N. Pourreza

Shahid Chamran University of Ahvaz, Nāşerī, Khūzestān, Iran

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Publications (58)106.19 Total impact

  • Nahid Pourreza, Kowsar Sheikhnajdi
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    ABSTRACT: A new solid-phase extraction method for determination of palladium by atomic absorption spectrometry is described. Multiwalled carbon nanotube (MWCNT) modified with 1-butyl 3-methyl imidazolium hexafluorophosphate (MWCNT-[BMIM]PF6) and supported on sawdust was used as an adsorbent for preconcentration of palladium. Palladium ions are retained on (MWCNT-[BMIM]PF6) adsorbent as [PdI4]2− and eluted from the column with a thiosulfate–ammonia mixture. The optimum conditions for the adsorption were evaluated by changing various parameters such as pH, sample volume, concentration and volume of eluent, iodide concentration and interfering ions to achieve highest sensitivity and selectivity. The calibration graph was linear in the range of 2–120 ng mL−1 of palladium in the initial solution and the limit of detection based on 3Sb was 0.41 ng mL−1. The method was applied to the determination of palladium in water, wastewater and soil samples.
    Journal of the Iranian Chemical Society 06/2014; 11(3). · 1.47 Impact Factor
  • Nahid Pourreza, Hamed Golmohammadi
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    ABSTRACT: In this paper, green curcumin nanoparticles (CURNs) are introduced for colorimetric sensing of sulfide using micelle mediated cloud point extraction for the first time. CURNs are transferred into non-ionic surfactant phase and show strong surface plasmon absorption intensity. The extraction of CURNs to the surfactant rich phase is suppressed in the presence of Cu2+ but upon addition of sulfide, the extraction of CURNs to the surfactant rich phase is increased again. This increase in the absorbance of surfactant rich phase is related to the sulfide concentration and was used as an analytical signal for the sensing of sulfide. The effect of chemical variables such as pH of the sample solution, concentration of Cu2+, electrolyte and CURNs on the cloud point extraction was studied. Under optimum conditions, the change in absorption intensity was linearly proportional to the concentration of sulfide in the range of 0.5–200.0 ng mL−1 with a detection limit of 0.4 ng mL−1. The relative standard deviations for 10 replicate measurements of 20 ng mL−1 and 175 ng mL−1 of sulfide were 4.1% and 1.4% respectively. The method was successfully applied to the determination of sulfide in different water samples.
    Talanta 01/2014; 119:181–186. · 3.50 Impact Factor
  • N. Pourreza, S. Rastegarzadeh, A. Larki
    Journal of Industrial and Engineering Chemistry. 01/2014; 20(5):2680–2686.
  • N. Pourreza, S. Rastegarzadeh, A. Larki
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    ABSTRACT: Nano-TiO2 was modified with 2-mercaptobenzimidazole via surfactant activation and used as an adsorbent for the removal of Ag(I) under optimum conditions. The adsorbent was characterized using powder X-ray diffraction and FT-IR spectroscopy. The equilibrium data were fitted to the Langmuir, Freundlich and Temkin isotherm models. Langmuir isotherm describes the adsorption data better than Freundlich isotherm and Temkin. Kinetic studies showed that the pseudo second order kinetic model fits the adsorption kinetic processes well. Maximum adsorption capacity for Ag(I) was 128.2 mg g−1 of nano-TiO2. The method was successfully applied to the removal of silver from radiology film processing wastewater samples.
    Journal of Industrial and Engineering Chemistry. 01/2014; 20(1):127–132.
  • Nahid Pourreza, Tina Naghdi
    Talanta 01/2014; 128:164–169. · 3.50 Impact Factor
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    ABSTRACT: A novel and simple method for the sensitive determination of trace amounts of fungicide thiram is developed by combination of dispersive liquid-liquid microextraction (DLLME) and microvolume UV-vis spectrophotometry. The method is based on the conversion of thiram to a yellow product in the presence of ethanolic potassium hydroxide and copper sulfate, and its extraction into CCL4 using DLLME technique. In this method the ethanol existing in ethanolic KOH plays as disperser solvent and a cloudy solution is formed by injection of only CCl4 as extractant solvent into sample solution. Under the optimum conditions, the calibration graph was linear over the range of 25-1000ngmL(-1) of thiram with limit of detection of 11.5ngmL(-1). The relative standard deviation (RSD) for 100 and 500ngmL(-1) of thiram was 2.7 and 1.1% (n=8), respectively. The proposed method was successfully applied to determination of thiram in water and plant seed samples.
