Human Exposure To Methylmercury through Rice Intake in Mercury Mining Areas, Guizhou Province, China

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• 作者：Xinbin Feng ; Ping Li ; Guangle Qiu ; Shaofeng Wang ; Guanghui Li ; Lihai Shang ; Bo Meng ; Hongmei Jiang ; Weiyang Bai ; Zhonggen Li ; Xuewu Fu
• 刊名：Environmental Science & Technology
• 出版年：2008
• 出版时间：January 1, 2008
• 年：2008
• 卷：42
• 期：1
• 页码：326 - 332
• 全文大小：245K
• 年卷期：v.42,no.1(January 1, 2008)
• ISSN：1520-5851

文摘

The toxicity of methylmercury (Me-Hg) has caused widespread public human concern as a result of several widely publicized disasters. Me-Hg is highly toxic, and the nervous system is its principal target tissue for humans. Although the general population is primarily exposed to Me-Hg through contaminated fish and marine mammals, in Hg mining areas a long history of mining activities can produce serious Hg pollution to the local environment. In a study of 98 persons from the Wanshan Hg mining area, hair Me-Hg levels indicated Me-Hg exposure. Rice, the staple food of the local inhabitants also showed high total Hg (T-Hg) and Me-Hg levels. The geometric mean concentration of T-Hg and mean concentration of Me-Hg in rice samples collected from 3 villages in Wanshan Hg mining area were 36.2 (ranging from 4.9 to 214.7), and 8.5 (ranging from 1.9 to 27.6) µg/kg, respectively, which were significantly elevated compared to the rice samples collected from a reference area, where the mean T-Hg and Me-Hg concentrations were 7.0 (3.2–15.1) and 2.5 (0.8–4.3) µg/kg, respectively. Pork meat, vegetable, and drinking water samples collected in Wanshan Hg mining area contained highly elevated T-Hg, but very low levels of Me-Hg. The relationships between the estimated rice Me-Hg intake and hair Me-Hg levels (r = 0.65, p < 0.001) confirmed rice with high Me-Hg levels indeed was the main route of Me-Hg exposure for the local residents in the Wanshan Hg mining area. From our study, we can conclude that the main human exposure to Me-Hg via food consumption is not restricted to fish, but in some cases in mining areas of China to frequent rice meals.