Abstract
A tissue solubilizer is used to dissolve biological samples without altering the chemical forms of the alkyllead species. The various alkyllead species and lead(II) are isolated quantitatively by chelation extraction with sodium diethyldithlocarbamate, followed by n-butylation to their corresponding tetraalkyl forms, R/sub n/PbBu/sub (4-n)/, and Bu/sub 4/Pb, respectively (R = Me, Et), all of which can be determined by a GC/AAS (gas chromatography/atomic absorption spectrometry) method. The method determines simultaneously the following species in one sample: tetraalkyllead (Me/sub 4/Pb, Me/sub 3/EtPb, Me/sub 2/Et/sub 2/Pb, MeEt/sub 3/Pb, Et/sub 4/Pb); ionic alkyllead (Me/sub 2/Pb/sup 2 +/, Et/sub 2/Pb/sup 2 +/, Me/sub 3/Pb/sup +/, Et/sub 3/Pb/sup +/); Pb/sup 2 +/. Analyses of sediment, fish, and aquatic weeds are given. Detection limits expressed for Pb are 7.5 ng/g and 15 ng/g, respectively, for biological and sediment samples.
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