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.