Sensitive method for determination of lead by potassium dichromate-lactic acid hydride generation inductively coupled plasma atomic emission spectrometry

The ability of the potassium dichromate-lactic acid system (for the generation of plumbane) to enhance the analytical performance of continuous HG-ICP-AES techniques for the determination of lead, was examined. The mixture of potassium dichromate and lactic acid resulted in higher sensitivity, good...

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Published in:Journal of analytical atomic spectrometry 1993, Vol.8 (6), p.821-825
Main Authors: VALDES-HEVIA Y TEMPRANO, M. C, FERNANDEZ DE LA CAMPA, M. R, SANZ-MEDEL, A
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Language:English
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Biological and medical sciences
General aspects. Methods
Medical sciences
Toxicology
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FERNANDEZ DE LA CAMPA, M. R
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description The ability of the potassium dichromate-lactic acid system (for the generation of plumbane) to enhance the analytical performance of continuous HG-ICP-AES techniques for the determination of lead, was examined. The mixture of potassium dichromate and lactic acid resulted in higher sensitivity, good precision (1.3 per cent at 50 ng per ml level) and low interference characteristics. This was attributed to enhanced kinetics and efficiency of plumbane generation. The detection limit of the ICP-AES determination of lead in water with hydride generation using this procedure was 2 ppb, which compared favourably with other HG-ICP-AES techniques using ammonium persulphate-nitric acid (13 ppb) or with added CTAB surfactant (9 ppb). The proposed method was applied to the determination of lead at low levels in soft drinks, sediments and lichens. The results were in good agreement with certified or expected values.
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subjects Biological and medical sciences
General aspects. Methods
Medical sciences
Toxicology
title Sensitive method for determination of lead by potassium dichromate-lactic acid hydride generation inductively coupled plasma atomic emission spectrometry
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