{"title":"Spectrophotometric Determination of Aminophenol Isomers Via Oxidative Coupling Reaction with 4-Aminoantipyrine","authors":"R. Al-Luhaiby, Mohammed S. Al-Enizzi","doi":"10.33899/edusj.2020.126543.1041","DOIUrl":null,"url":null,"abstract":"A spectrophotometric method has been developed for the determination of aminophenol isomers (o-aminophenol, m-aminophenol and p-aminophenol). The method is based on oxidative coupling reaction of these compounds with 4-aminoantipyrine (4-AAP) in the presence of cupper sulphate as oxidizing agent in alkaine medium forming a reddish brown colour. The products show maximum absorption at 440 nm, 480 nm and 445 nm for o-aminophenol, m-aminophenol and p-aminophenol respectively. The molar absorptivities are 8.632×10 ,9.33×10 and 9.1449 ×10 l.mol.cm for concentrations obeyed Beer’s law in the range 1-20, 1-24 and 1-7 μg.ml for the above compounds respectively. The average recovery was ranged between 98.38% and 101.01% with relative standard deviation < 1.6 for all the studied compounds. The 4-AAP products were formed in the ratio of 1:2 aminophenol isomers : 4-AAP. The stability constant of the products was 7.4 ×10, 3.27×10 and 9.94×10 l.mol for o-aminophenol, m-aminophenol and p-aminophenol products respectively indicating the good stability of these products.","PeriodicalId":15610,"journal":{"name":"Journal of Education Science","volume":"24 1","pages":"68-84"},"PeriodicalIF":0.0000,"publicationDate":"2020-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Education Science","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.33899/edusj.2020.126543.1041","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
Abstract
A spectrophotometric method has been developed for the determination of aminophenol isomers (o-aminophenol, m-aminophenol and p-aminophenol). The method is based on oxidative coupling reaction of these compounds with 4-aminoantipyrine (4-AAP) in the presence of cupper sulphate as oxidizing agent in alkaine medium forming a reddish brown colour. The products show maximum absorption at 440 nm, 480 nm and 445 nm for o-aminophenol, m-aminophenol and p-aminophenol respectively. The molar absorptivities are 8.632×10 ,9.33×10 and 9.1449 ×10 l.mol.cm for concentrations obeyed Beer’s law in the range 1-20, 1-24 and 1-7 μg.ml for the above compounds respectively. The average recovery was ranged between 98.38% and 101.01% with relative standard deviation < 1.6 for all the studied compounds. The 4-AAP products were formed in the ratio of 1:2 aminophenol isomers : 4-AAP. The stability constant of the products was 7.4 ×10, 3.27×10 and 9.94×10 l.mol for o-aminophenol, m-aminophenol and p-aminophenol products respectively indicating the good stability of these products.