Heavy metal concentrations in edible bivalves and gastropods available in major markets of the Pearl River Delta

Molluscs are able to accumulate heavy metals and impose healthhazard to consumers. The main objective of the present study is to investigate the heavy metal concentrations in edible bivalves and gastropods available in major markets of the Pearl River Delta. Fourteen species of edible molluscs were purchased from six markets in Hong Kong and Guangdong Province. The fresh of these biota were tested for their cadmium (Cd), copper (Cu), zinc (Zn), lead (Pb), nickel (Ni), chromium (Cr), antimony (Sb) and tin (Sn)concentrations (based on wet weight). The results indicated that amongst the 14 edible molluscs, only Cd, Pb, Ni, Cr, Sb and Sn concentrations in three species(Ruditapes philippinarum, Perna viridis and Hemifusus tuba) were within the local regulatory limits. Over 60% of bivalve species exceeded maximum permitted levels of Cd (2 μg/g) and Cr (1 μg/g), while over 40% of gastropod species exceeded the maximum levels of Sb (1 μg/g) and Cr(1 μg/g). Most of the samples collected from Hong Kong had significantly higher contents of Pb and Sb, but similar levels of Cd, Cu and Zn when compared with samples collected across the border (p<0.5; p<0.01; p<0.001 respectively). In general, the molluscs purchased in Guangdong markets had higher metal contents than those purchased from the Hong Kong markets. When compared with the Provisional Tolerable Weekly Intake or Maximum Acceptable Daily Load recommended by FAO/WHO Expert Committee on Food Additives, Cd levels of five species (Anadara ferruginea, Pinna pectinata, Chlamys nobilis, Babylonia lutosa and Hemifusus terntanus) and Cr levels of seven species (Anadara ferruginea, Paphia undulata, Pinna pectinata, Babylonia lutosa, Hemifusus terntanus, Cymbium melo and Cipangopaludina chinensis) were higher than both the human daily acceptable limits (for Cd and Cr respectively) and the local regulatory levels (for Cd and Cr respectively).

作 者： FANG Zhan-qiang Cheung R Y H Wong M H   作者單位： FANG Zhan-qiang(Department of Biology, South China Normal University,)

Cheung R Y H(Department of Biology and Chemistry, City University of Hong Kong, 83 Tat Chee Avenue,Kowloon, Hong Kong)

Wong M H(Institute for Natural Resources and WasteManagement, and Department of Biology, Hong Kong Baptist University, Kowloon Tong, Hong Kong) 

刊 名： 環(huán)境科學(xué)學(xué)報(bào)(英文版)  ISTIC SCI 英文刊名： ENVIRONMENTAL SCIENCES  年，卷(期)： 2001 13(2)  分類號(hào)： X17  關(guān)鍵詞：  

【Heavy metal concentrations in edible】相關(guān)文章：

Magnetic properties and heavy metal contents of automobile emission particulates04-26

High efficiency of heavy metal removal in mine water by limestone04-28

Immobilization study of biosorption of heavy metal ions onto activated sludge04-25

Rapid ecotoxicological assessment of heavy metal combined polluted soil using canonical analysis04-26

Heavy metal content in coral reef sediments from Red Sea of Yemen and its significance on marine environment04-27

Inhibition of nitrification in soil by metal diethyldithiocarbamates04-29

Lithium Abundance of Metal-poor Stars04-27

Removal of heavy metals through adsorption using sand04-28

An Efficient Route to Prepare Metal Organosols by Phase Transfer Procedure04-29

Identification of weed species with hyperaccumulative characteristics of heavy metals04-27