scholarly journals Pre-Concentration Based on Cloud Point Extraction for Ultra-Trace Monitoring of Lead (II) Using Flame Atomic Absorption Spectrometry

2019 ◽  
Vol 9 (22) ◽  
pp. 4752 ◽  
Author(s):  
Ayman H. Kamel ◽  
Abd El-Galil E. Amr ◽  
Mohamed A. Al-Omar ◽  
Elsayed A. Elsayed
Keyword(s):  
Atomic Absorption Spectrometry ◽  
Atomic Absorption ◽  
Cloud Point ◽  
Flame Atomic Absorption Spectrometry ◽  
Cloud Point Extraction ◽  
Limit Of Detection ◽  
Absorption Spectrometry ◽  
Linear Range ◽  
Wide Linear Range ◽  
Flame Atomic Absorption

The cloud point extraction (CPE) method was successfully used for the isolation and pre-concentration of ultra-low concentration of Pb prior to its determination by flame atomic absorption spectrometry (FAAS). Lead(II) reacts with methyl 4,20-diisobutyl-2,5,8,16,19,22- hexaoxo-7,17-dipropyl-3,6,9,15,18,21-hexaaza-1(2,6)-pyridinacyclo-docosaphane-10-carboxylate (DLNL) as chelating agent in the presence of octylphenoxypolyethoxyethanol (Triton X-114) as a nonionic surfactant giving a surfactant-rich phase chelate which could be used for CPE. Factors affecting the CPE such as solution pH, concentrations of the chelating ligand and surfactant, temperature of equilibration, and time were optimized. The efficacy features of the proposed protocol such as linear range, lower limit of detection, pre-concentration, and progress factors were evaluated. The method revealed a wide linear range in the range of 7–250 ng/mL of Pb2+ with a limit of detection of 5 ng/mL using FAAS. Validation of the presented protocol revealed good performance characteristics including high between-batch repeatability, high precision, wide linear range, low limit of detection, and acceptable accuracy. The presented procedure was successfully introduced for the separation and quantification of lead (II) in wastewater samples with acceptable results.

scholarly journals Optimization of cloud point extraction procedure with response surface methodology for quantification of iron by means of flame atomic absorption spectrometry

2013 ◽  
Vol 78 (1) ◽  
pp. 115-127 ◽  
Author(s):  
Hossein Abdolmohammad-Zadeh ◽  
Abdolhossein Naseri ◽  
Golamhossein Sadeghi
Keyword(s):  
Atomic Absorption Spectrometry ◽  
Atomic Absorption ◽  
Cloud Point ◽  
Flame Atomic Absorption Spectrometry ◽  
Cloud Point Extraction ◽  
Limit Of Detection ◽  
Absorption Spectrometry ◽  
Ionic Surfactant ◽  
Flame Atomic Absorption ◽  
Relative Standard

A simple micelle-mediated phase separation method has been developed for the pre-concentration of trace levels of iron as a prior step to determination by flame atomic absorption spectrometry (FAAS). The method is based on the cloud point extraction (CPE) of iron using non-ionic surfactant polyethyleneglycolmono-p-nonylphenylether (PONPE 7.5) without adding any chelating agent. Several variables affecting the extraction efficiency were studied and optimized utilizing central composite design (CCD) and three levels full factorial design. Under the optimum conditions, the limit of detection (LOD), limit of quantification (LOQ) and pre-concentration factor were 1.5 ?g L-1, 5.0 ?g L-1 and 100, respectively. The relative standard deviation (RSD) for six replicate determinations at 50 ?g L?1 Fe(III) level was 1.97%. The calibration graph was linear in the rage of 5-100 ?g L-1, with a correlation coefficient of 0.9921. The developed method was validated by the analysis of two certified reference materials and applied successfully to the determination of trace amounts of Fe(III) in water and rice samples.

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

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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