[M-IS26] 生物地球化学

[MIS26-13] ベトナムにおける地下水のヒ素、マンガン、バリウム汚染とヒトの健康リスク

*阿草 哲郎¹、國頭 恭²、井上 英¹、Tu Binh Minh³、Nguyen Minh Tue¹、Nguyen Ngoc Ha⁴、Nguyen Phuc Cam Tu⁴、Pham Thi Kim Trang³、高橋 真⁵、Bui Cach Tuyen⁶、Pham Hung Viet³、岩田 久人¹、田辺 信介¹ (1.愛媛大学沿岸環境科学研究センター、2.信州大学理学部、3.Hanoi University of Science, Vietnam National University, Vietnam、4.Faculty of Fisheries, Nong Lam University, Vietnam、5.愛媛大学農学部、6.Research Institute for Biotechnology and Environment (RIBE), Nong Lam University, Vietnam)

In this study, we investigated contamination by arsenic and other trace elements in groundwater and in the Red River and the Mekong River Deltas, Vietnam. In addition, we evaluated human health risk from consumption of the contaminated groundwater. Concentrations of arsenic in groundwater were in the range of <0.1 - 502 μg/l, with about 39% of these water samples exceeding WHO drinking water guideline of 10 μg/l. Interestingly, 31% and 5% of groundwater samples had higher concentrations of manganese (400 μg/l) and barium (700 μg/l) than WHO guidelines for drinking water, respectively. Concentrations of arsenic, manganese and barium in hair of local residents were positively correlated with those in groundwater. Estimation using hazard quotient showed that about 43 % of groundwater samples have potential human health risks associated with intakes of these elements. These results suggest that people in these regions are exposed to arsenic, manganese and barium through the consumption of groundwater and hence potential health risks of these elements are of great concern for these local people.