Spectrophotometric determination of titanium with 4-(2-pyridylazo) resorcinol
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Spectrophotometric determination of acidity constants of 4-(2-pyridylazo)resorcinol in binary methanol–water mixtures
The acidity constants of 4-(2-pyridylazo)resorcinol (PAR, Scheme 1) in binary mixtures of methanol–water at 25 ◦C and an ionic strength of 0.1 M have been determined spectrophotometrically. DATa ANalysis (DATAN) program applied for determination of acidity constants. As percent of methanol increases in solvent mixtures the pKa constants also increased. There is linear relationship between acidi...
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Solid-phase spectrophotometry has been applied to analysis for trace amounts of vanadium. Vanadium was sorbed in a styrene-divinylbenzene-type anion-exchanger Dowex 1-X8 as a vanadium-4-(2-pyridylazo)resorcinol complex. Resin phase absorbances at 562 and 800 nm were measured directly which allowed the determination of vanadium in the range of 0.1-2.4 ng/ml with a RSD of 1.5%. The method has bee...
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A mixture of Ti(IV) and 4-(2-pyridylazo) resorcinol was found to be useful in the spectrophotometric determination of trace amounts of hydrogen peroxide. The absorbance of the complex formed at 508 nm was proportional to the concentration ofhydrogen peroxide added. The reagent was applied to the assay ofglucose through coupling with glucose oxidase which produces HP2' This method of glucose det...
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A multiwavelength spectrophotometric titration method was applied to study the protolytic constants of 4-(2-pyridylazo) resorcinol(PAR), in binary DMF+water mixtures. UV-vis absorption spectra of PAR solution were recorded in the course of pH-metric titration of acidic solutions of PAR with standard base solution. The protolytic equilibrium constants, spectral profiles, concentration diagrams a...
متن کاملSPECTROPHOTOMETRIC- STUDY OF THERMODYNAMICS OF SOME HEAVY METAL COMPLEXES OF 4-(2 - PYRIDYLAZO) RESORCINOL IN BINARY ACETONITRILEDIMETHYLFORMAMIDE MIXTURES
The complexation reactions between 4-(2-pyridy1azo)-resorcinol and Cd ,H g and Pb io ns have been investigated in acetonitrile-dimethyEomamide mixtures at various temperatures using a spectrophotometric technique. The stoichiometry and the formation constants of the complexes formed in solution were calculated by computer refinement of absorbance-mole ratio data using nonlinear least-square ...
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ژورنال
عنوان ژورنال: BUNSEKI KAGAKU
سال: 1967
ISSN: 0525-1931
DOI: 10.2116/bunsekikagaku.16.435