    Spectrochimica Acta Part A Molecular and Biomolecular Spectroscopy 05/2013; 114C:46-50. · 1.98 Impact Factor
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    ABSTRACT: An optical chemical sensor has been developed for the sensitive determination of Fe (III) ions by spectrophotometry. The optical membrane was constructed by immobilization of methyltrioctylammonium chloride on triacetylcellulose polymer. The exchange of thiocyanate as counter ion in the membrane sensitized this film to Fe (III). The sensing membrane is capable of determining Fe(III) reversibly over a dynamic range of 7.11 × 10−7−8.88 × 10−5 mol L−1 with a limit of detection of 6.02 × 10−7 mol L−1 and a response time of 5 min. This optode can easily be regenerated by 0.1 mol L−1 of sodium fluoride solution. The relative standard deviation for eight replicate measurements of 7.11 × 10−6 and 5.33 × 10−5 mol L−1 of Fe (III) was 4.2 and 3.7%, respectively. The sensor was successfully applied for the determination of iron in tablet and water samples.
    Instrumentation Science & Technology 05/2013; 41(3):290-300. · 0.43 Impact Factor
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    ABSTRACT: A new solid phase extraction procedure was developed for preconcentration of iron(II) using silica gel-polyethylene glycol (silica-PEG) as an adsorbent. The method is based on retention of iron(II) as 2,2′ bipyridine complex on silica-PEG. The retained complex is eluted by 1.0 mol L−1 of sulfuric acid-acetone mixture (1:2) and its absorbance is measured at 518 nm, spectrophotometrically. The effects of different parameters such as pH, concentration of the reagent, eluting reagent, sample volume, amount of adsorbent, and interfering ions were investigated. The calibration graph was linear in the range of 1–60 ng mL−1 of iron(II). The limit of detection based on was 0.57 ng mL−1 and relative standard deviations (R.S.D) for ten replicate measurements of 12 and 42 ng mL−1 of iron(II) were 2.4 and 1.7%, respectively. The method was applied to the determination of of iron(II) in water, multivitamin tablet, and spinach samples.
    Journal of Spectroscopy. 10/2012; 2013.
  • N Pourreza, K Sheikhnajdi
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    ABSTRACT: Multi-walled carbon nanotube (MWCNT) was dispersed and loaded with 1-buthyl 3-methyl imidazolium hexaflouro phosphate ([BMIM]PF(6)), supported on sawdust and used as a new adsorbent for preconcentration of trace amount of bismuth. In this method, Bi(III) ions are retained by the adsorbent in a column after formation of negative complex with iodide. BiI(4)(-) complexes are retained on MWCNT-[BMIM]PF(6) through the electrostatic interactions with positive charge of imidazolium ion. The adsorbed complex is eluted from the column with a solution of nitric acid and determined by flame atomic absorption spectrometry (FAAS). The effect of various parameters, such as pH, sample volume, concentration and volume of nitric acid as eluent, iodide concentration in sample solution, and interfering ions was investigated in order to achieve highest sensitivity. The calibration graph was linear in the range of 4-300ngmL(-1) for Bi(III) in the initial solution. The limit of detection based on 3S(b) was 2.3ngmL(-1) for Bi(III). The relative standard deviation for ten replicate measurements of 20 and 80ngmL(-1) was 2.3 and 0.98%, respectively. The method was applied to the determination of Bi(III) ions in river water, tap water and drug samples.
    Talanta 09/2012; 99:507-11. · 3.50 Impact Factor
  • N. Pourreza, S. Kamran-Hekani
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    ABSTRACT: A simple method for the selective and sensitive kinetic spectrophotometric determination of iron (II) is described. The method is based on the oxidation reaction of reduced phenolphthalein by periodate in alkaline media. The change in absorbance was measured using the fixed time method. The effect of different variables on the reaction was investigated and optimum conditions were obtained. The calibration curve was linear in the range 50–3000 ng/mL, and a detection limit of 17 ng/mL was obtained. The relative standard deviation of ten replicate determinations of 200 ng/mL of Fe(II) was 1.2%. The determination of Fe(II) in the presence of a 50-fold amount of Fe(III) could be carried out.
    Journal of Analytical Chemistry 04/2012; 55(5):440-442. · 0.62 Impact Factor
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    ABSTRACT: Immobilization of β-cyclodextrin on Dowex resin as an insoluble polymeric matrix by covalent bond presents a new solid-phase medium for preconcentration of Pb (II) at trace level in environmental samples prior to its flame atomic absorption spectrometric determination. The method is based on the sorption of lead after passing on modified Dowex sorbent in a column. The effect of several parameters such as pH, flow rate of sample, eluent kind and volume was investigated. The sorption capacity of the matrix has been found to be 0.4996 mg g of adsorbent with the preconcentration factor of 250 for Pb (II). Nitric acid (3 M) as an eluent was sufficient to obtain quantitative recovery (>95%) for Pb (II). The optimum flow rate was 10 ml min . The calibration curve was linear in the range of (3–250 ng mL) with a correlation coefficient of 0.9995. The limit of detection (LOD) based on three times the standard deviation of the blank was 1.37 ng mL. The relative standard deviation (RSD) for determination of 10 ng mL and 100 ngmL of Pb (II) was 3.00 % and 0.58 % (n = 10), respectively. The method was successfully applied to determination of lead in some environmental samples such as tap water, river water, soil and rice.
