期刊
MICROCHIMICA ACTA
卷 181, 期 1-2, 页码 129-137出版社
SPRINGER WIEN
DOI: 10.1007/s00604-013-1079-3
关键词
Lead; Thermosensitive tri-block copolymer; Sample treatment technique; Environmental and biological samples
资金
- Research Council of Shahid Beheshti University
We have designed and synthesized a thermosensitive tri-block copolymer for selective trace extraction of Pb(II) ions from biological and food samples. The polymer was characterized by Fourier transform IR and NMR spectroscopy, and by gel permeation chromatography. The critical aggregation concentration and lower critical solution temperature were determined via fluorescence and UV spectrophotometry, respectively. The effects of solution pH value, amount of copolymer, of the temperature on extraction and on phase separation, and of the matrix on the extraction of Pb(II) were optimized. Pb(II) ions were then quantified by FAAS. The use of this copolymer resulted in excellent figures of merit including a calibration plot extending from 0.5 to 160 mu g L-1 (with an R-2 of > 0.99), a limit of detection (LOD) as low as 90 pg L-1, an extraction efficiency of > 98 %, and relative standard deviations of < 4 % for eight separate extraction experiments.
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