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Published on: June 6, 2018
[Determination of trace thallium by platform-GFAAS after preconcentration with polyurethane foam]
Ya-Jun Meng1, Ke-Rong Zhang, Bo Zheng
1Department of Sanitary Technology, West China School of Public Health, Sichuan University, Chengdu 610041, China.
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%.
Conclusion:
The proposed method could determine trace thallium as low as 0.02 ng/mL.
