Abstract
Abstract Four BHC isomers added to 3 L BHC-free distilled water at levels of 1.0, 0.1, and 0.01 ppb were quantitatively recovered (>94%), using an amberlite XAD-2 resin. Cas-liquid chromatography with electron capture detection and a column packed with 2 % Apiezon L on 100—120 mesh Gas-Chrom Q was used as a determinative step. This method was also used to detect BHC residues in tap water and river surface waters in the Kitakyushu District, Japan. The 4 BHC isomers were detected at levels below parts per trillion in almost all the samples analyzed: α-BHC > β-BHC > γ-BHC > δ-BHC. The maximum residue level of total BHC was 0.604 ppb and the minimum was 0.007 ppb. The minimum detectability for total BHC in a 3 L water sample was 0.001 ppb.
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