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A Sensitive, Specific Method for the Determination of Tetraalkyllead Compounds in Air by Gas Chromatography/atomic Absorption Spectrometry by C.N. Hewitt; Roy M. Harrison is a Chemistry article available to read on EtoBox.

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The development of a sensitive and specific method of determining individually the five tetraalkyllead compounds normally present in ambient air is described. The method is based on collection of the analytes on a porous polymer using a prefilter to destroy ozone and prevent decomposition of the sample during collection and storage. Two-stage thermal desorption, separation by gas chromatography and detection by modified flame atomic absorption spectrometry gives detection limits (30) of ca. 0.25 ng Pb me3 for tetramethyllead and 0.37 ng Pb mm3 for tetraethyllead in an air sample of 80 dm" collected over a 3-24 h period. Environmental sampling by this method in parallel with a wet chemical (iodine monochloride) method was used to validate the method. During the comparative study, higher organic lead levels were consistently found by the iodine monochloride method; it is postulated that this indicates the presence of vapour-phase tri-(or di)-alkyllead in excess of 1 ng Pb m" in rural air. The versatility of the method is demonstrated by the results of atmospheric sampling at two locations, one rural and one at the kerbside in a city centre.

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Author

C.N. Hewitt; Roy M. Harrison

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0003-2670)

Published

1985

Language

EN

Field

Chemistry (Physical Sciences)