Determination of Cadmium and Lead in Sea Water after Extraction Using Electrothermal Atomisation. Minimisation of Interferences from Co-Extracted Sea Salts
作者:
Monika Bengtsson,
Lars-Goran Danielsson,
Bertil Magnusson,
期刊:
Analytical Letters
(Taylor Available online 1979)
卷期:
Volume 12,
issue 13
页码: 1367-1384
ISSN:0003-2719
年代: 1979
DOI:10.1080/00032717908067927
出版商: Taylor & Francis Group
关键词: Cadmium;lead;sea water;extraction;electrothermal atomisation;atomic absorption;matrix modification;lanthanum.
数据来源: Taylor
摘要:
Interferences from small amounts of sea salt in the determination of cadmium and lead were investigated. Test samples were made to mimic solutions obtained after extraction of sea water for trace metal analysis. Sea salt concentrations in the range 0–400 mg/l were investigated. Background absorption from this salt was high but easily minimised through the addition of nitric acid (2 % v/v). Sensitivity reductions due to the salt were considerable and varied from one graphite tube to the other. This problem was overcome by the addition of 1000 mg lanthanum per litre of sample. The positive effect of the lanthanum matrix modification is thought to be due to a change of the graphite tube surface.
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