title: Pyrocatecholsulphonphthalein complexan as an analytical reagent.
abstract: Pyrocatecholsulphonphthalein complexan (PSC) has been synthesized from Pyrocatechol Violet (PV), iminodiacetic acid and formaldehyde by Mannich condensation. Its acid dissociation equilibria have been studied potentiometrically. Some characteristic properties of Xylenol Orange (XO) and PV are found in PSC, which is slightly superior to XO and PV in sensitivity as a chromogenic reagent for bismuth. The spectrophotometric characteristics of some metal ion-PSC complexes are reported.
authors.affiliation: Department of Chemistry and Chemical Engineering, Hunan University, Changsha, People's Republic of China.
authors.forename: R Q
authors.initials: RQ
authors.lastname: Yu
authors.forename: Z Q
authors.initials: ZQ
authors.lastname: Zhang
authors.forename: Z H
authors.initials: ZH
authors.lastname: Zhang