    International Journal of Environmental Analytical Chemistry 01/2012; · 1.24 Impact Factor
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    ABSTRACT: A simultaneous solid phase extraction procedure for enrichment of Cu(II), Cd(II) and Mn(II) has been developed. The method is based on adsorption of Cu(II), Cd(II) and Mn(II) ions on polyethylene glycol-silica gel pre-conditioned with acetate buffer (pH5.5). The adsorbed metal ions are eluted with nitric acid (1 mol L -1) and determined by flame atomic absorption spectrometry. The calibration graph was linear in the range of 2-140 ng mL-1 for Cu(II), 1-40 ng mL-1 for Cd(II) and 4-100 ng mL-1 for Mn(II). The limits of detection were 0.66, 0.33 and 1.20 ng mL-1 for Cu(II), Cd(II) and Mn(II), respectively.
    Química Nova 12/2011; 35(10):1945-1949. · 0.74 Impact Factor
  • N Pourreza, M Ghomi
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    ABSTRACT: A novel simultaneous cloud point extraction method for the determination of carmoisine and brilliant blue FCF by spectrophotometry has been developed. The method is based on the cloud point extraction of carmoisine and brilliant blue FCF from aqueous solution using Triton X-100, diluting the extracted surfactant rich phase with water and measuring the absorbance at 522 and 640 nm for carmoisine and brilliant blue FCF, respectively. The effects of different parameters such as pH, concentration of surfactant and temperature on the cloud point extraction of both dyes were investigated and optimum conditions were established. Linear calibration curves were obtained in the range of 0.02-3.50 μg mL(-1) for carmoisine and 0.05-3.50 μg mL(-1) for brilliant blue FCF under optimum conditions. Detection limit based on three times the standard deviation of the blank (3S(b)) was 0.017 and 0.016 μg mL(-1) (n=10) for carmoisine and brilliant blue FCF, respectively. The relative standard deviation (RSD) for 0.1 μg mL(-1) was 4.14 and 3.30% (n=10), for carmoisine and brilliant blue FCF, respectively. The method was applied to the simultaneous determination of the dyes in different food samples.
    Talanta 03/2011; 84(1):240-3. · 3.50 Impact Factor
  • N. Pourreza, S. Rastegarzadeh, A. Larki
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    ABSTRACT: A cloud point extraction process using mixed micelles of CTAB, Triton X-114 and Triton X-100 for preconcentration and spectrophotometric determination of trace amounts of Allura red in food samples was developed. The effect of different parameters such as concentration of surfactants, electrolyte concentration, temperature and pH on the cloud point extraction of Allura red was studied in detail and a set of optimum conditions were established. A linear calibration curve in the range of 20–1400μg/L of Allura red was obtained. Detection limit based on 3Sb was 7.8μg/L and the relative standard deviation for 75μg/L of Allura red was 3.87 (n=10). The method was applied to the determination of Allura red in food samples such as candy, soft drink and jellies.
    Food Chemistry - FOOD CHEM. 01/2011; 126(3):1465-1469.
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    ABSTRACT: A sensitive preconcentration procedure for spectrophotometeric determination of aluminum was developed. Aluminum as aluminon complex is adsorbed on microcrystalline naphthalene. The naphthalene containing the complex is dissolved in 3 mL of acetone and its absorbance is measured at 544 nm. The effect of various factors on the preconcentration of aluminum was investigated. The calibration graph was linear in the range of 1-60 mg L-1. The limit of detection was 0.52 mg L-1 and relative standard deviation for the determination of 5 mg L-1 was 2.65%. The proposed solid phase extraction procedure was applied to determination of aluminum in food samples.
