JEQ Journal of Natural Resources and Life Sciences Education
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Published in J Environ Qual 15:255-260 (1986)
© 1986 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Determination of Alkyllead Salts in Runoff, Soils, and Street Dusts Containing High Levels of Lead1

J. S. Blais and W. D. Marshall2

ABSTRACT

The determination of aikyllead salts in environmental samples that contain high levels of inorganic Pb is difficult because of poor recoveries and the formation of artifacts during the isolation and derivatization procedures. A modified procedure has been developed in which alkyllead salts are selectively extracted complexometricaliy from samples which contain up to 1000 mg Pb2+ kg–1. The extracts are butylated and analyzed by gas chromatography-atomic absorption spectroscopy. Re-extraction of the sample with methyl isobutyl ketone-dithizone permits the recovery of Pb2+. This procedure was applied to rainwater runoff, soils, and street dusts from urban environments. Ethyllead salts but not methyllead salts were detected in all samples. Concentrations of these analytes were significantly correlated (P <0.01) with levels of extractable Pb2+ in these samples but not with total Pb.

Key Words: Pb speciation • complexometric extraction • alkyllead concentrations

NOTES

1 Contribution from the Dep. of Food Science and Agricultural Chemistry, Macdonald College, Ste. Anne de Bellevue, Quebec, Canada H9X 1C0. This work was supported by grants (G0316 and A6687) from National Science and Engineering Research Council of Canada.

2 Graduate Assistant and Associate Professor, respectively.

Received for publication November 7, 1985.




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