http://nopr.niscair.res.in/handle/123456789/8562 Search the Channel search http://nopr.niscair.res.in/simple-search http://nopr.niscair.res.in/handle/123456789/8699 Title: Kinetic theory --- From Euler to Maxwell <br/> <br/>Authors: Wisniak, Jaime <br/> <br/>Abstract: Acceptance of the kinetic theory of gases was the entrance to the development of the concepts that presently explain the structure of matter. The basic ideas of the Greek philosophers remained dormant for several centuries until Euler, Bernoulli, Herapath, Waterston, Clausius, and Maxwell, injected a sounder physical picture that led to our actual understanding of the structure of a gas. <br/> <br/>Page(s): 730-742 http://nopr.niscair.res.in/handle/123456789/8698 Title: Indirect complexometric determination of mercury(II) using 1-propane thiol (PT) as a selective masking agent <br/> <br/>Authors: Parameshwara, P; Karthikeyan, J; Shetty, A Nityananda; Shetty, Prakash <br/> <br/>Abstract: A complexometric method for the determination of mercury(II) in presence of other metal ions is described based on the selective masking action of 1-propane thiol towards mercury(II). Mercury(II) present in a given sample solution is first complexed with an excess of EDTA and the unreacted EDTA is titrated against lead nitrate solution at pH 5-6 (hexamine buffer) using xylenol orange as the indicator. A 0.8% aqueous solution of 1-propane thiol is then added to displace EDTA from the Hg(II)-EDTA complex. The released EDTA is titrated with standard lead nitrate solution as before. Reproducible and accurate results are obtained for 4-85 mg of mercury(II), with relative error less than ±0.23 % and coefficient of variation not more than ±0.41 %. The effects of various ions were studied. The method is used for the analysis of mercury(II) in its synthetic alloy mixtures and also in complexes. <br/> <br/>Page(s): 727-729 http://nopr.niscair.res.in/handle/123456789/8697 Title: Role of instrumental techniques in studies on wet oxidation of coal: A review <br/> <br/>Authors: Sen, Raja; Srivastava, Sunil K; Singh, Madan M <br/> <br/>Abstract: Coal being a complex macromolecular solid is insoluble in most organic solvents. For structural studies, coal has to be subjected to chemical degradation to generate smaller fragments, which are more amenable for characterisation. For this, oxidative degradation is commonly used. A large number of wet oxidising agents have been used by researchers. All these oxidising agents have shown different reactivities and mode of attack with respect to coal. However, for structural analysis to be successful the fragments generated by oxidation must be well characterised to generate the maximum information. This review discusses the use of various instrumental techniques used to characterise the oxidation products. <br/> <br/>Page(s): 719-726 http://nopr.niscair.res.in/handle/123456789/8696 Title: Studies on extraction of chromium(VI) from acidic solution by emulsion liquid membrane <br/> <br/>Authors: Chakraborty, Sekhar; Datta, Siddhartha; Bhattacharya, Pinaki <br/> <br/>Abstract: High molecular weight amines, quaternary salts etc. have the potential of removing heavy metal ions including the toxic ones at low concentrations. In the present work an attempt has been made to extract Cr(VI) through emulsion liquid surfactant membrane (or, emulsion liquid membrane-ELM) from it’s acidic solution using alamine-336 and caustic soda as extractant and striping reagents respectively. Around 97% extraction of Cr(VI) from aqueous solutions of potassium dichromate through batch experimentations have been achieved. Being crucial to the overall success of the ELM processes, experiments on emulsion stability have also been performed to arrive at a reasonably stable emulsion composition. Effect of various process parameters such as initial solute concentration, concentration of internal phase etc. as also that of pH on extraction of chromium have been investigated<i style="">.</i> <br/> <br/>Page(s): 713-718