PCBs in freshwater fish and sediments collected from the Pearl River Delta and Hong Kong.
1. PCBs levels in pond sediments were less than 1 ng/g (dry wt).
2. PCBs concentrations in river sediments ranged from 43-461 ng/g (dry
wt), which were higher than the previous studies in relation to Shing
Mun River (12.7-46.0 ng/g dry wt, Chui et al. 1991), Tolo Harbour (5.0-
15.3 ng/g wet wt, Connell et al. 1998) and Victoria Harbour (3.2-81 ng/g
dry wt, Hong et al. 1995).
3. Although PCBs concentrations in fish flesh collected from fish ponds in
the Pearl River Delta and Hong Kong did not exceed the NEPA
maximum permissible limits (0.2 ?g/g wet wt), 16% of fish collected
from the Pearl River Delta and 100% of fish collected from the rivers in
Hong Kong exceeded the more stringent guidelines of US EPA (0.01