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Firouzabad, Iran

Kiani M.,Payame Noor University | Alavianmehr M.M.,Shiraz University of Technology | Otoofat M.,Firouzabad Azad University | Mohsenipour A.A.,University of Waterloo | Ghatee A.,Firouzabad Azad University
Russian Journal of Physical Chemistry A

In this work, we identify a simple method for predicting transport properties of fluids over wide ranges of temperatures and pressure. In this respect, the capability of several equations of state (EOS) and second virial coefficient correlations to predict transport properties of fluids including carbon dioxide, methane and argon using modified Enskog theory (MET) is investigated. The transport properties in question are viscosity and thermal conductivity. The results indicate that the SRK EOS employed in the modified Enskog theory outperforms other equations of state. The average absolute deviation was found to be 12.2 and 18.5% for, respectively, the calculated thermal conductivity and viscosity using the MET. © 2015 Pleiades Publishing, Ltd. Source

Ghaedi M.,Yasouj University | Shabani R.,Firouzabad Azad University | Montazerozohori M.,Yasouj University | Shokrollahi A.,Yasouj University | And 3 more authors.
Environmental Monitoring and Assessment

A sensitive and simple method based on modification of Sepabeads SP70 by 4-((E)-3-phenylallylidene) amino) benzenethiol for the simultaneous preconcentration of trace amounts of copper (Cu), nickel (Ni), chromium (Cr), and zinc (Zn) ions in some real samples has been reported. The metal ions which are retained as respective complexes on solid phase were eluted with 8 ml of 4 M nitric acid. The influences of different analytical parameters including pH, ligand amount and Sepabeads SP70 and SDS amount, eluting solutions, and sample volume on metal ions recoveries were investigated. The effects of matrix ions on the retentions of the analytes were also examined. The recoveries of analytes were generally >95% with RSD between 0.74 and 0.88. The proposed method has been successfully applied for the determination of these metals in some real samples with complex matrices. © 2010 Springer Science+Business Media B.V. Source

Ghaedi M.,Yasouj University | Montazerozohori M.,Yasouj University | Tabatabie M.,Firouzabad Azad University | Noormohamadi H.,Firouzabad Azad University | Haghighi A.B.,Firouzabad Azad University
Journal of AOAC International

The efficiency of modified activated carbon (AC) and multiwalled carbon nanotubes (MWCNTs) for the separation/ preconcentration and determination of Co, Cd, Pb, Zn, and Cu following their complexation by bis(3-nitrobenzylidene)-1,2- ethanediamine has been described and compared. A one-at-a-time optimization method investigated the influence of various parameters that significantly influence the recoveries of the studied metal ions. At the optimum values of all variables, the response was linear over the range of 0.01-0.3 μg/mL, and detection limit (3 SDb/m, n = 10) was between 1.41-2.05 ng/mL for both sorbents while the preconcentration factor was 100 for AC and 500 for MWCNTs. The method was successfully applied for preconcentration and determination of trace amount of the aforementioned ions in various real samples such as orange, lettuce, bread, and pear. Source

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