Esmael Sanchooli

Zabol University, Zābol, Ostan-e Sistan va Baluchestan, Iran

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Publications (12)12.67 Total impact

  • Mostafa Khajeh, Esmael Sanchooli
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    ABSTRACT: A simple procedure based on magnetic nanoparticles has been developed for analytical purposes. In this method, 1-(2-pyridylazo)-2-naphthol (PAN)-modified magnetic nanoparticles (MNPs) were used for separation and pre-concentration of manganese(II) ions from aqueous samples. This method combines the use of a solution solvent with separation of magnetic nanoparticles from sample solution using a magnet. The influence of different parameters, such as amount of extractant (PAN) loaded on the nanoparticles, pH of solution, adsorption time, amount of modified nanoparticle, type and amount of eluents for desorption of manganese from magnetic nanoparticles were evaluated. The effect of various cationic and anionic interferences on the percentage recovery of manganese was also studied. Manganese ions were adsorped from a solution at pH 9.5 and desorbed from nanoparticles with 10 mL of DMSO : HNO3 (1 : 1, v/v). The detection limit of the proposed method was found to be 0.11 µg L. The method was employed to recover and determine the level of manganese in different water samples.
    International Journal of Environmental Analytical Chemistry - INT J ENVIRON ANAL CHEM. 01/2012; 92(5):613-619.
  • Mostafa Khajeh, Esmael Sanchooli
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    ABSTRACT: A new, simple, and fast method for preconcentration and determination of trace amount of lead from biological samples was developed by modified silver nanoparticle-based solid-phase extraction technique and graphite furnace atomic absorption spectrometry. In this study, morin was used as a complexing agent. Some factors influencing the recovery of lead including pH, sample flow rate, type, flow rate, and least amount of the eluent for elution of the lead from silver nanoparticles were studied and optimized. Under the optimum conditions, the detection limit of this method was 68 ng L(-1), and the relative standard deviation was 4.1% (n = 10, c = 20 μg L(-1)). The developed procedure was validated by the analysis of certified reference material and applied to the recovery and determination of lead in biological samples.
    Biological trace element research 03/2011; 143(3):1856-64. · 1.92 Impact Factor
  • Mostafa Khajeh, Esmael Sanchooli
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    ABSTRACT: This work describes the development by response surface methodology (RSM) of a procedure for copper determination by inductively coupled plasma optical emission spectrometry (ICP OES) in water samples after extraction by copper imprinted polymer. Results of the two-level full factorial design (2) based on an analysis of variance demonstrated that only the solution pH; amount of polymer and adsorption time were statistically significant. Optimal conditions for the extraction of copper samples were obtained by using Box-Behnken design. Solution pH; amount of polymer and adsorption time were regarded as factors in the optimisation study. The working conditions were 4.6, 0.03 g and 3.5 h, for solution pH, amount of polymer; and adsorption time, respectively. Under the optimised experimental conditions, the detection limit of the proposed method followed by ICP OES was found to be 0.8 µg L. The relative standard deviation (RSD) was found to less than 0.81%. The pre-concentration factor was 22.5. The accuracy of the optimised procedure was evaluated by analysis of certified reference material. The method was applied to the determination of copper in water samples.
    International Journal of Environmental Analytical Chemistry 01/2011; · 1.24 Impact Factor
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    M. Khajeh, E. Sanchooli
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    ABSTRACT: In the present work, a procedure for the preconcentration and determination of lead trace amounts of lead in fish species and water samples by graphite furnace atomic absorption spectrometry (GF AAS) is proposed, which is based on the batch solid phase extraction of lead ions by modified magnetic nanoparticles. An optimization process was performed using two-level fractional factorial designs (24-1) and a Box–Behnken matrix. Four variables (pH of solution, nanoparticles mass, morin mass, and shaking time) were regarded as factors in the optimization. The detection limit of the proposed method was found to be 81.0ng/l. Six samples of fish and three samples of water (tap, river, and lake) were analyzed for lead. The lead contents ranged in fish from 0.013 to 0.038μg/g and in water from 7.1 to 9.0μg/l. Keywordslead–Box–Behnken design–magnetic nanoparticle–preconcentration–fish–water samples
    Journal of Applied Spectroscopy 01/2011; 78(3):414-420. · 0.69 Impact Factor
  • Mostafa Khajeh, Esmael Sanchooli
