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Báo cáo " Accumulation of mercury in sediment and bivalves from Cua Dai estuary, Hoi An city "

The paper presents the research results of accumulation of Mercury in sediment and two bivalves species: Heamolymph Clam (Meretrix meretrix) and Clam (Corbicula sp.) from Cua Dai estuary, Hoi An city. The average concentration of Hg in sediments is 0.145 ± 0.052 μg/g, under allowed limit by the PELS standard (Canada) (≤ 0.7 μg/g). Content of Hg accumulated in the tissues of Meretrix meretrix is 0.073 ± 0.045 μg/g and H is 0.066 ± 0.044 μg/g, lower than the allowed standard of the Ministry of Health. Concentration of Hg in sediments and tissues of. | VNU Journal of Science Earth Sciences 26 2010 48-54 Accumulation of mercury in sediment and bivalves from Cua Dai estuary Hoi An city Nguyen Van Khanh1 Vo Van Minh1 Nguyen Duy Vinh1 Luu Duc Hai2 1 University of Education Danang University 2Faculty of Environmental Sciences Hanoi University of Science VNU 334 Nguyen Trai Hanoi Vietnam Received 17 December 2009 received in revised form 31 December 2009 Abstract. The paper presents the research results of accumulation of Mercury in sediment and two bivalves species Heamolymph Clam Meretrix meretrix and Clam Corbicula sp. from Cua Dai estuary Hoi An city. The average concentration of Hg in sediments is 0.145 0.052 Eg g under allowed limit by the PELS standard Canada 0.7 Eg g . Content of Hg accumulated in the tissues of Meretrix meretrix is 0.073 0.045 Eg g and H is 0.066 0.044 Eg g lower than the allowed standard of the Ministry of Health. Concentration of Hg in sediments and tissues of Meretrix meretrix is positive correlation at medium correlation r 0.311 Pvalue 0.415 while for Corbicula sp. is lower correlation with weak correlation r 0.138 Pvalue 0.722 . Results show that at Cua Dai estuary city of Hoi An Meretrix meretrix can be used as bioindicator species for Hg pollution. Keywords toxicity pollution accumulation bioindicator Meretrix Corbicula. 1. Introduction Pollution of mercury Hg in sediments has different origins such as industrial agricultural and mining activities. In water environment Hg usually exists in the form of MeHg with high toxicity and magnification 1-3 . Quang Nam is a province with fast development of industry and mining especially gold tin copper zinc mining activities. In particular raw gold mining is the main reason leading to Hg pollution in the Thu Bon River. According to Tran Hieu Nhue 2000 in the Thu Bon River upstream concentration of Hg exceeded the standard for 5 times 3 . Corresponding author. Tel. 84-4-38584995. E-mail haiqlmt@yahoo. com This paper presents the research results .