Nahid Pourreza

Shahid Chamran University of Ahvaz, Nāşerī, Khūzestān, Iran

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Publications (71)154.76 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: A sensitive, simple and novel method was developed to determine thiram fungicide in water and plant samples. This method was based on the interaction between gold nanoparticles (AuNPs) and thiram fungicide followed by increasing of the Resonance Rayleigh scattering (RRS) intensity of nanoparticles. The change in RRS intensity (∆IRRS) was linearly correlated to the concentration of thiram over the range of 1.0-200.0µgL(-1). Thiram can be measured in a short time (4min) without any complicated or time-consuming sample pretreatment process. Parameters that affect the RRS intensities such as pH, concentration of AuNPs, standing time, electrolyte concentration, and coexisting substances were systematically investigated and optimized. Interference tests showed that the developed method has a very good selectivity and could be used conveniently for the determination of thiram. The limit of detection (LOD) and limit of quantification (LOQ) were 0.3 and 1.0µgL(-1), respectively. Relative standard deviations (RSD) for 20.0 and 80.0µgL(-1) of thiram were 3.0 and 1.1, respectively. Possible mechanisms for the RRS changes of AuNPs in the presence of thiram were discussed and the method was successfully applied for the analysis of spiked real water samples and fresh plant samples such as tomato and cucumber. Copyright © 2015 Elsevier B.V. All rights reserved.
    Talanta 08/2015; 141. DOI:10.1016/j.talanta.2015.03.061 · 3.51 Impact Factor
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    ABSTRACT: In the present study, a simple, fast and inexpensive method based on dispersive liquid-liquid microextraction (DLLME) prior to microvolume UV-vis spectrophotometry was developed for the preconcentration and determination of trinitrotoluene (TNT). The procedure is based on the color reaction of TNT in alkaline medium and extraction into CCl4 as an ion pair assisted by trioctylmethylammonium chloride, which also acts as a disperser agent. Experimental parameters affecting the DLLME method such as pH, concentration of sodium hydroxide, amount of trioctylmethylammonium chloride, type and volume of extraction solvent were investigated and optimized. Under the optimum conditions, the limit of detection (LOD) was 0.9ng/mL and the calibration curve was linear in the range of 3-200ng/mL. The relative standard deviation for 25 and 100ng/mL of TNT were 3.7% and 1.5% (n=6), respectively. The developed DLLME method was applied for the determination of TNT in different water and soil samples. Copyright © 2015. Published by Elsevier Ireland Ltd.
    Forensic science international 06/2015; 251. DOI:10.1016/j.forsciint.2015.03.019 · 2.12 Impact Factor
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    ABSTRACT: In this work, nanoporous MCM-41 silicate was used for the Victoria blue adsorption and removal from the aqueous solutions. The properties of the synthesized MCM-41 were determined by X-ray diffraction analysis, transmission electron microscopy, and TGA analysis. The method is based on the adsorption of Victoria blue after passing on MCM-41 in a column. The adsorption with respect to contact time, pH, flow rate of sample, and initial concentration of analyte was investigated to provide more information about the adsorption characteristics of MCM-41. After adsorption of the dye, the concentrations of residual dye were determined by UV-Vis spectrophotometer. Adsorption process is well described by Langmuir and Temkin isotherms in comparison with Frundlich isotherm. Results suggested that the adsorption of Victoria blue on calcined MCM-41 was a spontaneous and endothermic process. The experimental data fitted very well with the pseudo-second-order kinetic model for Victoria blue onto calcined MCM-41. Adsorption capacity was found to be 192.3 mg g−1. The method was applied to the adsorption and removal of Victoria blue in different environmental water samples.
    Desalination and water treatment 02/2015; DOI:10.1080/19443994.2015.1005690 · 0.99 Impact Factor
  • N. Pourreza, M. R. Fat’hi, Z. Aghaii
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    ABSTRACT: A new sensitive solid phase extraction procedure has been developed for the separation and determination of thionine by spectrophotometry. In this method thionine is retained by agar as an adsorbent in a mini-column, eluted by sulfuric acid-acetone mixture and its absorbance is measured at 600 nm. The effect of different parameters such as pH, eluent type and volume, flow rate, amount of adsorbent and volume of sample on the adsorption was investigated and optimum conditions were established. The calibration graph was linear in the range of 3–100 ng/mL of thionine in the initial solution with r = 0.9984. Limit of detection (LOD) based on 3s b was 0.9 ng/mL and the relative standard deviation (RSD) for 20 ng/mL of thionine was 2.9%. The method was applied to the determination of thionine in water samples.
