Catalytic Determination of Cobalt in Liver by Flow-Injection Spectrophotometry

被引：14

作者：

Arruda, M. A. Z. ^{[1
]}

Zagatto, E. A. G. ^{[1
]}

Jacinth, A. O. ^{[1
]}

Brienza, S. M. B. ^{[1
]}

机构：

[1] Univ S Paulo, Ctr Energia Nucl Agr, BR-13400 Piracicaba, SP, Brazil

来源：

JOURNAL OF THE BRAZILIAN CHEMICAL SOCIETY | 1991年 / 2卷 / 01期

关键词：

catalysis; flow-injection; cobalt; liver;

D O I：

10.5935/0103-5053.19910009

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

A flow -injection procedure is proposed for the catalytic spectrophotometric determination of cobalt in liver. The method exploits the catalysis of this metal on Tiron oxidation by hydrogen peroxide in alkaline medium. Influence of pH, reagent concentrations, temperature, ionic strength, flow rates, feasibility of kinetic discrimination and presence of potential interfering ions were studied. With a sampling rate of about 40 samples per hour, the system yields precise results (r.s.d. usually < 1% within the 0.20 2.00 pg Co 1'1 range) in agreement with graphite furnace atomic absorption spectrometry. The detection limit is 2 ng Co 1-' and the consumption of Tiron is only 0.13 mg per sample. Additional procedures for selectivity enhancement are suggested.

引用

页码：47 / 50

页数：4

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