Wall-to-platform migration in electrothermal atomic absorption spectrometry Part 1. Investigation of the mechanism of chloride interference on thallium

摘要: Abstract In wall-to-platform migration, the sample aliquot is pipetted onto graphite furnace wall. Heating of then causes migration analyte from wall to platform. This technique permitted atomic absorption signal for 1 ng thallium be separated in time background 10 μg a sodium chloride matrix. precluded interference through gas-phase reaction or expulsion loss analyte, since they would require and matrix present gas phase at same time. Hence, it was concluded that by occurred condensed phase. A refinement called “two-platform method”, an examination temperature dependence platform, hence stage heating when occurred. showed between condensed-phase species, temperatures 500 700°C, during pyrolysis cycle.