西藏左贡县绕金乡地方性氟中毒区环境氟异常及矫正对策

高氟温泉是导致本病区环境氟异常的氟源，人为引高氟温泉作生产、生活用水，加大了氟异常波及的范围和程度，高氟饮水和低氟饮水加高氟粮食是导致居民氟中毒的主要原因，改水降氟是矫正环境氟异常和防治氛中毒的根本对策，分析表明它具有显著的社会效益和间接经济效益．

THE ENVIRONMENTAL FLUORINE ABNORMALITY AND RECTIFYING STRATEGIES ON THE LOCALLY FLUORIOSIS AREA IN RAOJIN TOWNSHIP OF ZUOGONG COUNTY, TIBET

In the fluoriosis area of Raojin Township, It has been found that hot spring is the fluorine source for the environmental fluorine abnormality, drawing hot spring for irrigating and living water intensifies the extent and range of environmental fluorine abnormality, drinking the water contained high content of fluorine is the major factor for fluoriosis of inhabitants, and drinking the water contained low content of fluorine but using fial contained high content of fluorine can also cause fluoriosis of inhabitants. Based on the technical analysis and economic evaluation, reducing fluoring content in water is the fundamental strategy to rectify the environmental fluorine abnormality and prevent fluoriosis of inhabitants, possesses outstanding social benefit and great indirect economic benefit.