Photometric determination of mercury(II) 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...
متن کاملMultiwavelength spectrophotometric determination of protolytic constants of 4-(2-pyridylazo) resorcinol (PAR) in binary DMF-water mixtures.
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 کاملIon-association complexes of gallium(III)-4-(2-pyridylazo)-resorcinol anionic chelates and dicationic tetrazolium reagents.
The formation and liquid-liquid extraction of ion-association complexes between gallium(III)-4-(2-pyridylazo)resorcinol (PAR) anionic chelates and cations of four ditetrazolium chlorides (DT2+) were studied: Neotetrazolium chloride (NTC), Blue Tetrazolium chloride (BTC), Nitro Blue Tetrazolium chloride (NBT) and Tetranitro Blue Tetrazolium chloride (TNBT). The optimum extraction-spectrophotomet...
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ژورنال
عنوان ژورنال: Fresenius' Zeitschrift f�r Analytische Chemie
سال: 1972
ISSN: 0016-1152,1618-2650
DOI: 10.1007/bf00430288