Journal
JOURNAL OF THE BRAZILIAN CHEMICAL SOCIETY
Volume 11, Issue 2, Pages 136-142Publisher
SOC BRASILEIRA QUIMICA
DOI: 10.1590/S0103-50532000000200006
Keywords
lead atomization; atomic absorption spectrometry; tungsten coil atomizer; interference
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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.
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