1993 Volume 9 Issue 1 Pages 105-109
For electrothermal sample introduction, a commercially available tungsten boat atomizer for atomic absorption spectrometry was transformed to a vaporizer for inductively coupled plasma atomic emission spectrometry. By placing diammonium hydrogenphosphate in the boat as a matrix modifier prior to analysis, the loss of cadmium and lead which would occur during the ashing stage was suppressed. With this method, an enhancement in cadmium sensitivity and no severe interference from foreign ions was observed. The detection limits (3σ) for cadmium and lead were 0.28 and 2.8ng ml-1, respectively. The relative standard deviations for 7 replicate determinations were 7.9% for 2ng ml-1 of cadmium and 3.4% for 20ng ml-1 of lead. The calibration graphs were linear in the tested range of up to 10μg ml-1 for both elements. Analytical results of some biological and environmental samples are given.
