Indirect spectrophotometric determination of paracetamol via oxidative coupling reaction with 4-(2-pyridylazo)-resorcinoI
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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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Um método espectrofotométrico simples e sensível para a determinação de dopamina, metildopa, levodopa e catecol, puros, em formulações farmacêuticas, e em água, é descrito. O método é baseado na reação de oxidação com periodato, seguida pelo acoplamento oxidativo com ácido 4-aminobenzóico em pH 4, levando à formação de produtos coloridos. O gráfico de calibração foi linear no intervalo de 0,20-...
متن کاملSolid-phase spectrophotometric determination of trace amounts of vanadium at sub-ng/ml level with 4-(2-pyridylazo)resorcinol.
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...
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 کاملDetermination of ultra trace amount Chromium in water samples with the 1-(2-PyridylAzo)-2-Naphthol, (PAN) by the bromate ion in sulfuric acid with kinetic spectrophotometric method
A new kinetic spectrophotometic method for the determination of trace amount Chromium (III) in Teareal samples has been described based on it s the catalytic effect on the oxidations of 1 - ( 2 –PyridylAzo ) - 2 - Naphthol, (PAN), by potassium bromated in sulfuric acid. The reaction is followedspec- trophotometrically by measuring the decrease in the absorbance at 469 nm. Under the optimumcondi...
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ژورنال
عنوان ژورنال: JOURNAL OF EDUCATION AND SCIENCE
سال: 2006
ISSN: 2664-2530
DOI: 10.33899/edusj.2006.79220