    Química Nova 12/2010; 34(3):404-407. · 0.74 Impact Factor
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    ABSTRACT: In this paper a novel solid phase extraction method to determine Co(II) and Ni(II) using silica gel-polyethylene glycol (Silica-PEG) as a new adsorbent is described. The method is based on the adsorption of cobalt and nickel ions in alkaline media on polyethylene glycol-silica gel in a mini-column, elution with nitric acid and determination by flame atomic absorption spectrometry. The adsorption conditions such as NaOH concentration, sample volume and amount of adsorbent were optimized in order to achieve highest sensitivity. The calibration graph was linear in the range of 0.5-200.0ngmL(-1) for Co(II) and 2.0-100.0ngmL(-1) for Ni(II) in the initial solution. The limit of detection based on 3S(b) was 0.37ngmL(-1) for Co(II) and 0.71ngmL(-1) for Ni(II). The relative standard deviations (R.S.D.) for ten replicate measurements of 40ngmL(-1) of Co(II), and Ni(II) were 3.24 and 3.13%, respectively. The method was applied to determine Co(II) and Ni(II) in black tea, rice flour, sesame seeds, tap water and river water samples.
    Talanta 05/2010; 81(3):773-7. · 3.50 Impact Factor
  • N Pourreza, K Ghanemi
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    ABSTRACT: A novel solid phase extractor for preconcentration of cadmium at ng L(-1) levels has been developed. Cadmium ions were retained on a column packed with sulfur powder modified with 2-mercaptobenzothiazole (2-MBT) in the medium of 1-butyl-3-methylimidazolium hexafluorophosphate ([bmim](+)PF(6)(-)) ionic liquid. The presence of ionic liquid during modification of sulfur enhanced the retention of cadmium ions on the column. The retained cadmium ions were eluted with 2 mol L(-1) solution of HCl and measured by cold vapor generation-atomic absorption spectrometry (CVG-AAS). By using reaction cell-gas liquid separator (RC-GLS), gaseous cadmium vapors were produced and reached the atomic absorption spectrometer, instantaneously. The influence of different variables on both processes of solid phase extraction and CVG-AAS determination of cadmium ions was investigated. The calibration curve was linear in the range of 10-200 ng L(-1)of cadmium in the initial solution with r=0.9992 (n=8) under optimum conditions. The limit of detection based on three times the standard deviation of the blank (3S(b), n=10) was 4.6 ng L(-1). The relative standard deviation (R.S.D.) of 25 and 150 ng L(-1) of cadmium was 4.1 and 2.2% (n=8), respectively. The procedure was validated by the analysis of a certified reference material (DORM-3), water and fish samples.
    Journal of hazardous materials 02/2010; 178(1-3):566-71. · 4.14 Impact Factor
  • N. Pourreza, H. Parham, S. Shiri
    Journal of the Korean Chemical Society 01/2010; 54(3):283-286.
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    ABSTRACT: A method has been developed for the selective solid phase extraction of Pd(II) based on the adsorption of its 5(p-dimethylaminobenzylidene)rhodanine (PDR) complex on silica gel-polyethylene glycol (Silica-PEG) as a new synthesized adsorbent. The adsorbed complex was eluted using hydrochloric acid—acetone mixture and the concentration of Pd(II) was determined using flame atomic absorption spectrometry. The preconcentration conditions of analyte such as the effect of acid concentration, elution parameters, flow rate and adsorbent amount were investigated and optimized. The calibration curve was linear in the range of 2–80ngmL−1 with detection limit of 0.54ngmL−1 and the enrichment factor was 125 for a 250mL sample volume. The relative standard deviation of the method was <4%. The application of this new adsorbent to preconcentration and determination of palladium was estimated by using water, dust and ore samples spiked with different amounts of Pd(II). KeywordsPalladium-5(p-dimethylaminobenzylidene)rhodanine-Solid phase extraction-Silica gel-polyethylene glycol-Flame atomic absorption spectrometry
    Microchimica Acta 01/2010; 170(1):135-140. · 3.43 Impact Factor
  • S Rastegarzadeh, N Pourreza, I Saeedi
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    ABSTRACT: A selective method for the determination of thorium (IV) using an optical sensor is described. The sensing membrane is prepared by immobilization of thorin-methyltrioctylammonium ion pair on triacetylcellulose polymer. The sensor produced a linear response for thorium (IV) concentration in the range of 6.46 x 10(-6) to 9.91 x 10(-5)mol L(-1) with detection limit of 1.85 x 10(-6)mol L(-1). The regeneration of optode was accomplished completely at a short time (less than 20s) with 0.1 mol L(-1) of oxalate ion solution. The relative standard deviation for ten replicate measurements of 2.15 x 10(-5) and 8.62 x 10(-5)mol L(-1) of thorium was 2.71 and 1.65%, respectively. The optode membrane exhibits good selectivity for thorium (IV) over several other ionic species and are comparable to those obtained in case of spectrophotometric determination of thorium using thorin in solution. A good agreement with the ICP-MS and spiked method was achieved when the proposed optode was applied to the determination of thorium (IV) in dust and water samples.
    Journal of hazardous materials 09/2009; 173(1-3):110-4. · 4.14 Impact Factor