title: Colorimetric detennination of pyrogallol and 2,6-dimethoxyphenol with diphenylpicrylhydrazyl.
abstract: A colorimetric study was made of the reactions of the free radical 2,2-diphenyl-1-picrylhydrazyl (DPPH) and the phenols pyrogallol and 2,6-dimethoxyphenol. Both of these phenols were colorimetrically determined by use of DPPH, in the presence of various interferents. It was shown that the determination of pyrogallol and 2,6-dimethoxyphenol was more accurate when absolute ethanol was used than with 95 % ethanol. It was also shown that the best results were obtained when the ratio of phenol to interferent was no greater than 1:1.
authors.affiliation: Department of Chemistry, Wayne State University, Detroit, Michigan 48202, U.S.A.
authors.forename: G H
authors.initials: GH
authors.lastname: Schenk
authors.forename: N K
authors.initials: NK
authors.lastname: Swieczkowski