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Solid Phase-assisted Determination of trace Copper(ll) and Iron(lll) in Food and Water Samples by Cloud Point Extraction: Response Surface Methodology Optimization


Paper Type 
Contributed Paper
Title 
Solid Phase-assisted Determination of trace Copper(ll) and Iron(lll) in Food and Water Samples by Cloud Point Extraction: Response Surface Methodology Optimization
Author 
Farzin Nekouei and Shahram Nekouei
Email 
f.nekouei@hotmail.com; fa.nekouei@gmail.com
Abstract:
 

In this study, a simultaneous cloud point (CP) and solid phase extraction (SPE) procedure for the phase separation and preconcentration of Cu(II) and Fe(III) ions using a synthesized chelating agent, 7'-amino-2,4'-dioxo-2'-thioxo-1',2',3',4'-tetrahydrospiro[indoline-3,5'-pyrano[2,3-d]pyrimidine]-6'-carbonitrile (L1), is reported. L1 is used with tert-octylphenoxypoly(ethoxyethanol) (Triton X-114), in a CPE process to concentrate the metal ions followed by adsorption on activated carbon (AC) and determination of the concentration of metal ions by flame atomic absorption spectrometry (FAAS). The main factors affecting the process, such as the concentrations of Triton X-114, and L1, AC dose as well as the pH of the sample solutions were optimized by a response surface methodology (RSM). The detection limits (3 sdb∙m−1) of Cu(II) and Fe(III) ions under optimum conditions ( X1 (pH) = 6, X2 (AC dose) = 15 mg, X3 (Triton X-114 concentration) = 0.22 % (v/v), and X4 (L1 concentration) = 0.40% (w/v) ) were obtained 0.45 and 0.65 µg∙L−1, respectively. The developed method, validated with certified reference materials, was successfully used in determining the concentrations of metal ions in food and water samples.

Start & End Page 
1960 - 1974
Received Date 
2017-03-19
Revised Date 
Accepted Date 
2017-05-07
Full Text 
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Keyword 
Solid phase assisted cloud point extraction, Copper, Iron, Flame atomic absorption spectrometry, Response surface methodology
Volume 
Vol.45 No.4 (July 2018)
DOI 
Citation 
Nekouei F. and Nekouei S., Solid Phase-assisted Determination of trace Copper(ll) and Iron(lll) in Food and Water Samples by Cloud Point Extraction: Response Surface Methodology Optimization, Chiang Mai Journal of Science, 2018; 45(4): 1960-1974.
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