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    ABSTRACT: In this study, ion-imprinted polymer was prepared for manganese(II) by formation of binary (1-(2-pyridylazo)-2-naphthol) complex in methanol (porogen) following copolymerization with 4-vinylpyridine (VP), ethyleneglycoldimethacrylate (EDMA), and 2,2′-azobisisobutyronitrile (AIBN) as a functional monomer, cross-linking agent, and initiator, respectively. The standardized effects of the independent variables and their interactions were also investigated using Pareto chart. Results of the two-level fractional factorial design (24-1) based on an analysis of variance demonstrated that only pH of solution, amount of polymer, and adsorption time were seen to be statistically significant. For optimization of manganese removal from aqueous solution by manganese-imprinted polymer (Mn-IP) a three-factor, three level Box-Behnken design techniques combining with response surface methodology (RSM) was used on 15 different experimental data obtained in a batch study. The significance of independent variables and their interactions were tested by the analysis of variance (ANOVA) with 95% confidence limits. The optimal conditions were 9.7, 44.4mg, and 19.1min for pH of solution, amount of polymer, and adsorption time, respectively. Under the optimized experimental conditions, the detection limit of the proposed procedure followed by ICP-OES was found to be 0.6μgL−1. Furthermore, the distribution ratio and selectivity coefficients of manganese and other selected ions were investigated. The method was applied to the determination of manganese in water samples. KeywordsManganese–Response surface methodology–Box-Behnken design–Imprinted polymer–Water samples
    Polymer Bulletin 01/2011; 67(3):413-425. · 1.33 Impact Factor
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    ABSTRACT: In this work, several lead-ion imprinted polymers (Pb(II)-IIP) for pre-concentration and determination of lead by graphite furnace atomic absorption spectrometry were synthesized based on the batch solid phase extraction. For this purpose, copolymerization of Pb(II)–morin complex was performed using 4-vinylpyridine (VP), ethyleneglycoldimethacrylate (EDMA) and 2,2′-azobisisobutyronitrile (AIBN) as functional monomer, cross-linking agent and initiator, respectively. The polymer particles were characterized by FT-IR and X-ray diffraction (XRD). The optimization process was carried out using a two-level fractional factorial design and the Box–Behnken matrix. Four variables including pH, shaking time, mass of polymer and morin were selected as the factors affecting the optimization process. The obtained results using the two-level fractional factorial design indicated that pH, mass of polymer and morin were statistically significant. Using the Box–Behnken design, the optimal conditions for the extraction of lead were 6.1, 29.2 mg and 2.7 mg, for pH, mass of polymer and morin, respectively. Under the optimized conditions, the detection limit of the proposed method was found to be 92 ng L−1, while the relative standard deviation for 10 replicates was 4%.
    Chemical Engineering Journal. 01/2011; 166(3):1158-1163.
  • Mostafa Khajeh, Esmael Sanchooli
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    ABSTRACT: This article describes the development by response surface methodology (RSM) of a procedure for zinc and iron determination by flame atomic absorption spectrometry (FAAS) in food samples after extraction by microwave system. A Box–Behnken matrix was used to find optimal conditions for the procedure through response surface study. Three variables “irradiation power and time and temperature” were regarded as factors in the optimization study. The working conditions were established as a compromise between optimum values found for each analyte. These values were 80°C, 105W, and 9.0min, for temperature, irradiation power and time, respectively. The method was applied to the determination of iron and zinc in two celery samples. KeywordsIron-Zinc-Box–Behnken Design-Microwave-Assisted Extraction-Celery
    Food Analytical Methods 01/2010; 3(2):75-79. · 1.97 Impact Factor
  • Mostafa Khajeh, Esmael Sanchooli
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    ABSTRACT: In the present study, we developed a magnetic nanoparticle adsorbent that uses iron oxide nanoparticles as the core and 1-(2-pyridylazo)-2-naphthol (PAN) as manganese ion exchange groups in cereal samples. This adsorbent was shown to be quick and efficient for the adsorption of manganese due to higher specific surface area, lower mass removal resistance and the absence of internal diffusion resistance. This method is simple and rapid for the preconcentration and determination of manganese in food samples by inductively coupled plasma optical emission spectrometry (ICP OES). The technical feasibility of magnetic nanoparticles for the removal of manganese was investigated under batch studies. It was based on (PAN)-modified magnetic nanoparticles. Four variables (pH of solution, amount of extractant (E), amount of nanoparticles (N) and time) were regarded as factors in the optimization. Results of the two-level fractional factorial design (24−1) based on an analysis of variance demonstrated that only the pH, amount of extractant (E) and amount of nanoparticles (N) were statistically significant. Optimal conditions for the extraction of manganese were obtained using Box–Behnken design. For optimum recovery of manganese, the variables pH of solution, amount of nanoparticles and amount of extractant values were 9.44, 3.46mg and 3.91mg, respectively. In the optimum experimental conditions, the limit of detection and enrichment factor of the proposed method were 0.1μgL−1 and 28, respectively. The precision as RSD was 3.6% for concentration of 50μgL−1. The accuracy of the proposed procedure was evaluated by analysis of certified reference material. The method was applied to the determination of manganese in barley, wheat and rice flour samples. The manganese content in the samples analyzed varied from 7.8 to 19.9μgg−1.
