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Mercury pollution due to gold mining activities in the North of Viet Nam

To obtain the basic information on human exposure to mercury (Hg) due to gold mining activities in North of Viet Nam, total mercury was determined for human hair and blood samples collected from population living in gold mining area. The results indicate that the mercury concentrations measured in 98 blood samples with ranging from 1.128 to 22.751 ppb and 65 hair samples with ranging from 0.379 to 2.440 ppm, the good correlation between concentration of mercury in hair and blood samples was found in people and the ratios of hair Hg to blood hair were 195 for males and 142 for females | Journal of Chemistry Vol. 40 No. DB P.189 -193 2002 MERCURy POLLUTION DUE TO GOLD MINING ACTIVITIES IN THE NORTH OF VIET NAM Received 06-8-2002 TRINH XUAN GIAN LE LAN ANH vu Duc LQI TRAN VAN Huy1 HIRQKATSU AKAGY2 MINESHI SAKAMQTQ2 institute of Chemistry Viet Nam National Center for Natural Science and Technology 2National Institute for Minamata dissease Japan SuMMARy To obtain the basic information on human exposure to mercury Hg due to gold mining activities in North of Viet Nam total mercury was determined for human hair and blood samples collected from population living in gold mining area. The results indicate that the mercury concentrations measured in 98 blood samples with ranging from 1.128 to 22.751 ppb and 65 hair samples with ranging from 0.379 to 2.440 ppm the good correlation between concentration of mercury in hair and blood samples was found in people and the ratios of hair Hg to blood hair were 195 for males and 142 for females I - INTRODUCTION Environmental mercury pollution due to gold mining in the North of Viet Nam has been concerned in recent years. In the gold mining processes an enormous amount of metallic Hg has been used and released in an abusive way into local ecosystems over the last 15 years of which are discharged in to the river system and the atmosphere. Owing to this metal therefore there is a possibility of causing two types of health hazards in near gold mining Firstly accumulation inorganic mercury poisoning by direct inhalation of mercury vapor during the processes of burning and re-burning Hg-Au amalgam. Secondly a part of mercury discharged into the river system is methylated and ultimately bio-accumulated to a significant level in fish. Thus people living along the river and depending on riverine products are easily exposed to methyl mercury MeHg and may develop toxically levels through repeated consumption of these contaminated fish. The people living near gold mining areas may be contaiminated with at least two forms of .