The extraction-spectrophotometric determination of chromium(III) with 4-(2-pyridylazo)-resorcinol
β Scribed by Takao Yotsuyanagi; Yasuo Takeda; Ryuji Yamashita; Kazuo Aomura
- Publisher
- Elsevier Science
- Year
- 1973
- Tongue
- English
- Weight
- 754 KB
- Volume
- 67
- Category
- Article
- ISSN
- 0003-2670
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The extraction of 4-(2-pyridylazohesorcinol (PAR) and 4-(2-thiazolylazo)resorcinol (TAR) with chloroform alone and in the presence of tetraphenylarsonium or tetraphenylphosphonium chloride (Ph,XCl) was studied. In the optimum pH range 3.5-5 for PAR and 1.5-5 for TAR, 94-95% of the reagents was extra
The acidity constants of 4-(2-pyridylazo)resorcinol (PAR, Scheme 1) in binary mixtures of methanol-water at 25 β’ 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 increase