Extraction–Spectrophotometric Determination of Pd(II) with 4-(3,5-Dichloro-2-pyridylazo)-1,3-diaminobenzene and Trichloroacetate. II
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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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Some of metal ions are the most dangerous pollutants due to their acute toxicity and carcionogenetiy. Exposure to high concentrations of these metal ions causes lung, nasal and throat cancers. Therefore, interest and demand is increasing for metal determination in biological and environmental samples [1]. Metal ions were generally determined with atomic absortion spectrophotometry or inductivel...
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 کاملSolvent extraction and separation of lanthanoids with mixtures of chelating extractant and 4-(2-pyridylazo)-resorcin
The solvent extraction of trivalent lanthanoids (La, Nd, Eu, Ho, and Lu) with mixtures of the chelating extractant 1-(2-thienyl)-4,4,4-trifluoro-1,3-butanedione (thenoyltrifluoro-acetone, HTTA) or 4-benzoyl-3-methyl-1-phenyl-2-pyrazolin-5-on (HP) and 4-(2-pyridylazo)-resorcin (PAR, S) in CHCl3 was studied. It was found that in the presence of 4-(2-pyridylazo)-resorcin the lanthanoids were extra...
متن کاملSynthesis, Characterization and Electrochemical Behaviour of 4-(4-Nitrophenyl-Azo)-2-(2-Methoxy Phenimino)-Phenol and Its Ni(II), Cu(II), Co(II) and Fe(III) Complexes
4(4-Nitrophenyl-zao)-2-(2-Methoxy phenimino)-phenol and its coordination compounds with Ni(II), Cu(II), Co(II) and Fe(III) have been synthesized and characterized by elemental analyses, FT-IR, Far-IR, Near IR, UV-Vis, mass spectrometry and molar conductivity and their electrochemical behaviours are reported.
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ژورنال
عنوان ژورنال: Bulletin of the Chemical Society of Japan
سال: 1988
ISSN: 0009-2673,1348-0634
DOI: 10.1246/bcsj.61.4121