Guangqian Yu

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Between 2001 and 2005, 21,155 of 445,638 wells in 20,517 villages in 292 counties in 16 provinces from China, or 5% of wells, were found to contain > 50 microg/L arsenic (As) by field testing with the Merck As kit. We achieved quality assurance of analysis of at least 10% of the wells containing > 50 microg/L As using hydride generation atomic fluorescence(More)
OBJECTIVE To assess the effects of provided fluoride-safe drinking-water for the prevention and control of endemic fluorosis in China. DESIGN A national cross-sectional study in China. SETTING In 1985, randomly selected villages in 27 provinces (or cities and municipalities) in 5 geographic areas all over China. PARTICIPANTS Involved 81 786 children(More)
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