Rice,vegetable,pork meat,and drinking water were sampled from Guizhou mercury(Hg) mining areas to analyze their total mercury(T-Hg) concentrations.All the samples had higher concentration T-Hg,but only rice accumulated methylmercury(Me-Hg).The average intake of Me-Hg through rice consumption by the residents in three villages of Wanshan Hg mining area occupied 97.5%,94.1%,and 93.5% of the total Me-Hg intake,respectively,and the Me-Hg intake from rice per resident per day had significant relationship with the Me-Hg level of hair,suggesting that rice consumption was the main route of Me-Hg exposure for the local residents in Guizhou Hg mining areas.The T-Hg concentration in the hairs of artisanal mining workers was significantly higher than that of the common people and control group,and the proportion of Me-Hg to T-Hg in the hairs of the common people and control group was only 12.4% on average,illustrating the impact of Hg vapor from artisanal mining activities.Comparing with control group,the residents in Guizhou Hg mining areas had a higher Me-Hg concentration in their hairs.The daily Me-Hg intake through rice consumption by parts of the residents in Guizhou Hg mining areas exceeded the JECFA-recommended value(0.23 μg·d-1·kg-1),and that for a majority of the residents exceeded the USEPA-recommended value(0.10 μg·d-1·kg-1).The residents in Gouxi and Laowuchang of Tongren areas were at a health risk of Me-Hg exposure through rice consumption,and those in other Hg mining areas were at a potential risk of Me-Hg exposure.
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