title: Extractive photometric determination of gold(III) with 1-(2',4',6'-trichlorophenyl)-4,4,6-trimethyl-(1H,4H)-2-pyrimidinethiol in presence of tri-iso-octylamine.
abstract: Tervalent gold was determined spectrophotometrically as its anionic 1:4 gold-thiol complex extracted into chloroform from aqueous acidic medium (1.5M sulphuric acid) in the presence of tri-iso-octylamine. The complex exhibits maximum absorption at 480 nm (molar absorptivity 4.60 x 10(3) l.mole(-1).cm(-1)) and Beer's law is obeyed in the concentration range 5-50 microg of gold(III) per ml. The relative standard deviation and relative error, calculated from ten determinations of solutions containing 15 microg of gold(III) per ml were 1.0% and 0.8%. The method is simple, selective and reproducible. It permits separation of gold(III) from associated elements and its determination in synthetic mixtures.
authors.affiliation: Analytical Chemistry Laboratory, Shivaji University, Kolhapur 416004, India.
authors.forename: M A
authors.initials: MA
authors.lastname: Amuse
authors.forename: S R
authors.initials: SR
authors.lastname: Kuchekar
authors.forename: N A
authors.initials: NA
authors.lastname: Mote
authors.forename: M B
authors.initials: MB
authors.lastname: Chavan