Fully automatic on-line separation preconcentration system for electrothermal atomic absorption spectrometry : Determination of cadmium and lead in sea-water

An automatic separation preconcentration system coupled to an electrothermal (graphite furnace) atomic absorption spectrometer is described. The preconcentration step is performed on a chelating resin microcolumn (Chelex-100) placed in the injection tip of the autosampler. A time based manifold with...

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Bibliographic Details
Published in:Analyst (London) 1997, Vol.122 (7), p.679-684
Main Authors: FERNANDEZ, F. M, STRIPEIKIS, J. D, TUDINO, M. B, TROCCOLI, O. E
Format: Article
Language:English
Subjects:
Analytical chemistry
Cadmium - analysis
Chemistry
Electronic Data Processing
Exact sciences and technology
Lead - analysis
Seawater - chemistry
Sensitivity and Specificity
Spectrometric and optical methods
Spectrophotometry, Atomic
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Summary:An automatic separation preconcentration system coupled to an electrothermal (graphite furnace) atomic absorption spectrometer is described. The preconcentration step is performed on a chelating resin microcolumn (Chelex-100) placed in the injection tip of the autosampler. A time based manifold with two- and three-way solenoid valves commanded by an eight channel microcomputer programmable controller is used for column conditioning, preconcentration and washing steps; no manual operations are involved. Elution is performed by the programmable graphite furnace autosampler and achieved in only one step. Operations involving complete and partial injection of the eluate into the graphite furnace are also discussed. The system was applied to the determination of Cd and Pb in near shore sea-water from Patagonia, Argentina. Detection limits of 1 and 8 ng l-1 were obtained for Cd and Pb respectively. Analysis of a certified reference material (CASS-3) showed good agreement with the certified values.
ISSN:0003-2654
1364-5528
DOI:10.1039/a607598c