期刊
MICROCHIMICA ACTA
卷 181, 期 15-16, 页码 1781-1788出版社
SPRINGER WIEN
DOI: 10.1007/s00604-014-1223-8
关键词
Cadmium determination; Lead determination; Fe3O4 nanoparticle; Solid phase extraction; Fruit sample
资金
- Vice-President's Office for Research Affairs of Shahid Beheshti University
We report on a new sorbent for preconcentration of cadmium and lead ions that is based on triazine-functionalized magnetite nanoparticles that were prepared by direct silylation of magnetic nanoparticles with 3-aminopropyltriethoxysilane-2,4-bis(3,5-dimethylpyrazol)-triazine. The sorbent was characterized by IR spectroscopy, X-ray powder diffraction, scanning electron microscopy, thermal and elemental analysis. The sorbent was applied to the preconcentration of lead and cadmium ions which then were quantified by FAAS. The effects of sample pH value, extraction time, of type, concentration and volume of eluent, and of elution time were optimized. The limits of detection are 0.7 ng mL(-1) for Pb(II) ion and 0.01 ng mL(-1) for Cd(II). The effects of potentially interfering ions often found in real samples on the recovery in the determination of cadmium and lead ions in real samples were also investigated. The accuracy of the method was confirmed by analyzing the certified reference materials NIST 1571 (orchard leaves) and NIST 1572 (citrus leaves). Finally, the method was successfully applied to the determination of cadmium and lead ions in some fruit samples.
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