Zarrin Es’haghi; Fatemeh Moeinpour
Volume 1, Issue 2 , September 2014, Pages 58-64
Abstract
An efficient separation-preconcentration procedure namely hollow fiber solid/liquid phase microextraction (HF-SLPME) was developed for determination of trace amounts of palladium in water samples by differential pulse voltammetry. In this method, a hybrid sorbent utilizing functionalized nanoparticles ...
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An efficient separation-preconcentration procedure namely hollow fiber solid/liquid phase microextraction (HF-SLPME) was developed for determination of trace amounts of palladium in water samples by differential pulse voltammetry. In this method, a hybrid sorbent utilizing functionalized nanoparticles incorporated in an organic solvent was used as the extractor phase. The nanoparticle dispersed in the organic solvent is held in the pores and lumen of a porous polypropylene hollow fiber. It is in contact directly with the aqueous donor phase. The influence of the various analytical parameters such as pH, kind and amounts of nanoparticle and matrix effects, sample volume, extraction time, etc. were studied for the quantitative recoveries of the analyte ions. Under the optimized experimental conditions, the calibration curves for Pd (II) was linear from 0.1 to 500 ng/mL. The relative standard deviation for seven replicate determinations of 0.1 mg/mL palladium in the standard solutions was 3.95 %. The detection limit based on 3Sb for Pd (II) in the standard solutions was 0.01 ng/mL. The proposed method has been applied for determination of trace amounts of palladium in the real water samples and satisfactory results were obtained.
Mohammad Reza Hadjmohammadi; Maede Asadi
Volume 1, Issue 2 , September 2014, Pages 65-71
Abstract
The applicability of hollow fiber-based liquid phase microextraction (HF-LPME) was evaluated for the extraction and preconcentration of Loratadine prior to determination by HPLC. In order to obtain high extraction recovery, the parameters affecting the HF-LPME including type of organic phase, pH of the ...
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The applicability of hollow fiber-based liquid phase microextraction (HF-LPME) was evaluated for the extraction and preconcentration of Loratadine prior to determination by HPLC. In order to obtain high extraction recovery, the parameters affecting the HF-LPME including type of organic phase, pH of the source and receiving phases, stirring rate, extraction time and salt addition were studied and optimized. Under the optimized conditions, enrichment factor of 308 with relative standard deviation (R.S.D.%) equel 3.8% were achieved. The calibration curve was linear in the range of 0.3–600 ng/ml with good linearity (R2 = 0.9991). The limit of detection (LOD) was 0.1 ng/ml (based on S/N = 3). Finally, determination of Loratadine in human plasma was used by HF-LPME-HPLC and indicated that this method had an excellent clean-up and high recovery factor (84%) for Loratadine.
Maryam Malekzadeh; Faeze Daneshfar; Seyed Mohsen Sadeghzadeh
Volume 1, Issue 2 , September 2014, Pages 72-77
Abstract
Nano SiO2/hyperbranched polyglycerol (HPG)/SO3H catalyst was readily prepared for first time from inexpensive starting materials in aqueous media which catalyzed the synthesis of benzoic acid. FTIR spectra, X-ray diffraction (XRD) and transmission electron micrographs (TEM) was employed to characterize ...
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Nano SiO2/hyperbranched polyglycerol (HPG)/SO3H catalyst was readily prepared for first time from inexpensive starting materials in aqueous media which catalyzed the synthesis of benzoic acid. FTIR spectra, X-ray diffraction (XRD) and transmission electron micrographs (TEM) was employed to characterize the properties of the synthesized nano SiO2/HPG/SO3H. High catalytic activity and ease of recovery from the reaction mixture using filtration and several reuse times without significant losses in performance are additional eco-friendly attributes of this catalytic system.
Sedigheh Kamran; Hossein Tavallali; Ali Azad
Volume 1, Issue 2 , September 2014, Pages 78-86
Abstract
Fe3O4 magnetic nanoparticles modified with 1-Octyl-3-methylimidazolium bromide([C8MIM]-Fe3O4) were used for the removal of reactive red 141 (RR141) and reactive yellow 81 (RY81) as model azo dyes from aqueous solution. The mean size and the surface morphology of the nanoparticles were characterized by ...
