| The concentrations of hexachlorocyclohexane isomers (HCHs) in muscle, skin, liver, stomach, heart, eggs, feed and feces of chicken from a poultry farm were determined by GC-ECD. The residue level of total HCHs (ΣHCHs) in muscle, skin, liver, stomach and heart were (0.35±0.37), (3.91±2.52), (1.78±1.26), (1.00±0.85), (1.35±0.75) ng/g (wet weight), while the lipid normalized concentrations were (64.3±171), (19.6±7.33), (64.9±27.2), (74.5±74.1), (17.8±4.42) ng/g, respectively，which are far lower than the Maximum Residue Limits for Food in China. Among all tissue samples, the highest lipid-normalized concentration was observed in the liver and no significant differences were observed among other organs. δ-HCH was the predominant isomer in chicken feed, stomach and faces, while β-HCH owned the highest concentration in all other samples. β-HCH was enriched in muscle, skin, liver, stomach and heart, while α-HCH and δ-HCH were also enriched in liver. Significant difference was revealed between male and female chicken in terms of bioaccumulation, indicating higher bioaccumulation ability of the former. |
