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.

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MICELLE-MEDIATED EXTRACTION AS A TOOL FOR SEPARATION AND PRECONCENTRATION IN COPPER ANALYSIS

Indonesian Journal of Chemistry ◽

10.22146/ijc.21669 ◽

2010 ◽

Vol 7 (3) ◽

pp. 278-283

Author(s):

F. Ahmadia ◽

A. Khanmohammadi ◽

A. Malekpour

Keyword(s):

Atomic Absorption Spectrometry ◽

Atomic Absorption ◽

Cloud Point ◽

Flame Atomic Absorption Spectrometry ◽

Cloud Point Extraction ◽

Absorption Spectrometry ◽

Hno3 Solution ◽

Flame Atomic Absorption ◽

Separation And Preconcentration ◽

Triton X

A cloud point extraction method was presented for preconcentration of copper in various samples. After complexation with 4-Amino-2,3-dimethyl-1-phenyl-3-pyrazoline-5-one (ADPP) or N-Benzoyl-N-phenylhydroxylamine (BPA) in water, analyte ions are quantitatively extracted to the phase rich in Triton X-114 after centrifugation. 2.0 mol L-1 HNO3 solution in methanol was added to the surfactant-rich phase prior to its analysis by flame atomic absorption spectrometry (FAAS). The adopted concentrations for ADPP, Triton X-114, HNO3 and parameters such as bath temperature, centrifuge rate and time were optimized. Detection limits (3SDb/m) of 1.3 and 1.9 ng mL-1 for ADPP and BPA along with enrichment factors of 30 and 38 for ADPP and BPA were achieved. The high efficiency of cloud point extraction to carry out the determination of analyte in complex matrices was demonstrated. The proposed method was applied to the analysis of biological, industrial, natural and wastewater, soil and blood samples. Keywords: 4-Amino-2,3-dimethyl-1-phenyl-3-pyrazoline-5-one (ADPP), N-Benzoyl-N-phenylhydroxylamine (BPA) , Cloud Point Extraction, Triton X-114, Flame Atomic Absorption Spectrometry.

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Development of efficient method for preconcentration and determination of copper, nickel, zinc and iron ions in environmental samples by combination of cloud point extraction and flame atomic absorption spectrometry

Open Chemistry ◽

10.2478/s11532-008-0102-8 ◽

2009 ◽

Vol 7 (1) ◽

pp. 148-154 ◽

Cited By ~ 32

Author(s):

Mehrorang Ghaedi ◽

Ardeshir Shokrollahi ◽

Khodabakhsh Niknam ◽

Ebrahim Niknam ◽

Mustafa Soylak

Keyword(s):

Atomic Absorption Spectrometry ◽

Atomic Absorption ◽

Cloud Point ◽

Aqueous Phase ◽

Flame Atomic Absorption Spectrometry ◽

Cloud Point Extraction ◽

Absorption Spectrometry ◽

Flame Atomic Absorption ◽

Triton X

AbstractA cloud point extraction procedure for the preconcentration of copper, nickel, iron and zinc ions in various samples has been described. Analyte ions in aqueous phase are complexed with 3-((indolin-3-yl)(phenyl)methyl)indoline (IYPMI) and following centrifugation quantitatively extracted to the aqueous phase rich in Triton X-114. The surfactant-rich phase was dissolved in 2.0 mol L−1 HNO3 in methanol prior to metal content determination by flame atomic absorption spectrometry (FAAS). The effects of some parameters including, the concentrations of IYPMI, Triton X-114 and HNO3, bath temperature, centrifuge rate and time were investigated on the recoveries of analyte ions. At optimum conditions, the detection limits of (3 SDb m−1) of 1.6, 2.8, 2.1 and 1.1 ng mL−1 for Cu2+, Fe3+, Ni2+ and Zn2+ along with preconcentration factors of 30 and enrichment factor of 48, 39, 34 and 52 for Cu2+, Ni2+, Fe3+ and Zn2+ respectively, were obtained. The proposed cloud point extraction has been successfully applied for the determination of metal ions in real samples with complicated matrix such as biological, soil and blood samples with high efficiency.

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