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RISS 인기검색어
- 검색키워드
- 저자 : Nahid Pourreza (검색결과 4 건)
- 무료
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Nahid Pourreza,Parichehr Abasipanah,Matineh Ghomi 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.100 No.-
A simple process was developed for the fabrication of alginate biopolymerfilm embedded by thiourea-functionalized AuNPs (thiourea/AuNPs) for palladium(II) detection. A mixture of sodium alginate andHAuCl4 was prepared as the main matrix and the AuNPs were in situ synthesized in alkali media providedby borax. The AuNPs entrapped in the alginate network were functionalized by thiourea and fabricated asa transparentfilm. The characteristics of thiourea/AuNPs alginate biopolymerfilm were investigated byTransmission electron microscopy (TEM), Energy dispersive X-ray analysis (EDX) and UV–visspectrophotometry. The UV–vis absorption spectrum showed the maximum wavelength of thiourea/AuNPs was at 530 nm. The effect of various parameters such as pH and thiourea concentration on thesensing of palladium(II) ions was investigated. The prepared alginate biopolymerfilm showed goodstability over the time. The calibration graph was linear in the range of 0.05 2.10 mg mL 1 with adetection limit of 0.038 mg mL 1. The relative standard deviation (n = 10) for 0.6 and 1.2 mg mL 1 ofpalladium(II) was 4.6% and 3.5%, respectively. The sensing system was successfully applied for thedetermination of palladium in walnut leaves, wastewater, dental amalgam, and ceramic capacitorsamples.
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Nahid Pourreza,Tina Naghdi 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.5
Silicon carbide nanoparticles were applied as a new solid phase adsorbent for preconcentration of lead ions. Pb(II) ions are adsorbed on silicon carbide nanoparticles, eluted with nitric acid and determined by flame atomic absorption spectrometry. The solid phase extraction conditions were optimized. The calibration graph was linear in the range of 2–150 ng mL-1 (r = 0.9995) with a detection limit of 0.4 ng mL-1. The relative standard deviation for eight measurements of 20 ng mL-1 of Pb(II) was 1.3%. The adsorption capacity was 156.2 mg g-1of Pb(II). The method was applied to determination of Pb(II) in different samples.
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Nahid Pourreza,Tina Naghdi 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.51 No.-
In this paper D-limonene and b-carotene are introduced as two natural products in a dispersive liquid–liquid microextraction (DLLME) method for spectrophotometric determination of b-cyclodextrin (b-CD). Dissolved b-carotene in D-limonene exhibits strong absorption exhibits strong absorption intensity afterperforming. The absorption intensity of the extracted phase is increased in the presence of b-CD due to itsinteraction (complex formation) with b-carotene. This increase in the absorbance of the extracted phaseis related to the b-CD concentration and was utilized as an analytical signal for determination of b-CD. The effect of chemical variables such as pH of the sample solution, nature and volume of dispersivesolvent, volume of extraction solvent and extraction time on the DLLME method was studied andoptimum conditions were established. The calibration curve was linear in the range of 110 4–6 10 3 mol L 1 (r = 0.9956) with a limit of detection 410 5 mol L 1. The relative standard deviation foreight replicate determinations of 110 3 mol L 1 and 510 3 mol L 1 of b-CD was 1.82% and 0.88%respectively. The proposed method was successfully applied to the determination of b-CD in spikedwater and pharmaceutical samples and good recoveries in the range of 94.2–108.0% were obtained.
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Saadat Rastegarzadeh,Nahid Pourreza,Arash Larki 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.24 No.-
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 mL1 of Ag(I), and the limit of detection is 0.41 ng mL1. The proposed method was successfully applied to determine the trace amounts of silver in water, radiology film processing wastewater and ore samples.
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