NOPR Collection:

Extraction chromatographic separation of molybdenum(VI) with high molecular weight liquid anion exchanger

2010-03-26T16:30:22Z

Title: Extraction chromatographic separation of molybdenum(VI) with high molecular weight liquid anion exchanger Authors: Kokate, Sudarshan J; Gavande, Amol A; Vikhe, Vittal K; Aher, Haribhau R; Kuchekar, Shashikant R Abstract: New and innovative separation method was developed for extraction of molybdenum(VI) from aqueous chloride media with N-n-octylaniline (liquid anion exchanger) coated on silica gel. Molybdenum(VI) was quantitatively extracted from 1.25 M HCl, eluted with distilled water and determined by spectrophotometric method. Different parameters viz. effect of HCl concentration, N-n-octylaniline concentration and flow rate of mobile phase were studied. The method was applied for separation of molybdenum(VI) from binary mixtures and synthetic mixtures corresponding to alloys and fertilizer samples. Page(s): 154-157

Spectrophotometric determination of frusemide by its oxidation with ceric ammonium sulphate

2010-03-26T16:30:25Z

Title: Spectrophotometric determination of frusemide by its oxidation with ceric ammonium sulphate Authors: Narayana, B; Ashwini, K Abstract: A simple and sensitive spectrophotometric method is described for the determination of frusemide (FRU). The method is based on the reaction of FRU with measured excess of ceric ammonium sulphate (CAS) followed by the determination of unreacted oxidant using xylene cyanol FF (XC) (Method A) and safranin O (SAF) (Method B). The reaction mixture exhibited maximum absorbance at 612 nm (Method A) and 526 nm (Method B). The calibration graph was linear from 20.00 to 30.00 µg mL^-1and 6.00 to 16.00 µg mL^-1for methods A and B respectively. The apparent molar absorptivity and Sandell’s sensitivity for method A and B were calculated to be 1.160×10⁴ L mol^-1cm^-1, 2.02510⁴L mol^-1 cm^-1 and 2.82×10^-3µg cm^-2, 0.0163 µg cm^-2 respectively. The method has been applied for the determination of frusemide in pure and dosage forms. Page(s): 150-153

Dissolution of copper from a primary chalcopyrite ore calcined with and without Fe₂O₃ in sulphuric acid solution

2010-03-22T16:30:25Z

Title: Dissolution of copper from a primary chalcopyrite ore calcined with and without Fe₂O₃ in sulphuric acid solution Authors: Gülfen, Mustafa; Aydın, Ali Osman Abstract: Dissolution of copper from a primary chalcopyrite ore supplied from Damar mine area in Murgul-Artvin, Turkey, has been investigated in sulphuric acid solution after the calcination with and without Fe₂O₃. The chalcopyrite with and without Fe₂O₃ were performed by thermogravimetric (TG) analysis, and the calcined chalcopyrite samples were characterized by X-ray diffraction (XRD). In the leaching experiments, the effects of calcination temperature, sulphuric acid concentration, solid/liquid ratio, agitation rate, particle size and dissolution temperature and time on copper dissolution were examined. It was found that Fe₂O₃ addition contributed to sulphation during the calcination and then copper dissolution. Page(s): 145-149

Synthesis of a biodegradable polyacrylonitrile/sodium silicate nanocomposite fire retardant

2010-03-23T16:30:30Z

Title: Synthesis of a biodegradable polyacrylonitrile/sodium silicate nanocomposite fire retardant Authors: Samal, Ramakanta; Sahoo, Prafulla K Abstract: Polyacrylonitrile (PAN)/Sodium silicate (SS) nanocomposite was synthesized via non-conventional emulsifier free emulsion method using an in situ developed transition metal complex Cu(II)/EDTA taking potassium monopersulfate (KMPS) as initiator, with a novel motive of converting hydrophobic homopolymer PAN into hydrophilic nanocomposite by the inclusion of SS to the homopolymer. The formation of the PAN/SS nanocomposite was confirmed by infrared spectra (IR). Furthermore, as evidenced by transmission electron microscopy (TEM), the composite so obtained was found to have nano scale structure. X-ray diffraction (XRD) was carried out suggesting that the silicate layers were exfoliated or intercalated during the polymerization process. An increase in the thermal stability for the developed nanocomposite was recorded by thermogravimetric analysis (TGA). The combustion behaviour has been evaluated using oxygen consumption cone calorimeter and the nanocomposite exhibited good fire retardancy. The PAN/SS nanocomposite was found to be biodegradable as tested by sludge water and further confirmed by scanning electron microscopy (SEM). Page(s): 139-144

NOPR Collection:

Extraction chromatographic separation of molybdenum(VI) with high molecular weight liquid anion exchanger

Spectrophotometric determination of frusemide by its oxidation with ceric ammonium sulphate

Dissolution of copper from a primary chalcopyrite ore calcined with and without Fe2O3 in sulphuric acid solution

Synthesis of a biodegradable polyacrylonitrile/sodium silicate nanocomposite fire retardant

Dissolution of copper from a primary chalcopyrite ore calcined with and without Fe₂O₃ in sulphuric acid solution