    Journal of Analytical Chemistry 01/2015; 70(1). DOI:10.1134/S1061934815010128 · 0.81 Impact Factor
  • Nahid Pourreza, Hamed Golmohammadi
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    ABSTRACT: This article describes the design and fabrication of a novel lab-on-paper device for pH sensing using curcumin nanoparticles (CURNs). In order to fabricate the lab-on-paper, the wax dipping method was used. The color of loaded paper with CURNs changed from yellow to orange and red to brown in the pH range of 7–13. The image of the lab-on-paper was taken by a digital camera and the picture was processed and analyzed using Adobe Photoshop software. The change in mean color intensity with pH was recorded and employed as an analytical signal for quantitative sensing of pH. The parameters affecting the pH sensor were optimized to enhance the selectivity and sensitivity of the method. Under optimum conditions, the mean color intensity was linearly proportional to the pH in the range of 8–13. The relative standard deviations of 10 replicate measurements of pH 9 and pH 12 were 2.3% and 1.5%, respectively. The developed sensor was successfully applied to the determination of pH in different water samples with satisfactory results.
    Talanta 01/2015; 131:136-141. DOI:10.1016/j.talanta.2014.07.063 · 3.51 Impact Factor
  • Nahid Pourreza, Hamed Golmohammadi
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    ABSTRACT: This article presents a simple and efficient measurement system for quantitative sensing of blood hemoglobin (Hgb) using curcumin nanoparticle (CURNs). The Hgb monitoring is based on CURNs aggregation in the presence of Hgb, which leads to a decrease in the absorption intensity of CURNs. In this study the analytical signal for the measurement of blood Hgb concentration was defined as the difference in absorption intensity of the CURNs in the absence and presence of Hgb. The method was optimized to enhance the selectivity and sensitivity of the method by investigating the effect of variables such as pH of the sample solution, buffer concentration, required amount of CURNs, equilibrium time and tolerance limit of various probable interferences. Under optimum conditions, the difference in absorption intensity of the CURNs was linearly proportional to the concentration of Hgb in two ranges of 1-40 µg mL-1 and 150-1200 µg mL-1 with a detection limit of 0.1 µg mL-1. The relative standard deviation for ten replicate measurements of 20 µg mL-1 and 600 µg mL-1 of Hgb was 3.6% and 3.1% respectively. The sensing method was successfully applied for the measurement of Hgb in human blood with satisfactory results.
    RSC Advances 11/2014; 5(3). DOI:10.1039/C4RA10386F · 3.71 Impact Factor
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    ABSTRACT: This article presents a new and sensitive method for the determination of trace amounts of fungicide carbendazim by dispersive liquid–liquid microextraction (DLLME) combined with UV–vis spectrophotometry. The method is based on the reduction of Fe(III) to Fe(II) by carbendazim, its reaction with potassium ferricynide to form a blue product and extraction into CCL4 by DLLME technique using methyltrioctylammonium chloride (Aliquat 336) as a disperser agent. Under the established optimum conditions, the calibration graph was linear in the range of 5–600 ng mL−1 of carbendazim with a limit of detection of 2.1 ng mL−1. The relative standard deviations for eight replicate determinations of 50 and 300 ng mL−1 of carbendazim were 3.9% and 1.0%, respectively. The proposed method was successfully applied to determination of carbendazim in soil and water samples.
