[PAH sources in road runoff system in Beijing].

In this study, road runoff, rainwater, ground sediment and roadside tree water samples were collected from three types of roads in Beijing in 2006. The samples were analyzed for polycyclic aromatic hydrocarbons (PAHs). The average PAH concentrations in each media in May-June were generally higher than those in July-August.

[Residue level of HCHs in chicken].

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 (SigmaHCHs) in muscle, skin, liver, stomach and heart were (0.35 +/- 0.