Subspeciation of sulfidic nickel in particulates. Determination of Ni3S2, NiS2 and NiS in reference and fly ash samples by carbon paste electrode voltammetry

Citation
Jl. Wong et al., Subspeciation of sulfidic nickel in particulates. Determination of Ni3S2, NiS2 and NiS in reference and fly ash samples by carbon paste electrode voltammetry, FRESEN J AN, 363(5-6), 1999, pp. 571-572
Citations number
3
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Spectroscopy /Instrumentation/Analytical Sciences
Journal title
FRESENIUS JOURNAL OF ANALYTICAL CHEMISTRY
ISSN journal
0937-0633 → ACNP
Volume
363
Issue
5-6
Year of publication
1999
Pages
571 - 572
Database
ISI
SICI code
0937-0633(199903)363:5-6<571:SOSNIP>2.0.ZU;2-J
Abstract
Nickel speciation of fly ash by sequential extraction lacks specific identi fication of the chemical forms in the sulfidic nickel phase. A new voltamme tric analysis of Ni3S2, NiS, and NISI in a carbon paste electrode is report ed. Characteristic peaks were observed in acetate (pH 5) as the electrolyte ; the anodic peak for Ni3S2 gave a linear dose response with microgram sens itivity. Reference compounds included heazlewoodite, millerite, commercial Ni3S2, NiS2, and NiS, but the latter was shown to be: mainly the subsulfide . No Ni3S2 was found in two types of laboratory generated ash: an oil ash c ontaining mainly soluble nickel and a high sulfur petroleum coke ash enrich ed with nickel.