Abstract:

Water supply in Daxing district of Beijing mainly comes from groundwater, and it is necessary to discuss the distribution law and genesis of high fluorine groundwater for guiding groundwater development and ensuring drinking water safety. Based on field survey and previous research, concentrations of fluoride ion of groundwater from Daxing district of Beijing are measured. The results show that high fluorine water is distributed mainly in cohesive soil, that high fluorine water of shallow layer with 258.57 km² exceeding fluorine national standard is distributed mainly in south and eastsouth of Daxing district, and that high fluorine water is distributed mainly in central section with 20.91 km² exceeding fluorine national standard. Two suggestions are given in this paper as the following: (1) the stopdepth of shallow highfluoride water should be increased, and the structure of drinking water wells should be strictly integrated and designed; (2) the deep highfluoride water should avoid  being drunk or should be drunk after decreasing fluoride content.

Key words: high fluoride groundwater, distribution law, Quaternary；Daxing district of Beijing