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Madrakian, Tayyebeh,Afkhami, Abbas,Mohammadnejad, Masoumeh Korean Chemical Society 2009 Bulletin of the Korean Chemical Society Vol.30 No.6
A simple, selective and sensitive fluorescence quenching method was developed to the determination Cr(VI). The method is based on the oxidation of $I^-\;to\;{{I_3}^-}$ by Cr(VI) in sulfuric acid solution followed by immediate formation of ion association compound between I3 − and rhodamine 6G in Tween-80 micellar media at room temperature. The influence of several surfactants on rhodamine 6G fluorescence signal was studied; particular attention was paid in the aggregation behavior of rhodamine 6G–Tween-80 system. The experimental parameters (e.g., type of surfactant, reagent concentration) were studied and the optimal conditions were established. The linear calibration graph was obtained in the range 2.0 - 100.0 ng m$L^{-1}$ Cr(VI). The detection limit of the method was 0.37 ng m$L^{-1}$. The relative standard deviation (R.S.D.) is less than 5% (n = 5). The efficiency of the method for the determination of Cr(VI) in the presence of Cr(III) in the sample was investigated. The method was applied successfully to the determination of Cr(VI) and total Cr in water, and liver tissue samples.
Tayyebeh Madrakian,Abbas Afkhami,Masoumeh Mohammadnejad 대한화학회 2009 Bulletin of the Korean Chemical Society Vol.30 No.6
A simple, selective and sensitive fluorescence quenching method was developed to the determination Cr(VI). The method is based on the oxidation of I− to I3− by Cr(VI) in sulfuric acid solution followed by immediate formation of ion association compound between I3− and rhodamine 6G in Tween-80 micellar media at room temperature. The influence of several surfactants on rhodamine 6G fluorescence signal was studied; particular attention was paid in the aggregation behavior of rhodamine 6G–Tween-80 system. The experimental parameters (e.g., type of surfactant,reagent concentration) were studied and the optimal conditions were established. The linear calibration graph was obtained in the range 2.0 - 100.0 ng mL-1 Cr(VI). The detection limit of the method was 0.37 ng mL-1. The relative standard deviation (R.S.D.) is less than 5% (n = 5). The efficiency of the method for the determination of Cr(VI) in the presence of Cr(III) in the sample was investigated. The method was applied successfully to the determination of Cr(VI) and total Cr in water, and liver tissue samples
Tayyebeh Madrakian,Abbas Afkhami,Borhan Zadpour,Mazaher Ahmadi 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.21 No.1
A maghemite nanoparticles modified with homopolymers of a new mercaptoethylamino monomer(MAMNPs) have been prepared. The MAMNPs nanoparticles were fully characterized by FT-IR, XRD, BETand TEM measurements. The influences of parameters including pH, dosage of adsorbent and contacttime have been investigated in order to find the optimum adsorption conditions. Metal ions adsorptionprocess was thoroughly studied from both kinetic and equilibrium points of view. MAMNPs showed hightendency to investigated metal ions, in this order: Ag(I) > Hg(II) > Pb(II) > Cd(II), owing to the strongcontribution of surface loaded polymer.
Afkhami, Abbas,Sarlak, Nahid,Zarei, Ali Reza,Madrakian, Tayyebeh Korean Chemical Society 2006 Bulletin of the Korean Chemical Society Vol.27 No.6
The partial least squares (PLS-1) calibration model based on spectrophotometric measurement, for the simultaneous determination of sulfite and sulfide is described. This method is based on the difference between the rate of the reaction of sulfide and sulfite with Malachite Green in pH 7.0 buffer solution and at 25 ${^{\circ}C}$. The absorption kinetic profiles of the solutions were monitored by measuring the decrease in the absorbance of Malachite Green at 617 nm in the time range 10-180 s after initiation of the reactions with 2 s intervals. The experimental calibration matrix for partial least squares (PLS-1) calibration was designed with 24 samples. The cross-validation method was used for selecting the number of factors. The results showed that simultaneous determination could be performed in the range 0.030-1.5 and 0.030-1.2 $\mu$g m$L ^{-1}$ for sulfite and sulfide, respectively. The proposed method was successfully applied to simultaneous determination of sulfite and sulfide in water samples and whole human blood.
Abbas Afkhami,Shadieh Sayari,Razieh Moosavi,Tayyebeh Madrakian 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.21 No.1
Nickel zinc ferrite nanocomposite was synthesized and characterized by X-ray diffraction (XRD) analysisand scanning electron microscopy (SEM). The XRD patterns confirmed the synthesis of a singlecrystalline Ni0.5Zn0.5Fe2O4 magnetic nanocomposite. Size of the nanocomposite according to SEM wasobtained around 27 nm. Various anionic and cationic dyes were removed from water solutions using thesynthesized sorbent. The Langmuir adsorption capacities (qmax) was found to be 250.0 mg g 1 forAlizarin, 333.3 mg g 1 for reactive blue and Janus green B, 500 mg g 1 for Congo red, crystal violet andmethyl violet.