    Journal of Food Composition and Analysis - J FOOD COMPOS ANAL. 01/2010; 23(7):677-680.
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    ABSTRACT: The present work describes the development of a microwave-assisted extraction procedure for the determination of zinc and copper in cereal samples employing flame atomic absorption spectrometry (FAAS). A Doehlert design was carried out in order to determine the optimum conditions for the procedure through response surface study. Three variables (irradiation power, time, and temperature) were regarded as factors in the optimization study. The working conditions were established as a compromise between optimum values found for each analyte. These values were 110.0°C, 176.0W, and 16.0min, for temperature, irradiation power, and time, respectively. The accuracy of the optimized procedure was evaluated by analysis of certified reference materials. The procedure proposed was applied for the determination of copper and zinc in cereal samples. KeywordsCopper-Zinc-Doehlert Design-Microwave-assisted Extraction-Cereal Samples
    Food Analytical Methods 01/2010; 3(3):133-137. · 1.97 Impact Factor
  • Mostafa Khajeh, Esmael Sanchooli
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    ABSTRACT: In this study is proposed a pre-concentration procedure using molecular imprinted polymer for the determination of copper in food samples. The copper imprinted polymer was prepared by free radical solution polymerization in a tube containing copper, morin, 4-vinylpyridine as a functional monomer, ethyleneglycoldimethacrylate as a cross-linking monomer, and 2,2'-azobisisobutyronitrile as an initiator. The polymer particles synthesized both before and after leaching have been characterized by infrared and X-ray diffraction studies. The effect of different variables such as pH of solution, adsorption and desorption time, type, and least amount of eluent for elution of the complex of polymer was evaluated. Extraction efficiencies more than 99% were obtained by elution of the polymer with 10 mL of 0.5 mol L(-1) EDTA. The detection limit of the proposed procedure was 0.14 microg L(-1). The method was applied to the determination of copper in food real samples.
    Biological trace element research 09/2009; 135(1-3):325-33. · 1.92 Impact Factor
  • Mostafa Khajeh, Esmael Sanchooli
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    ABSTRACT: Imprinted polymer particles have been developed as a novel adsorbent for the adsorption of copper from aqueous solution. This method has received much attention in various fields because of their high selectivity for template molecules. In this work, separation of copper from water and biological samples by batch solid phase extraction based on molecular imprinting technique is presented. Copper-imprinted polymer was prepared by free radical solution polymerization in a glass tube containing CuSO4, morin, 4-vinylpyridine as a functional monomer, ethyleneglycoldimethacrylate as a cross-linking monomer, 2,2′- azobisisobutyronitrile as an initiator. The polymer block obtained was ground and sieved, and the Cu-morin complex was removed from polymer particles. The synthesized polymer particles both prior to and after leaching have been characterized by IR and X-ray diffraction studies. The effect of different parameters, such as pH, adsorption and desorption time, type and least amount of the eluent for elution of the complex from polymer were evaluated. The limit of detection of the proposed method was 0.12μgL−1. The method was applied to the recovery and determination of copper in water and biological real samples. KeywordsCopper–Molecular imprinting polymer–Morin–Determination–Water analysis
    Environmental Chemistry Letters 9(2):177-183. · 1.62 Impact Factor
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    Mostafa Khajeh, Esmael Sanchooli
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    ABSTRACT: In this study, a new solid phase extractor, nano-scale silver particles were synthesized. The silver nanoparticle-based solid phase extraction was used for separation and preconcentration of the trace amount of cobalt ion from various water samples prior to its determination by flame atomic absorption spectrometry. The effects of various parameters, including pH, amount of complexing agent [1-(2-pyridylazo)-2-naphthol] (PAN), flow rates of solution and eluent, type and least amount of the eluent for elution of the cobalt from silver nanoparticles were studied and optimized. Under the optimum conditions, the detection limit of this procedure was 0.78μgL−1, and the relative standard deviation (RSD%) was 3.1% (n=10, c=20μgL−1). This method was applied to the determination of cobalt in water samples. KeywordsCobalt–Silver nanoparticle–Solid phase extraction–Water samples
    1(4):205-209.