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EN
In the present study, two potential industrial waste materials, such as, fly ash (FA) and lime sludge (LS) that are generated in bulk quantities and poses environmental hazards were mixed and stabilized using lime (CL) and gypsum (G) in order to make them suitable for use in Civil Engineering construction applications. Different mix proportion of FA and LS stabilized with different % of CL and G were studied and tested for unconfined compressive strength (UCS), split tensile strength test (STS) and California bearing ratio (CBR) to check the suitability of prepared composite for construction industries. It is noted that the optimal composition consisted of FA and LS in 1:1 ratio, 12% CL and 1% G content. The composite was also found to be durable with no leaching of heavy metals. Further, the selected composite was further studied for the microstructural development through scanning electron microscopy (SEM) and X-ray diffraction (XRD) to understand the phenomenon of chemical process or reaction and reason for strength gain. The developed composite (50FA + 50LS + 12CL + 1G) is suggested for application as base course layer material in flexible pavements due to its good requisite strength and durability. It is further highlighted that issues of uncertainty in strength and stiffness characteristics of pavement layer materials and its implications on analysis and design of flexible pavements can be studied through reliability based approach in combination with numerical analysis and Monte Carlo simulations.
EN
The electrochromatographic behaviour of amino acids has been studied on cerium(IV) tungstate-impregnated papers. Five background electrolytes of different pH were investigated at a fixed potential and for a fixed time. On the basis of the compounds' differential migration, which depends on the ion-exchange properties of the cerium(IV) tungstate and the nature of the complexes formed with the electrolytes, some useful binary and ternary separations of amino acids have been achieved. The separation of some acidic amino acids from the others present, that of DL-ß-phenyl-alanine from other phenyl (and other) amino acids, and the separation of DL-isoleucine from DL-norleucine are of special interest. L-Lysine and DL-methionine from seven pharmaceutical products have been separated and quantitatively analysed. The utility of this simple, inexpensive, and accurate method has been illustrated by the analysis of amino acids in pharma-ceutical products.
3
Content available remote Retention behaviour of synthetic dyes on zirconium(IV) phosphoantimonate papers
EN
The chromatographic behaviour of 24 synthetic dyes has been studied on zirconium(IV) phosphoantimonate papers with ten pure and mixed mobile phases including tap water and five buffers of different pH. The effects of mobile phase composition, impregnation, and pH on RF values were studied. The movement of dyes is explained on the basis of ion exchange, adsorption, intermolecular hydrogen-bonding, and the solubility of the dyes in the mobile phases. Differences between RF values have enabled many analytically difficult binary and ternary separations.
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