http://nopr.niscpr.res.in/handle/123456789/19938 2026-10-08T23:18:58Z http://nopr.niscpr.res.in/handle/123456789/20006 Title: Determination of cadmium(II) with 5-Br-PADAP in the presence of CPC and HDPBA Authors: Banjare, Ravi Kumar; Deb, Manas Kanti Abstract: 2-(5-Bromo-2-pyridylazo)-5-diethylaminophenol (5- Br-PADAP), a trihydroxy phenyl dye and <i>N</i>-hydroxy-<i>N,N '</i> diphenylbenzomidine (HDPBA), a reported extractant, in presence of a cationic surfactant (CPC) have been used for the spectrophotometric determination of cadmium(II). The Cd(II)CPC-(5-Br-PADAP) red coloured complex formed in aqueous medium has been extracted with <i>N</i>-hydroxy-<i>N,N '</i> diphenylbenzomidine in dichloromethane in the <i>p</i>H range 8.6-10.6. This extracted complex shows maximum absorbance at λ_max= 560 nm against reagent blank with molar absorptivity of 9.5×10⁴ dm³ mol^-1 cm^-1. The detection limit of the method is 0.01μg ml^-1. The relative standard deviation (RSD, n= 10) for solutions containing 0.40 μg ml^-1Cd(II) is 1.6%<i>. </i>The system obeys Beer's law in the range 0.05-1.0μg ml^-l. The effect of foreign ions and other experimental variables have been studied. Cd(II) has been successfully determined in standard, environmental and biological samples using the present method. Page(s): 1408-1412 2006-06-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/20005 Title: Surface and thermodynamic properties of linear alkyl benzene sulphonate and sodium lauryl sulphate in water Authors: Kandpal, N D; Sanwal, H K Abstract: The surface parameters, maximum surface excess, ,minimum area per molecule, surface pressure for linear alkyl benzene sulphonate and sodium lauryl sulphate in water have been calculated along with thermodynamic parameters from surface tension measurements. Micelli zation is favored both by energy effects as well as by entropy gain. The increase in critical mi celle concentration with increase in temperature corresponds to the high symmetry of the system. Page(s): 1405-1407 2006-06-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/20004 Title: Studies on the crystallographic changes in an analogue of aluminosilicate mineral Muscovite on sorption of UO₂²⁺, Th⁴⁺ & Ru³⁺ Authors: Tomar, Radha; Sharma, Pankaj; Sharma, Pratibha; Tomar, Renu Abstract: An analogue of aluminosilicate mica mineral Muscovite has been synthesized hydrotherma lly at 200°C and sorption studies performed for UO₂²⁺, Th⁴⁺ and Ru³⁺ at room temperature in acidic medium (0.1 <i>M</i>)<i>. </i>The X-ray diffractograms and scanning electron micrographs have been used to verify changes in crystallinity and crystal morphology on sorption. The synthesized gel has been characterized by X-ray powder diffraction, energy dispersive spectrometry, thermogravimetric analysis, FTIR spectroscopy and scanning electron microscopy. The chemical composition of the gel is found to be K_1.4 AL_4.2 (Si₆Al₂O₂₀) (OH)₄ 2H₂O. Energy dispersive spectrometry (EDS) mapping indicates that metal ions are sorbed on the synthesized material by ion-exchange mechanism. Also, the structure of aluminosilicate mineral Muscovite is retained upon UO₂²⁺, Th⁴⁺ and Ru³⁺ sorption implying that surface and end sites are more affected upon sorption while the interlayer positions of the mineral are not engaged in metal ion sorption. Page(s): 1400-1404 2006-06-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/20003 Title: Synthesis and characterization of a new Schiff base ligand derived from benzo-15- crown-5 and its complexes with cobalt(II), nickel(II) and copper(II) Authors: Erden, Ibrahim; Demirhan, Nebahat; Avciata, Ulvi Abstract: A new Schiff base ligand, N-quino[8 ,7-b]azin-5-yl-2 ,3,5,6,8, 9,11,12-octahydrobenzo [b][ 1,4,7,10,13]pentaoxacyclopentadecin- 15-ylmethanimine (<b>1</b>) has been synthesized from the reaction of 5-amino-1, 10-phenanthroline with 4'- formylbenzo- 15-crown-5. The ligand reacts with Co(II), Ni(II) and Cu(II) salts to form complexes. The ligand and the complexes have been characterized by FTIR, ¹H NMR (DMSO-<i>d₆</i>), UV-vis, elemental analysis, mass spectra (LC-MS) and magnetic measurements. The metal to the ligand ratio of the Co(II), Ni(II) and Cu(II) complexes have been found to be 1:2. Protonation constants of the ligand and overall formation constants of the complexes have been calculated from potentiometric data using the computer program TITFIT. Page(s): 1395-1399 2006-06-01T00:00:00Z