Department of Biology;
South China Normal University;
Guangzhou 510631;
China;
Department of Biology and Chemistry;
City University of Hong Kong;
83 Tat Chee Avenue;
Kowloon;
Hong Kong;
Institute for Natural Resources and Waste Management;
and Department of Biology;
Hong Kong Bapt ist University;
Kowloon Tong;
Hong Kong;
heavy; metals; edible; molluscs; human; health; Pearl; River; Delt@;