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Fe3O4 magnetic nanoparticles modified with 1-Octyl-3-methylimidazolium bromide([C8MIM]-Fe3O4) were used for the removal of reactive red 141 (RR141) and reactive yellow 81 (RY81) as model azo dyes from aqueous solution. The mean size and the surface morphology of the nanoparticles were characterized by TEM, XRD and FTIR techniques. Adsorption studies of two dyes were performed under different experimental conditions in batch technique. The adsorption of dyes onto [C8MIM]-Fe3O4 nanoparticles was affected by the initial pH, dye concentration, adsorbent amount, contact time and temperature. Experimental results indicated that [C8MIM]-Fe3O4 nanoparticles removed more than 98%. The maximum adsorption capacity of [C8MIM]-Fe3O4 for the Langmuir model was 71.4 mg g−1 and 62.5 mg g−1 for RR141 and RY81, respectively. The isotherm evaluations revealed that the Langmuir model attained better fits to the equilibrium data than the Freundlich model. Adsorption processes onto [C8MIM]-Fe3O4 nanoparticles were spontaneous exothermic and endothermic for RY81 and RR141, respectively. Dyes were desorbed from nanoparticlesby NaCl solution 0.1 mol L−1 at 80 and 30 °C for RR141 and RY81, respectively.
Hossein Tavallali; Gohar Deilamy-Rad; Hoda Ansari
Volume 1, Issue 2 , September 2014, Pages 87-96
Abstract
A novel magnetic mixed hemimicell solid phase extraction (MMHSPE) technique for speciation analysis of soluble, ferrous and ferric iron in legumes sample by flame atomic absorption spectrometry analysis (FAAS) was developed. MMHSPE system consisting of alumina-coated magnetite nanoparticles (Fe3O4/Al2O3NPs) ...
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A novel magnetic mixed hemimicell solid phase extraction (MMHSPE) technique for speciation analysis of soluble, ferrous and ferric iron in legumes sample by flame atomic absorption spectrometry analysis (FAAS) was developed. MMHSPE system consisting of alumina-coated magnetite nanoparticles (Fe3O4/Al2O3NPs) modified by sodium dodecylsulfate-1-(2-pyridylazo)-2-naphthol (SDS-PAN) have been successfully synthesized as an extracting agent. The procedure is based on complexation of Fe(II) with PAN that immobilized on the SDS-coated Fe3O4/Al2O3 NPs. Total iron is subjected to a similar extraction procedure after reduction. Then Fe(III) has been calculated by subtracting Fe(ΙI) from the total iron. The new and rapid method of analyses (MMHSPE technique) has been successfully applied for the determination of iron ions in certified reference materials (NCS DC 73349—bush, branches and leaves; and TM-23.2—fortified water) and legumes samples with high efficiency. Under the optimum conditions of parameters, the recoveries of Fe(ΙI) by analyzing the seven spiked some legumes samples were between 96.0% and 103.6% and detection limits of Fe(ΙI) were between 1.7 and 3.1 ng mg−1. The results have been also indicated that Fe3+ concentrations obtained are always higher than the Fe2+ contents in legumes sample and Soy bean snack and Peanut have the maximum content of Fe2+.
Sandeep Jaggi; Usha Gupta
Volume 1, Issue 2 , September 2014, Pages 97-105
Abstract
A simple and sensitive method has been developed for the preconcentration and determination of trace level of Co(II) using UV-Vis spectrophotometry. β-Cyclodextrin polymer modified with 1-(2-pyridylazo)-2-naphthol (PAN) is used for the preconcentration of Co(II) from samples at pH 8.5. The polymer ...
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A simple and sensitive method has been developed for the preconcentration and determination of trace level of Co(II) using UV-Vis spectrophotometry. β-Cyclodextrin polymer modified with 1-(2-pyridylazo)-2-naphthol (PAN) is used for the preconcentration of Co(II) from samples at pH 8.5. The polymer is synthesized and characterized using elemental analysis, FT-IR and SEM analysis. The factors affecting the recovery of Co(II) such as pH, adsorbent dose, contact time, sample volume, eluent concentration and volume are also optimized in order to achieve higher sensitivity. The recoveries of Co(II) are found to be 95% and the relative standard deviation found by analyzing 3 replicates is ≤2.9. The preconcentration factor is found to be 100. The limit of detection (LOD) determined as (3σ) is found to be 4.2 ng/ml and limit of quantification (LOQ) determined as (10σ) is found to be 14 ng/ml. The recoveries achieved by addition of Co(II) at known concentrations to samples and analysis results show that the described method has a good accuracy. The proposed method is applied to water, vegetable and alloy samples successfully.
Reyhaneh Rahnama; Sorour Eram
Volume 1, Issue 2 , September 2014, Pages 106-114
Abstract
A new method for the separation and preconcentration of trace amounts of cadmium in food and water samples by magnetic solid phase extraction (MSPE) with Fe3O4 magnetic nanoparticles (Fe3O4-MNPs) and its determination by flame atomic absorption spectrometry has been developed. For this purpose, Fe3O4-MNPs ...
