http://nopr.niscpr.res.in/handle/123456789/18291 2026-10-09T14:19:11Z http://nopr.niscpr.res.in/handle/123456789/18502 Title: Spectrophotometric determination of cadmium (II) with 5-(2ʹ-carbomethoxy-phenyl) azo-8-quinolinol in presence of sodium dodecylsulphate as surfactant Authors: Saran, R.; Baishya, N K Abstract: The reaction between cadmium (II ) and 5-(2ʹ-carbomethoxyphenyl) azo-8-quinolinol in aqueous medium at <i>p</i>H 4.0-4.8 results in an insoluble complex. Addition of sodium dodecylsulphate gives a vermillion red coloured solution which is stable for at least 8 h. Beer's law is obeyed in the range 0.04-0.88 ppm of cadmium (II) at 503 nm. The molar absorptivity and Sandell's sensiti vity at 503 nm are 1.05×10⁵ l mol^-1cm^-1 and 1.0 ng cm^-2, respectively. Alkali metals, alkaline earths, manganese (II) and chromium (VI) do not interfere. The interference of Cu(II), Pb(II), Ni(II), Fe(III), Co(II) and Mo(VI) is removed by extracting their complexes formed with the reagent at <i>p</i>H 5.5-6.5 in to methyl isobutyl ketone. However, Zn(II) and Hg(II) interfere. The method has been applied for the determination of cadmium (II) in borewell, tap and river and nallah (with suspected discharge of industrial waste) water samples. The results agree closely with the values obtained by atomic absorption spectrophotometry. Page(s): 433-436 2001-04-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/18501 Title: Pre-concentration and determination of trace elements in natural waters by inductively coupled plasma-atomic emission spectrometry Authors: Ramesh, A; Mohan, K Rama; Seshaiah, K; Rajasekhar, J Abstract: A method has been developed for the determination of Cd (II),Cu (II), Mn (II), Ni (II), Pb (II) and Zn (II) in natural waters by inductively coupled plasma-atomic emission spectrometry after pre-concentration by solvent extraction with piperidine dithiocarbamate (pipDTC). The metals are complexed with pipDTC and the complexes extracted into isobutyl methyl ketone and subsequently back-extracted into nitric acid. Metals in nitric acid have been determined by aspirating into argon plasma of ICP-AES. The method has been applied for the determination of the tested metal ions in natural waters. Page(s): 430-432 2001-04-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/18500 Title: Synthesis, spectral and electrochemical studies of ruthenium(II)/(III) complexes of alicyclic β-ketamines Authors: Prasanna, N; Srinivasan, S; Rajagopal, G; Athappan, P R Abstract: A series of ruthenium(II)/(III) complexes of alicyclic β-ketamines derived from 2-formylcyclohexanone and 4-X-substituted anilines, HFCA-X (where H is an ionisable enolichydrogen and X = H, Cl, Br, OMe and NO₂) , have been prepared and characterized by spectroscopic techniques. The IR spectral data suggest the coordination of enolic oxygen and imino nitrogen to ruthenium. Ruthenium(I I) complexes are diamagnetic (low spin <i>d</i>⁶<i>, </i>S = 0) and in solutions show intense MLCT transition. Their redox behaviours have been studied by cyclic voltammetry. The solid state low temperature ESR spectra of Ru(III) complexes show a low spin symmetry. Page(s): 426-429 2001-04-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/18499 Title: Synthesis and characterization of manganese(IV) and manganese(II) complexes with bis(2-hydroxy-1-naphthaldehydehyde)malonoyldihydrazone Authors: Lal, R A; Kumar, A; Chakraborty, J Abstract: The manganese complexes [Mn^IV(CH₂L)(H₂O)₂](1) and [Mn^II(CH₂LH₂)(A)₂] (where A = H₂O (2), pyridine (py,3), 3-picoline (3-pic, 4) and 4-picoline (4-pic, 5)) have been synthesized from bis(2-hydroxy- 1 -naphthaldehyde) malonoyldihydrazone (CH₂LH₄) and characterized by elemental analyses, molecular weight and molar conductance data, magnetic moment, electronic, IR and ESR spectral data. Page(s): 422-425 2001-04-01T00:00:00Z