A Cloud Point Extraction Procedure for Preconcentration/Flame Atomic Absorption Spectrometric Determination of Silver, Zinc, and Lead at Subtrace Levels in Environmental Samples

作者：Ghaedi Mehrorang^*; Shokrollahi Ardeshir; Niknam Khodabakhsh; Niknam Ebrahim; Derki Somayyeh; Soylak Mustafa

来源：Journal of AOAC International, 2009, 92(3): 907-913.

A cloud point extraction (CPE) procedure was presented for the preconcentration of silver, zinc, and lead ions in various samples. The complexes of these metal ions with 2-(((1 H-benzo[d]imidazol -2-yl)methoxy)methyl)-1 H-benzo[d]imidazole (BIMMBI) are quantitatively extracted into the Triton X-114-rich phase after centrifugation. A solution of 1.0 M HNO(3) in methanol was added to the surfactant-rich phase as the effective eluant before analysis by flame atomic absorption spectrometry. The influence of effective parameters such as the concentrations of BIMMBI, Triton X-114, and HNo(3), pH, bath temperature, centrifuge rate, and time on method sensitivity and efficiency was optimized. Detection limits of 2.8,1.7, and 1.1 ng/mL for Pb(2+) Ag(+), and Zn(2+), respectively, along with a preconcentration factor of 30 and enrichment factors of 33, 48, and 53 for Pb(2+), Ag(+), and Zn(2+) respectively, were obtained. The present CPE method is suitable for accurate and precise determination of trace amounts of analyte ions in complex matrixes. The proposed CPE procedure was applied to the determination of these ions in biological, natural water, wastewater, soil, and blood samples.

• 出版日期2009-6