Direct determination of trace metals in sea-water by inductively coupled plasma mass spectrometry

An inductively coupled plasma MS method for the direct determination of trace metals in seawater without a preconcentration or separation step was developed. Sample introduction was based on flow injection analysis (FIA) or electrothermal vaporization (ETV). FIA-ICP-MS was used for the determination...

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Bibliographic Details
Published in:Journal of analytical atomic spectrometry 1998, Vol.13 (11), p.1239-1244
Main Authors: ROSLAND, E, LUND, W
Format: Article
Language:English
Subjects:
Analytical chemistry
Applied sciences
Chemistry
Exact sciences and technology
Natural water pollution
Pollution
Seawaters, estuaries
Spectrometric and optical methods
Water treatment and pollution
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Summary:An inductively coupled plasma MS method for the direct determination of trace metals in seawater without a preconcentration or separation step was developed. Sample introduction was based on flow injection analysis (FIA) or electrothermal vaporization (ETV). FIA-ICP-MS was used for the determination of manganese, molybdenum and uranium; a 500 ul sample of 10-fold diluted seawater was injected into 0.028 mol per litre nitric acid as the carrier. The detection limits were relatively poor: 0.7 ug per litre for manganese; 1.4 ug per litre for molybdenum; and 0.10 ug per litre for uranium. ETV-ICP-MS was used for the determination of cadmium and lead. The metals were vaporized as chlorides at 800C without interference from matrix elements. The detection limits were 4.1 and 0.8 ng per litre, respectively. No chemical modifier was required. The methods were validated by the analysis of the reference seawater sample NASS4; results for all 5 elements were in agreement with certified values.
ISSN:0267-9477
1364-5544
DOI:10.1039/a804350g