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Metal Concentrations of Common Freshwater and Marine Fish from the Pearl River Delta, South China

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Abstract

Sediments and fish, including tilapia (Oreochromis mossambicus), bighead carp (Aristichthys nobilis), grass carp (Ctenopharyngodon idellus), and mandarin fish (Siniperca chuatsi) were collected from different fish ponds in the Pearl River Delta (Tanzhou, Sanjiao, Guangzhou, Shipai, Changan, and Mai Po) for the analysis of metalloids and heavy metals [arsenic (As), cadmium (Cd), chromium (Cr), mercury (Hg), and lead (Pb)]. The pollution of As in pond sediments was great; however, As in the edible parts of pond fish were within the international permissible safety levels for human consumption. Axial muscles from 10 species each of freshwater and marine fish purchased from markets in Hong Kong were also analyzed for As, Cd, Cr, Cu, Hg, Ni, Pb and Zn. Freshwater fish contained 0.24 to 2.13 mg/kg As, 0.10 to 0.17 mg/kg Cd, 0.09 to 0.36 mg/kg Cr, 0.06 to 0.35 mg/kg Cu, 0.07 to 0.34 mg/kg Hg, 0.04 to 0.36 mg/kg Ni, 0.11 to 0.52 mg/kg Pb, and 2.67 to 19.1 mg/kg Zn (wet weight). Marine fish had higher Hg and lower Pb concentrations than freshwater fish. A few fish species had average concentrations greater than the international standards for Cd and Pb established by the European Union and the China National Standard Management Department. Total Hg concentrations in 10 of 20 market fish species were generally greater than those of the World Health Organization’s recommended limit of 0.2 mg/kg for at-risk groups, such as children and pregnant women. Daily intake through fish consumption of these metals were compared with the Provisional Tolerable Weekly Intake proposed by the Joint Food and Agriculture Organization/World Health Organization Expert Committee on Food Additives. There appears to be potential threat to local people from Hg contamination because of the high marine fish consumption rate (142 g/d/person).

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Acknowledgments

The authors thank C. Y. Lan and T. G. Luan of Zhongshan University and K. Y. Kong, I. Yeung, and C. W. Lau of Hong Kong Baptist University for their technical assistance. Financial support from the Faculty Research Grant, Science Faculty, Hong Kong Baptist University, is gratefully acknowledged.

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Authors and Affiliations

  1. Croucher Institute for Environmental Sciences and Department of Biology, Hong Kong Baptist University, Kowloon Tong, Hong Kong, PRC

    K. C. Cheung, H. M. Leung & M. H. Wong

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  1. K. C. Cheung
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  2. H. M. Leung
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  3. M. H. Wong
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Correspondence to M. H. Wong.

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Cheung, K.C., Leung, H.M. & Wong, M.H. Metal Concentrations of Common Freshwater and Marine Fish from the Pearl River Delta, South China. Arch Environ Contam Toxicol 54, 705–715 (2008). https://doi.org/10.1007/s00244-007-9064-7

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  • DOI: https://doi.org/10.1007/s00244-007-9064-7

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