    Talanta 11/2014; 134. DOI:10.1016/j.talanta.2014.10.056 · 3.51 Impact Factor
  • Nahid Pourreza, Tina Naghdi
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    ABSTRACT: A new approach is presented in this paper by using dispersed TiO2 nanoparticles (TiO2-NPs) in a combined cloud point and solid phase extraction for the efficient preconcentration and determination of Zn(2+) in various samples. In this method Zn(2+) ions are adsorbed on TiO2-NPs and transferred into surfactant rich phase. Subsequently the Zn(2+) ions are desorbed from TiO2-NPs by a dithizone solution via forming a color complex which could be detected colorimetrically. The influence of chemical variables such as pH of the sample solution, electrolyte, amount of TiO2-NPs, type and volume of the eluent on the extraction system was studied. The calibration graph was linear in the range of 0.5-90.0µgL(-1) of Zn(2+) (r=0.9996). An enrichment factor of 80 was achieved and the limit of detection for Zn(2+) was 0.33µgL(-1). The relative standard deviation (RSD) for eight replicate measurements of 10µgL(-1) and 60µgL(-1) of Zn(2+) was 1.8% and 1.5% respectively. The proposed method was successfully applied to the quantitative determination of Zn(2+) in tap water, powder milk and Zinc sulfate tablet with satisfactory results.
    Talanta 10/2014; 128:164–169. DOI:10.1016/j.talanta.2014.04.073 · 3.51 Impact Factor
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    ABSTRACT: In this work, β-CD-based polyurethane copolymers (β-CDPU) have been prepared by reacting β-CD with hexamethylene diisocyanate as cross-linked agent in dry DMF. This polymer showed high selectivity for preconcentration of Pb(II) at trace level prior to its flame atomic absorption spectrometric determination. The effect of several parameters such as pH, flow rate of sample, eluent kind and volume was investigated. The adsorption behaviors and mechanisms of Pb(II) on the samples were also studied. The maximum adsorption amount of Pb(II) was 8 mg g−1 with the preconcentration factor of 250 for Pb(II). The Langmuir isotherm was proved to describe the adsorption data better than the Freundlich isotherm and a pseudo-first-order kinetic model fits the adsorption kinetic processes well. The calibration curve was linear in the range of (3–200 ng mL−1) with a correlation coefficient of 0.9996. The limit of detection based on three times the standard deviation of the blank was 1.15 ng mL−1. The relative standard deviations for the determination of 10 and 100 ng mL−1 of Pb(II) were 3.60 and 0.43 % (n = 10), respectively. The method was successfully applied to the determination of lead in some environmental samples such as Tehran and Bushehr drinking water, river water and dust samples.
    Research on Chemical Intermediates 10/2014; 40(8). DOI:10.1007/s11164-013-1120-5 · 1.54 Impact Factor
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    ABSTRACT: A fast and reliable dispersive liquid-liquid microextraction (DLLME) method for the determination of trace levels of silver by flame atomic absorption spectrometry (FAAS) was developed. The method is based on highly-efficient separation and preconcentration of silver by the complex formation of Ag(I) with 2-mercaptobenzimidazole and extracted by DLLME procedure using carbon tetrachloride as extraction and acetone as disperser solvent. After establishment of a cloudy solution, the phase separation is achieved and Ag(I) is determined in the enriched phase by FAAS. The method yields a linear calibration curve in the concentration range of 1-100 ng mL−1 of Ag(I), and the limit of detection is 0.41 ng mL−1. The proposed method was successfully applied to determine the trace amounts of silver in water, radiology film processing wastewater and ore samples.
    Journal of Industrial and Engineering Chemistry 10/2014; 24. DOI:10.1016/j.jiec.2014.09.045 · 2.06 Impact Factor
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    N. Pourreza, S. Rastegarzadeh, A. Larki
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    ABSTRACT: Nano-TiO2 modified with 2-mercaptobenzothiazole (MBT) was investigated as a new adsorbent for preconcentration of Cd(II), Cu(II) and Pb(II). The metal ions are adsorbed onto nano-TiO2-MBT, eluted by nitric acid and determined by flame atomic absorption spectrometry. The parameters affecting the adsorption were investigated. Under optimized conditions, the calibration curves were linear in the range of 0.2-25.0, 0.2-20.0, and 3.0-70.0 ng mL(-1) for cadmium, copper and lead, respectively. The limits of detection for Cd(II), Cu(II) and Pb(II) were 0.12, 0.15 and 1.38 ng mL(-1), respectively. The method was applied to determination of Cd(II), Cu(II) and Pb(II) in water and ore samples.
