Influence of Na, K, Ca and Mg on lead atomization by tungsten coil atomic absorption spectrometry

被引：16

作者：

de Oliveira, PV

Krug, FJ

Silva, MM

Nóbrega, JA

Queiroz, ZF

Rocha, FRP

机构：

[1] Univ Sao Paulo, Inst Quim, BR-05513970 Sao Paulo, Brazil

[2] Univ Sao Paulo, Ctr Energia Nucl Na Agr, BR-13400970 Piracicaba, SP, Brazil

[3] Univ Fed Rio Grande Sul, Dept Quim, BR-91501970 Porto Alegre, RS, Brazil

[4] Univ Fed Sao Carlos, Dept Quim, BR-13565905 Sao Carlos, SP, Brazil

[5] Univ Sao Paulo, Inst Quim Sao Carlos, BR-13560970 Sao Carlos, SP, Brazil

来源：

JOURNAL OF THE BRAZILIAN CHEMICAL SOCIETY | 2000年 / 11卷 / 02期

关键词：

lead atomization; atomic absorption spectrometry; tungsten coil atomizer; interference;

D O I：

10.1590/S0103-50532000000200006

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The atomization of lead in an electrothermal tungsten coil atomizer in the presence and absence of Na+, K+, Ca2+ and Mg2+ was investigated with the objective of understanding the interference processes. The lead atomization was less affected by Ca2+ and Mg2+ than by Na+ and K+. In the absence of concomitants, lead atomization efficiency was improved by the presence of H-2 (10% v/v) in the purge gas composition, during pyrolysis and atomization steps. The interference caused by Na+ and Ca2+ was negligible when the pyrolysis step was accomplished without H-2 in the purge gas composition The results showed that Na+, K+, Ca2+ and Mg2+ are directly involved in competition reactions for H-2 in condensed phase.

引用

页码：136 / 142

页数：7

共 30 条

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