title: [Determination of fluorine in the environmental samples by combustion-hydrolysis-ion selective electrode method].
abstract: OBJECTIVE
  To establish a fast and accurately method of determination of fluorine in coal, hair and food by combustion-hydrolysis-ion selective electrode method.
  
  
  METHODS
  The influence factors on combustion-hydrolysis, such as silica weight, temperature and time of hydrolysis, sample weight and volume of distilled water were studied so that to determine the best of all testing conditions.
  
  
  RESULTS
  The time for hydrolysis in this method was reduced by one third of that of GB/T4633-1997 standard of PRC method. The fluorine in standard reference material such as tea, poplar leaves, coal and capsicum, and corn was determined on precision and accuracy by this method. The relative standard deviation was less than 5%. The recovery varied from 90.3% to 107.6%.
  
  
  CONCLUSIONS
  The method is suitable for determining fluorine in the various environmental samples.
authors.affiliation: Institute of Geographical Sciences and Nature Resources Research CAS, Beijing 100101, China.
authors.forename: Fujian
authors.initials: F
authors.lastname: Feng
authors.forename: Xiaoping
authors.initials: X
authors.lastname: Liu
authors.forename: Jiangping
authors.initials: J
authors.lastname: Yu
authors.forename: Wuyi
authors.initials: W
authors.lastname: Wang
mesh_terms: D002244:Carbon; D003031:Coal / Q000032:analysis; D060729:Coal Ash; D004784:Environmental Monitoring; D004785:Environmental Pollutants / Q000032:analysis*; D005461:Fluorine / Q000032:analysis*; D006801:Humans; D007220:Industrial Waste; D052638:Particulate Matter; D012987:Soil / Q000032:analysis; D014675:Vegetables / Q000737:chemistry; D014881:Water Supply / Q000032:analysis*
chemical_list: D003031:Coal; D060729:Coal Ash; D004785:Environmental Pollutants; D007220:Industrial Waste; D052638:Particulate Matter; D012987:Soil; D005461:Fluorine; D002244:Carbon