Issue 2, 1993

Direct determination of cadmium in sea-water by electrothermal atomic absorption spectrometry with sodium hydroxide as a chemical modifier

Abstract

The use of sodium hydroxide as a chemical modifier for the direct determination of trace amounts of cadmium in sea-water by electrothermal atomic absorption spectrometry is described. It permits a selected ashing temperature up to 1400 °C and markedly reduces the background signal caused by high sea-salt contents, while the ashing time is prolonged up to 100 s. Colloidal magnesium hydroxide precipitates were produced by the addition of NaOH modifier to sea-water, and trace amounts of cadmium were considered to be coprecipitated with magnesium hydroxide. The proposed method was used for the direct determination of cadmium in open ocean sea-water. The validity of the procedure was checked with two certified reference sea-waters (CASS-1 and CASS-2) and the results were found to be in good agreement with the certified values. A detection limit of 0.015 ng ml–1 was obtained for 80 µl injections.

Article information

Article type
Paper

Analyst, 1993,118, 189-192

Direct determination of cadmium in sea-water by electrothermal atomic absorption spectrometry with sodium hydroxide as a chemical modifier

C. Lan, Analyst, 1993, 118, 189 DOI: 10.1039/AN9931800189

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