    Journal of Industrial and Engineering Chemistry 09/2014; 20(5):2680–2686. DOI:10.1016/j.jiec.2013.10.055 · 2.06 Impact Factor
  • Nahid Pourreza, Mohammad Reza Fat'hi, Ali Hatami
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    ABSTRACT: A cloud point extraction (CPE) method for determination of trace amounts of penicillin G by spectrophotometry based on its effect on the triiodide ion (I3–) has been developed. Penicillin G is converted to the corresponding penicilloic acid by carrying out hydrolysis with sodium hydroxide solution, and treatment with acid yields D-penicillamine that is oxidized quantitatively by iodine to give rise to a disulfide. The I3– remaining in the solution is extracted into the surfactant Triton X-100, and the difference between absorbance of the working solution in the presence and absence of penicillin G is proportional to the amount of penicillin G. The effects of different variables, such as concentrations of sodium hydroxide, hydrochloric acid, surfactant, and I3– and the temperature and incubation time on the CPE were studied. The calibration graph was linear in the range of 50–1250 μg/L, and the LOD was 38 μg/L (n = 10). The RSD for 10 replicate determinations of 1000 μg/L of penicillin G was 1.0%. The method was applied to the determination of penicillin G in milk samples.
    Journal of AOAC International 08/2014; 97(4). DOI:10.5740/jaoacint.13-113 · 1.39 Impact Factor
  • 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). DOI:10.1007/s13738-013-0343-0 · 1.41 Impact Factor
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    ABSTRACT: A new dispersive liquid–liquid microextraction (DLLME) method coupled with microvolume UV-vis spectrophotometry was developed for the determination of trace amounts of bismuth. The method is based on the complex formation of Bi(III) with iodide (BiI4�) and extraction into carbon tetrachloride as an ion pair. The extraction is assisted by methyltrioctylammonium chloride, which also acts as a disperser agent. The effect of important parameters, such as the concentration of sulfuric acid and iodide in the sample solution, the amount of methyltrioctylammonium chloride, and the type and volume of extraction solvent were investigated and optimized. The present method is capable of determining bismuth in the concentration range of 5 to 400 ng mL�1 with a limit of detection (LOD) of 1.6 ng mL�1. The relative standard deviation for eight replicate measurements of Bi(III) at concentrations of 200 and 75 ng mL�1 was calculated to be 1.14 and 2.66%, respectively. The developed method was successfully applied to the determination of bismuth in bismuth subcitrate tablets and human serum samples.
    Analytical methods 04/2014; 6(10):3500. DOI:10.1039/c4ay00526k · 1.94 Impact Factor
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    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 02/2014; 119:181–186. DOI:10.1016/j.talanta.2013.11.005 · 3.51 Impact Factor
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    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. DOI:10.1016/j.jiec.2013.04.016 · 2.06 Impact Factor
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    Nahid Pourreza
    11/2013; 8(4):149-50.
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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. DOI:10.1016/j.saa.2013.05.020 · 2.13 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. DOI:10.1080/10739149.2012.729242 · 0.80 Impact Factor
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    ABSTRACT: A new solid phase extraction method for the separation and determination of zirconium using agar as an adsorbent is described. The method is based on the adsorption of zirconium as arsenazo(III) complex on agar in a mini-column, elution with sulfuric acid-acetone mixture and determination by spectrophotometry. The effect of different parameters such as pH, concentration of the reagent, eluting reagent, and volume of the sample, amount of the adsorbent and interfering ions was investigated. The calibration graph was linear in the range of 5–300 ng ml−1 of zirconium under optimum conditions. The limit of detection based on 3Sb was 1.3 ng ml−1 and the relative standard deviation (R.S.D) for ten replicate measurements of 15 and 200 ng ml−1 of zirconium was 3.7 and 1.8%, respectively. The method was applied to the determination of zirconium in water and soil samples.
    Journal of the Iranian Chemical Society 12/2012; 8(4). DOI:10.1007/BF03246550 · 1.41 Impact Factor