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Số người truy cập: 39,149,914

 Assessment of lead and cadmium contamination by sediments and bivalve species from the estuaries in Danang city, Vietnam
Tác giả hoặc Nhóm tác giả: Nguyen Van KHANH, Tran Duy VINH, Kenji OKUBO, Kieu Thi KINH, Duong Cong VINH
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Nơi đăng: Journal of Environmental Science for Sustanable Society (JESSS), Okayama University, Japan; Số: vol 6;Từ->đến trang: 123-129;Năm: 2014
Lĩnh vực: Môi trường; Loại: Bài báo khoa học; Thể loại: Quốc tế
TÓM TẮT
As a dynamic economic hub of central region of Vietnam, Danang has experienced several years of rapid urbanization and industrialization. But this impressive growth fails to hide the realities of environmental quality degradation, of which heavy metal contamination has been widely recognized as a risk to human and ecological health. This paper provides an overall assessment of Pb and Cd contaminations by sediments and bivalves from two estuaries of Danang city in the period of 5 years from 2008 to 2012. The pooled values of Pb and Cd contents in sediments from Han and Cu De estuaries, based on Canadian Guidelines, indicated that adverse biological effect might be occasionally provoked in both estuaries, in which Han estuary showed more severe contamination. In addition, excess of Pb and Cd contents was detected in bivalve samples from Han estuary, compared to the permissible limits recommended by Vietnamese Ministry of Health (QCVN 8-1:2011/BYT) whereas lower corresponding values were observed in samples from Cu De estuary but still showed potential risks, suggesting an alarm to dwellers in terms of food consumption. The findings suggested that species Corbicula sp., Crassostrea gigas Th. and Perna viridis L.; and Ostrea rivularis G. may be used as bioindicators for Pb and Cd contamination monitoring in the estuarial environment, respectively.
ABSTRACT
As a dynamic economic hub of central region of Vietnam, Danang has experienced several years of rapid urbanization and industrialization. But this impressive growth fails to hide the realities of environmental quality degradation, of which heavy metal contamination has been widely recognized as a risk to human and ecological health. This paper provides an overall assessment of Pb and Cd contaminations by sediments and bivalves from two estuaries of Danang city in the period of 5 years from 2008 to 2012. The pooled values of Pb and Cd contents in sediments from Han and Cu De estuaries, based on Canadian Guidelines, indicated that adverse biological effect might be occasionally provoked in both estuaries, in which Han estuary showed more severe contamination. In addition, excess of Pb and Cd contents was detected in bivalve samples from Han estuary, compared to the permissible limits recommended by Vietnamese Ministry of Health (QCVN 8-1:2011/BYT) whereas lower corresponding values were observed in samples from Cu De estuary but still showed potential risks, suggesting an alarm to dwellers in terms of food consumption. The findings suggested that species Corbicula sp., Crassostrea gigas Th. and Perna viridis L.; and Ostrea rivularis G. may be used as bioindicators for Pb and Cd contamination monitoring in the estuarial environment, respectively.
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