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Flow-injection sample preparation for organotin speciation analysis of water by capillary gas-chromatography microwave-induced plasma-atomic emission-spectrometry
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| Abstract |
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| A semi-automated flow-injection system was developed for on-line sample preparation for the determination of mono-, di- and tributyl- and -phenyltin compounds in water. The procedure is based on the preconcentration of ionic organotin compounds by sorption on bonded silica with octadecyl functional groups followed by on-column ethylation using sodium tetraethylborate. The derivatized species are eluted with 250 mul of methanol, separated by gas chromatography and detected with a microwave-induced plasma atomic emission detector. Aliquots of 25 mul of the eluate are introduced on to a capillary column using the cool injection technique. The solvent is vented off in the liner before the temperature of the latter is raised to release the analytes. A 10-50-ml water sample is sufficient for the analysis and a detection limit of 0.1 ng l-1 can be obtained. The developed procedure was applied to the determination of organotin compounds in a number of river water samples which were analysed in parallel using a manual liquid-liquid extraction procedure. The results agreed within 10-15% for concentrations of a few ng l-1. | |
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English
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Analytica chimica acta. - Amsterdam |
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| Publication |
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Amsterdam : 1993
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0003-2670
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278:1(1993), p. 99-113
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A1993LF12500013
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