Direct determination of cadmium in sea-water using electrothermal atomization atomic absorption spectrometry with Zeeman-effect background correction and oxalic acid as a chemical modifier
- 1 January 1992
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of Analytical Atomic Spectrometry
- Vol. 7 (2) , 383-388
- https://doi.org/10.1039/ja9920700383
Abstract
A method for the determination of cadmium in sea-water using an electrothermal atomization atomic absorption spectrometry system with Zeeman-effect background correction is presented. The effect of various inorganic and organic acids, used as chemical modifiers, on the atomization of cadmium and the sea-water background absorption signals were examined. Of all the different modifiers studied, oxalic acid suppresses chloride interference, promotes a lower atomization temperature and does not introduce any simultaneous significant background absorption signal, and was therefore of particular interest. Optimization of the experimental conditions gave a characteristic mass of 0.23 pg. For an injection of 99 µl of sea-water into the furnace, the detection limit was 3 ng l–1.Keywords
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