Study on four seasons-vertical distribution characteristics of fluorine in water and soil in Western Jilin Province

Vertical distribution characteristics of fluorine in Western Jilin Province in four seasons are analyzed by indoor experiments with typical field site samples. The migration and transformation regularity of fluorine was researched and the influence factors are analyzed too. According to the results, climate variation such as evaporation and precipitation, and the characteristics of aeration zone are the main two factors. Vertical distribution of fluorine varies obviously. There are obviously two peaks from the depth of 0 to 240 cm. and the second one is higher than the first one. Meanwhile, the concentration of fluorine in unsaturated zone is the maximum in July and minimum in February. The concentration of fluorine in surface soils is the maximum in winter, followed by spring, fall and summer. The results show that the concentration of fluorine in surface soil decreases by temperature. In addition, its concentration in unsaturated zone of alkaline soil is higher than in corn field. We analyzed all s samples in surface, and the depth of 40 cm, 80 cm, 120 cm, 160 cm, 200 cm, 240 cm. The variation regularity of is different in the three investigated field sites.