December 2012

Autocatalysed oxidation of etophylline by permanganate in aqueous sulphuric acid medium- kinetics and mechanistic study

  The reaction kinetics of oxidation of etophylline by permanganate ions has been investigated in sulphuric acid medium using spectrophotometric techniques at 25°C and at constant ionic strength, 1.60 mol dm-3, under pseudo-first order conditions. An autocatalysis reaction is observed due to the formation of one of the products, MnII. The order with respect to etophylline and MnVII concentrations are...

Author(s):   H. V. Rajeshwari, K. S. Byadagi, S. T. Nandibewoor and S. A. Chimatadar        

December 2012

Removal of ammonium and phosphates from aqueous solutions by activated and modified Bulgarian clinoptilolite

  Results from a laboratory investigation on the capability of activated and modified Bulgarian clinoptilolite samples from Beli plast deposit in Eastern Rhodopes for removing ammonium and phosphates from aqueous solutions are presented in this report. A series of ion exchange batch experiments were carried out using model water composed of NH4Cl and Na2HPO4.12H2O. Total ion exchange capacity was determined by...

Author(s):   Nadejda Taneva    

December 2012

Corrosion inhibition of mild steel in sulphuric acid solutions by using tetra methyl ammonium bromide (TMAB)

  The corrosion inhibition of mild steel in one normal sulphuric acid solution by tetra methyl ammonium bromide (TMAB) has been studied in relation to the concentration of the inhibitor as well as the temperature using electrochemical polarization (galvanostatic and potentiostatic polarizations) techniques. The results were supplemented with scanning electron microcopy and infra-red spectroscopy. All the...

Author(s):   Arwind Kumar Dubey, Gurmeet Singh and Kamlesh Tiwari