NOPR Collection:

Extraction of U(VI) with the binary mixtures of high molecular mass Versatic acids

2016-07-20T06:36:08Z

Title: Extraction of U(VI) with the binary mixtures of high molecular mass Versatic acids Authors: Mohanty, S P; Mohanty, I; Sharma, P V Bhaskar; Chakravortty, V Abstract: Extraction of U (VI) with high molecular mass carboxylic acids, viz., Versatic 10 and Versatic 911 (RH)₂ in benzene as diluents has been carried out as a function of equilibrium pH. The extracted species is found to be UO₂R₂(RH)₂. A comparison of pH_0.5 values for both the extractants shows that they are of comparable extraction efficiency. Synergism was obtained with the binary mixture of the extractants. Diluent effect on the extraction has also been carried out. Page(s): 117-118

Adsorption of casein at the silica-solution interface

2016-07-20T06:35:48Z

Title: Adsorption of casein at the silica-solution interface Authors: Bajpai, A K; Dengre, R Abstract: The effects of various factors such as the concentration of casein, pH of the protein solution, presence of low molecular weight electrolytes and detergents and temperature of the adsorption medium have been studied on the adsorption of casein onto silica. Page(s): 113-116

Gas chromatographic separation and determination of ethyl chloroacetate reaction mixtures

2016-07-20T06:35:34Z

Title: Gas chromatographic separation and determination of ethyl chloroacetate reaction mixtures Authors: Husain, Sajid; Sarma, P Nageswara; Lakshmi, V V S; Rao, K Sita Rama Abstract: Ethyl chloroacetate (ECA) is a valuable chemical used in the preparation of crop protection agents and pharmaceutical intermediates. It is generally prepared by the reaction of monochloroacetic acid (MCA) and ethanol. Selective, accurate and rapid analytical methods are essential for monitoring the reaction pathway and quantitative estimation of the products during the process development of ECA. A gas chromatographic (GC) method has been developed for the separation and quantitative determination of carbontetrachloride, ethanol, water and ECA using pentyl acetate as an internal standard. The method has been successfully applied for the determination of the components of reaction mixtures of ECA. Page(s): 110-112

Effect of some anions on corrosion behaviour of 1060,1100 and 5052 aluminium alloys in orthophosphoric acid

2016-07-20T06:32:51Z

Title: Effect of some anions on corrosion behaviour of 1060,1100 and 5052 aluminium alloys in orthophosphoric acid Authors: Dubey, R S; Dubey, R Sagar; Upadhya, Y D; Upadhyay, S N Abstract: The effect of chromate, citrate, thiocyanate, tartarate, oxalate and ferrocyanide ions on the corrosion behaviour of 1060, 1100 and 5052 aluminium alloys in 1% orthophosphoric acid has been studied by weight loss technique at 30 and 40 ± 0.5^oC, whereas corrosion behaviour of 1100 aluminium alloy in the presence of above anions was studied by potentiostatic polarization technique. It was observed that these anions play a decisive role in determining the ease with which the above alloys undergo dissolution in orthophosphoric acid. Chromates, oxalates and ferrocyanides worked as corrosion inhibitors, whereas citrates, tartarates and thiocyanates accelerated the corrosion reaction at all the concentrations (0.01-0.2%) investigated. The stability of the surface film formed in the presence of these anions was closely related to the stability constant of metal-chelate complexes. Page(s): 101-109