Arid Zone Research ›› 2019, Vol. 36 ›› Issue (6): 1351-1358.

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Correlation between Fluoride in Shallow Groundwater and Water-Soluble Fluoride in Soil in Togtoh County, Inner Mongolia

LI Zheng-kui1, DONG Shao-gang1, ZHANG Tao2, WANG Chao1, LIU Xiao-bo1   

  1. 1. College of Ecology and Environment, Inner Mongolia University, Hohhot 010021, China;
    2. Hohhot Institute of Environmental Science, Hohhot 010010, Inner Mongolia, China

  • Received:2019-01-15 Revised:2019-03-07 Online:2019-11-15 Published:2019-11-15

Abstract:

The shallow groundwater and soil samples were collected from Togtoh County of Inner Mongolia to analyze the distribution and correlation of fluoride in shallow groundwater and soil there. The results showed that the minimum and maximum values of fluoride concentration in shallow groundwater in the study area were 0.15 mg·L-1 and 7.00 mg·L-1 respectively, and the average value was 2.10 mg·L-1. Most values of the fluorine concentration in shallow groundwater were higher than 1.00 mg·L-1, and the shallow groundwater in most regions in the county was not suitable as the source of drinking water. Holistically, the concentration of fluoride in shallow groundwater in the lacustrine platform in the southeast was higher than that in the alluvial plain in the northwest. The activity of Ca2+ in the shallow groundwater environment with low TH(total hardness) value and alkalescence could decrease and be conducive to the enrichment of F- in shallow groundwater. The spatial distribution of fluoride in shallow groundwater was quite similar to that of water-soluble fluorine in soil. A large amount of fluorine-rich minerals deposited in the lacustrine platform and the piedmont of the Manhan Mountain were the important sources of fluoride in soil and shallow groundwater in this area.

Key words:  groundwater; fluoride, occurrence regularity, water-soluble fluorine, Togtoh County, Inner Mongolia