title: Cloud point extraction and flame atomic absorption spectrometry determination of lead (II) in environmental and food samples.
abstract: A cloud point extraction procedure for the preconcentration of Pb2+ in various samples following complexation with 2,2'-(1E,1'E)-1,1'-(2,2'-azanediylbis(ethane-2,1-diyl)bis(azan-1-yl-1-ylidene)) bis(ethan-1-yl-1-ylidene)diphenol in Triton X-114 after centrifugation is reported. A 0.5 mL portion of methanol acidified with 1.0 M HNO3 was added to the surfactant-rich phase prior to analysis by flame atomic absorption spectrometry. The influence of analytical parameters--including pH, concentrations of ligand, Triton X-114, and HNO3, bath temperature, heating time, and centrifugation rate and time--were optimized, and the effect of the matrix ions on the recovery of Pb2+ was investigated. An LOD of 1.9 ng/mL along with a preconcentration factor of 50 with RSD of 1.0% for Pb2+ were achieved. The proposed procedure was applied to the analysis of various real samples.
authors: University of Erciyes, Chemistry Department, 38039 Kayseri, Turkey.
authors: Mustafa
authors: M
authors: Soylak
authors: Erkan
authors: E
authors: Yilmaz
authors: Mehrorang
authors: M
authors: Ghaedi
authors: Mortaza
authors: M
authors: Montazerozohori
authors: Marjan
authors: M
authors: Sheibani
mesh_terms: D002021:Buffers; D002138:Calibration; D004785:Environmental Pollutants / Q000032:analysis* / Q000737:chemistry; D005504:Food Analysis / Q000379:methods*; D006863:Hydrogen-Ion Concentration; D007202:Indicators and Reagents; D007854:Lead / Q000032:analysis* / Q000737:chemistry; D057230:Limit of Detection; D017942:Nitric Acid / Q000737:chemistry; D017830:Octoxynol; D011092:Polyethylene Glycols; D015203:Reproducibility of Results; D013054:Spectrophotometry, Atomic; D013501:Surface-Active Agents; D013696:Temperature; D014026:Nicotiana / Q000737:chemistry
chemical_list: D002021:Buffers; D004785:Environmental Pollutants; D007202:Indicators and Reagents; D013501:Surface-Active Agents; D007854:Lead; D011092:Polyethylene Glycols; D017942:Nitric Acid; D017830:Octoxynol; C010615:Nonidet P-40