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A new method for the separation and preconcentration of trace amounts of cadmium in food and water samples by magnetic solid phase extraction (MSPE) with Fe3O4 magnetic nanoparticles (Fe3O4-MNPs) and its determination by flame atomic absorption spectrometry has been developed. For this purpose, Fe3O4-MNPs were synthesized via chemical precipitation method. The extraction of cadmium ions from the aqueous solution was performed with dithizone (DTZ) as the chelating agent. The various parameters affecting the extraction and preconcentration of cadmium were investigated and optimized. In this method, the analyte ions were quantitatively adsorbed on Fe3O4-MNPs and then, Fe3O4-MNPs were easily separated from the aqueous solution by applying an external magnetic field. After extraction and collection of Fe3O4-MNPs, the analyte ions were eluted using 1.0 mol L-1 HNO3 in methanol. Under the optimal conditions, the calibration curve showed an excellent linearity in the concentration range of 0.3–24.0 µg L-1 and the limit of detection was 0.1 µg L-1 of cadmium. The developed method was successfully applied to the determination of cadmium in food and water samples. The results show that, magnetic nanoparticles can be used as a cheap and efficient adsorbent for the extraction and preconcentration of cadmium from real samples for Loratadine.
Soleyman Bahar; Bahare Babamiri
Volume 1, Issue 2 , September 2014, Pages 115-120
Abstract
In this work, a procedure for preconcentration of cobalt using dispersive liquid–liquid microextraction (DLLME) with the reagent 1-Nitroso 2-naphtol as complexing reagent was developed. At pH 4, Co(II) was complexed with 1-nitroso 2-naphtol and extracted into the fine droplets formed when mixing ...
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In this work, a procedure for preconcentration of cobalt using dispersive liquid–liquid microextraction (DLLME) with the reagent 1-Nitroso 2-naphtol as complexing reagent was developed. At pH 4, Co(II) was complexed with 1-nitroso 2-naphtol and extracted into the fine droplets formed when mixing chloroform (extraction solvent), ethanol (disperser solvent) and the sample solution. After extraction, the phases are separated and cobalt ion was determined in the enriched phase by flame atomic absorption spectrometry (FAAS). Under the optimum conditions, the enrichment factor 57.22 was obtained. The detection limit of the method was 3.76 ng mL-1 and the relative standard deviation (RSD) for eight replicate mrasurements of 0.05 µg mL-1 Co (II) was 2.3 %. The results to the determination of Co(II) in environmental water samples (tap water, well water, mineral water), egg yolk and hair have demonstrated the applicability of the proposed method.
Khalilollah Taheri; Nahid Rahneshan
Volume 1, Issue 2 , September 2014, Pages 121-125
Abstract
A number of researches have been performed in the field of elemental analysis of fruitsfrom different areas of Iran and there is a vast unstudied area in this field. In this study, seven mineral elements such as Na, K, Ca, Mg, Fe, Zn and Cu in the tree soil, citrus limunum juice of Gorgan and Iranshahr ...
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A number of researches have been performed in the field of elemental analysis of fruitsfrom different areas of Iran and there is a vast unstudied area in this field. In this study, seven mineral elements such as Na, K, Ca, Mg, Fe, Zn and Cu in the tree soil, citrus limunum juice of Gorgan and Iranshahr gardens and citrus limetta juice of Gorgan and Bandarabas gardens were determined by flame photometry and atomic absorption spectrometry methods using standard addition technique. The results showed that the concentration of K and Cu elements in the samples of fruits was higher and lower than other elements, respectively. The concentration of Na and K elements in the citrus limetta sample of Bandarabas was more than that of the Gorgan sample. The concentration of Fe and Mg elements in the citrus limunum sample of Gorgan was more than that of the Iranshahr sample. The measurments showed that the concentration of Ca and Zn elements in the tree soil samples of citrus limunum, was higher and lower than the other elements, respectively. Moreover, although the concentration of the Ca element in the soil sample of Gorgan was more than that of Iranshahr, the concentration of this element in the citrus limunum of Gorgan was less than that of Iranshahr, this is probably due to problems in the Ca absorption of the citrus limunum plant of Gorgan. The obtained information in this study can be useful for some patients in the preferred consumption of these kinds of fruits. In addition, the used methods are reliable and simple analytical procedures for the mineral element characterisation of citrus limunum and citrus limetta fruits.
