title: [Ultra trace determination of platinum, palladium, gold and rhodium in minerals].
abstract: Our work studied the minerals dissolved in aqua regia. The trace Pt(II), Pd(II) Au (III) and Rh(I) complexes were loaded by the mixed carbon powder which carried diphenyl thiourea when aqua regia or hydrochloric acid media as well as stannous chloride were present. We added some carbon powder in ashen loader and determined the elements with atomic emission spectrometry. The determination sensitivity counted with 10 grams of samples is 1 x 10(-9). The RSD for 0.05 x 10(-6) standard Pt, Pd, Au and Rh solutions are 6.0%, 5.1%, 8.5% and 11.4%, respectively. The method is simple and operation is easy. The results satisfy our requirement.
authors.affiliation: Experiment Center of Yunnan University, 650091 Kunming.
authors.forename: H
authors.initials: H
authors.lastname: Xu
authors.forename: J
authors.initials: J
authors.lastname: Wang
authors.forename: G
authors.initials: G
authors.lastname: Wang
authors.forename: M
authors.initials: M
authors.lastname: Liu
authors.forename: B
authors.initials: B
authors.lastname: Lu
authors.forename: Z
authors.initials: Z
authors.lastname: Lü
authors.forename: W
authors.initials: W
authors.lastname: Feng
authors.forename: X
authors.initials: X
authors.lastname: Chen