NOPR Collection:

Absorbance ratio and derivative spectroscopy methods for the simultaneous estimation of lornoxicam and eperisone in their synthetic mixture.

Sun, 01 Nov 2015 00:00:00 GMT

Title: Absorbance ratio and derivative spectroscopy methods for the simultaneous estimation of lornoxicam and eperisone in their synthetic mixture. Authors: Akhtar, Jawed; Prajapati, Jatin; Elhassan, Gamal Osman Abstract: Two simple spectrophotometric methods have been developed for simultaneous estimation of lornoxicam (LXM) and eperisone (EPE) from their synthetic mixture. Method-I involves, formation of Q-absorbance equation at 265 nm (isoabsorptive point) and 290.5 nm (λ_max of Lornoxicam) and Method-II is the first order derivative spectroscopy for the simultaneous estimation of LXM and EPE. The absorbances of the standard solutions have been taken at two wavelengths 264.5 nm (ZCP of Lornoxicam) for EPE and 254 nm (ZCP of Eperisone) for LXM in 0.1N methanolic NaOH. and the linearity ranges between 2-24 µg/mL for both drugs in both methods. The accuracy and precision of the methods are determined and validated statistically. Both the methods show good reproducibility and recovery with RSD less than 2. Both methods are found to be rapid, specific, precise and accurate and can be successfully applied for the routine analysis of lornoxicam and eperisone in bulk and also their combined dosage form. Page(s): 333-337

Releasing behavior of mercury in coal during mild thermal treatment

Sun, 01 Nov 2015 00:00:00 GMT

Title: Releasing behavior of mercury in coal during mild thermal treatment Authors: Zhang, Cheng; Li, Tingting; Li, Dong; Xia, Ji; Chen, Gang Abstract: Mild coal thermal upgrading is one of the strategies for the emission control of mercury prior to coal utilization. Two Chinese coals have been selected to investigate the removal and emission behaviors of mercury in the process of coal mild thermal upgrading. Ontario Hydro Method (OHM) has been used to identify the emission behavior of different forms of mercury under rapid and temperature-programmable thermal upgrading treatments. The releasing behaviors of mercury associated with different matters in coal during thermal upgrading are identified by two-step acid washing pretreatment. The results indicate that Hg-silicate in coal is found to release between 300-450°C. Hg-sulfide is found to release between 400-600°C by mild thermal upgrading, however, oxidizing atmosphere has positive effect on lowering the releasing temperature for Hg-sulfide. Hg⁰ is the major form of mercury emitted under N₂ atmosphere by coal thermal upgrading. Temperatures increasing from 200-500°C under weak oxidizing atmosphere not only have significant effect on increasing the total mercury releasing ratio but also improving the proportion of Hg²⁺ in the flue gas, especially for coal with high Hg-sulfide compounds. Page(s): 328-332

Removal of Ni(II) ions from aqueous solution by using low cost biosorbent prepared from jackfruit (Artocarpus heterophyllus) leaf powder

Sun, 01 Nov 2015 00:00:00 GMT

Title: Removal of Ni(II) ions from aqueous solution by using low cost biosorbent prepared from jackfruit (Artocarpus heterophyllus) leaf powder Authors: Boruah, Prova; Sarma, Arunima; Bhattacharyya, Krishna G Abstract: Batch adsorption technique is utilized for the removal of Ni(II) ions in aqueous solution by jackfruit leaf powder (JLP) under different experimental conditions. Jackfruit (Artocarpus heterophyllus L., family Moraceae) leaf powder (JLP) has been prepared from clean, mature leaves of the tree, which are dried in the sun and in an air oven at 373-383 K for 3-4 h and ground to a powder. 50-100 mesh fractions are taken, washed with water and dried for 4 h at 373-383 K and preserved in a desiccator. Sorption of Ni(II) is found to be dependent on pH of the medium. The process is characterized with Freundlich, Langmuir and Temkin isotherms and the adsorption coefficients are computed in each case. Langmuir monolayer capacity for Ni(II) sorption on JLP is 11.5 mg/g that could be considered as substantial. The kinetics of adsorption have been worked out by applying first-order, second-order and intra particle diffusion models. The biosorption process is endothermic showing increase in uptake with temperature in the range of 303 to 323 K. Ni(II) is held to the surface by various functional groups present on JLP surface as seen from FTIR measurements. Page(s): 322-327

Synthesis and characterization of flame retardant jute-g-poly (2-ethyl hexylacrylate)/montmorillonite composites

Sun, 01 Nov 2015 00:00:00 GMT

Title: Synthesis and characterization of flame retardant jute-g-poly (2-ethyl hexylacrylate)/montmorillonite composites Authors: Sahu, Mamata; Sahoo, Prafulla K Abstract: Chemically modified jute fiber (Tossa variety) has been grafted onto 2-ethyl hexylacrylate (2-EHA) to prepare copolymer using in situ developed transition metal complex initiating system; CuSO₄/glycine/potassium monopersulfate (KMPS). Then its composites have been prepared by incorporating montmorillonite (MMT) clay. The samples have been characterized by Fourier Transform-Infrared (FTIR) spectroscopy and surface morphology by Scanning Electron Microscopy (SEM). The thermal behavior and tensile strength of the samples have been studied. The fire retardant properties are studied using oxygen consumption cone calorimeter. The biodegradability of the composites has been tested to see if it is ecofriendly by nature and viable for better commercialization. Page(s): 303-310