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

• Autor(a) principal: Oliveira,Pedro V. de
• Data de Publicação: 2000
• Outros Autores: Krug,Francisco J., Silva,Márcia M., Nóbrega,Joaquim A., Queiroz,Zilvanir F., Rocha,Fábio R. P.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Journal of the Brazilian Chemical Society (Online)
• Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532000000200006
• topic: lead atomization; atomic absorption spectrometry; tungsten coil atomizer; interference

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 H2 (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 H2 in the purge gas composition. The results showed that Na+, K+, Ca2+ and Mg2+ are directly involved in competition reactions for H2 in condensed phase.