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Combination of flotation and flame atomic absorption spectrometry for determination, preconcentration and separation of trace amounts of metal ions in biological samples
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An efficient enrichment procedure based on the combination of flame atomic absorption spectrometry (FAAS) and flotation for determination of Cd2?, Ag? and Zn2? ions in various biological samples using new collector is studied. The influence of pH, amount of 2-(((1H-benzo[d]imidazol-2-yl)methoxy)methyl)-1H-benzo[d]imidazole (HBIMMHBI) as collector, samplematrix, type and amount of eluting agent, type and amount of surfactant as floating agent, ionic strength and air flow rates on the extraction efficiency were evaluated and optimized. It is ascertained that under study metal ions is preconcentrated simultaneously frommatrix in the presence of 0.005MHBIMMHBI, 0.085% (w/v) of SDS form750 mL at pH 6.5. The floated complexesmetal ions eluted quantitatively with 6mL of 1.0 MHNO3 in methanol lead to achieve preconcentration factor of 125. The detection limits for analyte ions were in the range of 1.3–2.4 ng mL-1, with recoveries more than 95% and relative SD lower than 4%.
Researchers Khodabakhsh Niknam (Second researcher) ,