Human co-exposure to mercury vapor and methylmercury in artisanal mercury mining areas, Guizhou, China

Mercury (Hg) concentrations were determined in human urine and hair samples from Gouxi (GX, n=25) and Laowuchang (LWC, n=18). Tongren, Guizhou, China, to evaluate human exposure from artisanal Hg mining. Geometric means of urinary Hg (U-Hg) were 216 and 560 mu g g(-1) Creatinine (mu g g(-1) Cr) for artisanal mining workers from GX and LWC, respectively, and clinical symptoms (finger tremor) were observed in three workers. The means of hair Me-Hg concentrations were 4.26 mu g g(-1) (1.87-10.6 mu g g(-1)) and 4.55 mu g g(-1) (2.29-9.55 mu g g(-1)) for the population in GX and LWC, respectively. Significant relationship was found between estimated rice Me-Hg intake and hair Me-Hg levels (r=0.73, p<0.001). Co-exposure to Hg vapor and Me-Hg may pose health risks for the study population. (C) 2010 Elsevier Inc. All rights reserved.