Research
Application Of Icp-Oes In The Comparative Analysis Of A Used And Fresh Gasoline Motor Oil
In a fresh and 14500 km used oil, viscosity, viscosity index, flash point, pour point, specific gravity, color, total acid number, total base number, water content, as well as concentrations of twenty four elements, were determined. The mineral baesd, gasoline motor oil Speedy SL, from Sepahan Oil Company was chosen for study. The physical properties were characterized by ASTM protocols. The elemental analysis was performed by inductively coupled plasma- optical emission spectroscopy (ICP-OES) . The results indicate that after the application of fresh oil, both of the physical properties and elemental concentrations have been changed significantly. Possible reasons for the observed variations have been discussed.
Interaction Between Cryptand 222 And Tetracyanoethylene In Di And Trichlorom Ethane Solutions
A spectrophotometric study concerning the interaction between cryptand 222 as n-donor and TCNE as π- acceptor has been performed in di and tri chloromethane solutions at temperatures 5, 10, 15, and 20°c. The results of continuous variation and mole ratio methods indicate the formation of 1:1 complexes in both solvents and at all temperatures. The stability constants and the molar absorption coefficients at different temperatures have been calculated from the computer fitting of absorbance- mole ratio data in MATLAB soft ware. The results indicate that Kf values in CHCl3 are more than the corresponding amounts in CH2Cl2. In the case of Є, the reverse trend is observed. The H° and S° values were obtained by Vant Hoff method. The obtained data show that the enthalpy of complex formation in two solvents is favorable. While entropy is favorable in the case of CHCl3 and unfavorable in the case, of CH2Cl2. The possible reasons for such observation are discussed. The kinetic results confirm an overall second order reaction which is first order with regard to each reactant. The formation of free ions is rejected by the conductometric measurments
