title: [Sequential extraction experiments applied to study chemical mobility of fluorine in rocks].
abstract: Sequential extraction experiments were used to study the chemical mobility of fluorine in rocks. The results show that there are quite big differences in chemical mobility of fluorine in rocks of different types. Fluorine in carbonate rock is very active, in which the proportion of leachable fluorine is generally more than 75%. Fluorine in black rocks of Lower Cambrian is closely related to their different metamorphosed grades, in which fluorine in black carbonaceous slate with higher metamorphosed grade mostly has lower leachability than black shale and black siliceous rock. Generally speaking, the leachable percentage of fluorine is high in phosphorite rocks and low in phyllite. The leachable fluorine in diabase is in direct proportion to its fluorine concentration. There are some differences in chemical mobility of fluorine in stone coal of different ages. Fluorine in stone coal of Silurian has higher leachability than stone coal of Cambrian.
authors.affiliation: Key Laboratory of Coal Resources, Ministry of Education, China University of Mining and Technology, Beijing 100083, China.
authors.forename: Li-Rong
authors.initials: LR
authors.lastname: Xu
authors.forename: Han-Dong
authors.initials: HD
authors.lastname: Liang
authors.forename: Kun-Li
authors.initials: KL
authors.lastname: Luo
authors.forename: Fu-Jian
authors.initials: FJ
authors.lastname: Feng
authors.forename: Jian-An
authors.initials: JA
authors.lastname: Tan
mesh_terms: D005591:Chemical Fractionation / Q000379:methods*; D005461:Fluorine / Q000032:analysis / Q000302:isolation & purification*; D019015:Geologic Sediments / Q000737:chemistry*; D012989:Soil Pollutants / Q000032:analysis / Q000302:isolation & purification*
chemical_list: D012989:Soil Pollutants; D005461:Fluorine