title: [Determination of trace thallium by platform-GFAAS after preconcentration with polyurethane foam].
abstract: OBJECTIVE
  To develop a method for trace thallium determination.
  
  
  METHODS
  Thallium (L) was oxidized to thallium (III) by bromine water and the thallium (III) was complexed to [TlCl4]- in 20 mL/100 mL HCI and absorbed by polyurethane foam. The adsorbed thallium was eluted by a boiling water bath and determined by platform-GFAAS. Tl (III) could be analyzed directly and the total Tl be analyzed after oxidation, so speciation could be achieved.
  
  
  RESULTS
  In the range of 5-100 ng/mL the linear equation was y = 0.013x + 0. 012 with the regression coefficient 0.996. The relative standard deviation was 4.7% for the standard solution of 5.00 ng/mL and the recoveries of water samples were in the range of 95.7%-104.5%.
  
  
  CONCLUSIONS
  The proposed method could determine trace thallium as low as 0.02 ng/mL.
authors.affiliation: Department of Sanitary Technology, West China School of Public Health, Sichuan University, Chengdu 610041, China.
authors.forename: Ya-Jun
authors.initials: YJ
authors.lastname: Meng
authors.forename: Ke-Rong
authors.initials: KR
authors.lastname: Zhang
authors.forename: Bo
authors.initials: B
authors.lastname: Zheng
authors.forename: Jiang-Tao
authors.initials: JT
authors.lastname: Hu
mesh_terms: D000327:Adsorption; D011140:Polyurethanes / Q000737:chemistry*; D013054:Spectrophotometry, Atomic / Q000379:methods; D013793:Thallium / Q000032:analysis*; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D011140:Polyurethanes; D014874:Water Pollutants, Chemical; C028279:polyurethane foam; D013793:Thallium