[Determination of trace thallium by platform-GFAAS after preconcentration with polyurethane foam].
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.
Meng
Ya-Jun
YJ
Department of Sanitary Technology, West China School of Public Health, Sichuan University, Chengdu 610041, China.
Zhang
Ke-Rong
KR
Zheng
Bo
B
Hu
Jiang-Tao
JT
D000327:Adsorption; D011140:Polyurethanes / Q000737:chemistry*; D013054:Spectrophotometry, Atomic / Q000379:methods; D013793:Thallium / Q000032:analysis*; D014874:Water Pollutants, Chemical / Q000032:analysis*
D011140:Polyurethanes; D014874:Water Pollutants, Chemical; C028279:polyurethane foam; D013793:Thallium