Portal de Periódicos da CAPES

Ionic alkyl‐lead, tetra‐alkyl‐lead and total lead in fish from the Great Lakes

1990; Wiley; Volume: 4; Issue: 6 Linguagem: Inglês

10.1002/aoc.590040603

1099-0739

D. S. Forsyth, Robert Dabeka, Chantal Cléroux,

Analytical chemistry methods development

Abstract Fillets from a variety of fish species collected from Lakes Ontario, Superior and Erie, Canada, were examined for ionic alkyl‐lead, tetra‐alkyl‐lead and total lead compounds. Diphenylthiocarbazone (dithizone)‐derivatized extracts were collected at pH 8 and 9 for ionic alkyl‐leads from enzymatically hydrolyzed samples. Butylated derivatives were formed prior to analysis by gas chromatography‐atomic absorption spectrometry (GC AA). Tetra‐alkyl‐lead was extracted from the hydrolyzates with hexane. Most of the fillets contained low (<0.08–2 ng g −1 ) levels of trimethyl‐lead. Several samples contained triethyl‐lead or tetraethyl‐lead. Dimethyl‐lead, diethyl‐lead and tetramethyl‐lead were detected by GC MS but were below the GC AA method detection limit of 0.06 ng g −1 , 0.09 ng g −1 and 0.2 ng g −1 respectively. Total lead levels were between <1.8 and 96.7 ng g −1 .