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Cloud point extraction and flame atomic absorption spectrometry determination of lead (II) in environmental and food samples.

Journal of AOAC International (2013-03-05)
Mustafa Soylak, Erkan Yilmaz, Mehrorang Ghaedi, Mortaza Montazerozohori, Marjan Sheibani
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.

MATERIALS
Product Number
Brand
Product Description

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IGEPAL® CA-720, average Mn ~735
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Triton X-114
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