRIC DETERMINATION OF ZINC IN COPPER-BASE ALLOYS WITH TAN

被引：10

作者：

FERREIRA, SLC

ARAUJO, NML

SANTOS, AB

DANTAS, AF

COSTA, ACS

机构：

[1] Instituto de Química, Campus Universitário da Federação, Universidade Federal da Bahia, Salvador, Bahia

来源：

MIKROCHIMICA ACTA | 1995年 / 118卷 / 1-2期

关键词：

ZINC; 1-(2-THIAZOLYLAZO)-2-NAPHTHOL; SPECTROPHOTOMETRY; DERIVATIVE SPECTROPHOTOMETRY; COPPER BASE ALLOYS;

D O I：

10.1007/BF01242235

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

TAN reacts with zinc(II) forming a red complex with composition 1:2 Zn(II)-TAN and absorption maximum at 582 nm. Zinc can be determined with this reagent in the presence of Triton X-100, in the pH range 6.20-8.00 with a molar absorptivity of 4.5 x 10(4) l/mol/cm Beer's Law was obeyed up to least 1.55 mu g/ml. Copper interference was eliminated with a mixture of thiosulfate and ascorbic acid and nickel separated by precipitation with dimethylglyoxime. The proposed method was used for zinc determination in several copper-base alloys and the results of analysis in comparison with certified values indicated that the procedure was accurate and precise. A derivative procedure is also proposed, allowing zinc determination with high sensitivity (5-400 ng/ml).

引用

页码：123 / 129

页数：7

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[2]

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[3]

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