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Indirect Spectrophotometric Determination of Trace Quantities of Hydrazine
Haji Shabani, A.M.,Dadfarnia, S.,Dehghan, K. Korean Chemical Society 2004 Bulletin of the Korean Chemical Society Vol.25 No.2
An indirect, sensitive and accurate method for the determination of trace amounts of hydrazine is described. The method is based on the oxidation of hydrazine by a known excess of iodate in the presence of hydrochloric acid. The unreacted iodate is used in the oxidation of hydroxylamine to nitrite. Sulfanilic acid is diazotized by the nitrite formed. The resulting diazonium ion is coupled with N-(1-naphthyl)ethylenediamine to form a stable azo dye, which shows an absorption maximum at 540 nm. Hydrazine can be determined in the range of 20-400 ng $mL^{-1}$ with a detection limit of 3.1 ng $mL^{-1}$. The relative standard deviation for 50, 200 and 400 ng $mL^{-1}$ of hydrazine is 2, 1.5 and 1.3%, respectively (n = 10). The method was applied to the determination of hydrazine in water samples.
Dadfarnia, S.,Haji Shabani, A.M.,Dehgan Shirie, H. Korean Chemical Society 2002 Bulletin of the Korean Chemical Society Vol.23 No.4
A simple and rapid technique for the separation and preconcentration of lead in water and biological samples has been devised. Preconcentrationis based on the depositionof analyte onto a column packed with dithizone immobilized on sodium dodecyl sulfate coated alumina at pH $\geq$ 3. The trapped lead is eluted with 5 mL of 4 M nitric acid and determined by flame atomic absorption spectroscopy. A sample of 1 L, results in a preconcentration factor of 200 and the precision at 20${\mu}g$ $L^{-1}$ is 1.3%(n=8). The procedure is applied to tap water, well water, river water, vegetable extract and milk samples, and accuracy is assessed through recovery experiments and by independent analysis by furnace atomic absorption.
Dadfarnia, Shayessteh,Salmanzadeh, Ali Mohammed,Haji Shabani, Ali Mohammed Korean Chemical Society 2002 Bulletin of the Korean Chemical Society Vol.23 No.12
1,5-diphenylcarbazone was immobilized on sodium dodecyl sulfate coated alumina. The alumina particle was effectively used for collection of mercury(II) and methylmercury cations at sub-ppb level. The adsorbed mercury was eluted with l mol $L^{-1}$ of hydrobromic acid solution. The mercury(II) was then directly measured by cold vapor atomic absorption spectrometry utilizing tin (II) chloride where as the total mercury was determined after the oxidation of methylmercury into the inorganic mercury. The methylmercury concentration was calculated by the difference between the value of total mercury and mercury (II). Mercury (II) and methylmercury cations were completely recovered from water with a preconcentration factor of 100 (for 1 L solution.) Relative standard deviation at Hg L ${\mu}gL^{-1}$ level 1.7%(n=8) and the limit of detection was 0.11 ${\mu}gL^{-1}$. The procedure was applied to spring water, well water and seawater and accuracy was assessed through recovery experiments.
Asma Barati,Elahe Kazemi,ShayesstehDadfarnia,Ali Mohammad Haji Shabani 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.46 No.-
A novel molecular imprinted polymer (MIP) as a SPE sorbent was synthesized for fluoxetine througha coprecipitation method. The synthesized polymer was characterized by Fourier transform infrared(FT–IR) spectroscopy and scanning electron microscopy (SEM). The kinetic and adsorption equilibriumwas studied. Quantification of fluoxetine was done based on the competitive inclusion complexformation of fluoxetine with phenolphthalein-b-cyclodextrin using fiber optic linear array spectrophotometry. The method exhibited a linear dynamic range of 0.8–10.0 mg L 1[1TD$DIF] with a detection limit of0.03 mg L 1 and a preconcentration factor of 500. The developed method was successfully applied todetermine fluoxetine in various samples.
Shakerian, F.,Kim, K.H.,Kwon, E.,Szulejko, J.E.,Kumar, P.,Dadfarnia, S.,Haji Shabani, A.M. Elsevier Scientific Pub. Co 2016 Trends in analytical chemistry Vol.83 No.2
<P>Over the past several decades, much progress has been made in the development of ion-imprinted polymers (IIPs) with the aid of novel types of tailored polymeric materials (e.g., nanomaterials and hybrid materials). Because of such efforts, IIPs are now widely employed as advanced analytical tools in a variety of sectors (e.g., as sorbents for solid phase extraction of metal ions). Recently, due to the advancement of polymeric materials (PMs), an increased number of studies have been made to expand the practical applicability of IIPs. In this review, the basic theories involved in the polymerization methods of IIPs are described along with their synthesis and diverse fields of applications (e.g., solid phase extraction (SPE), sensors, and membrane separators). (C) 2016 Elsevier B.V. All rights reserved.</P>