Subspeciation of sulfidic nickel in particulates. Determination of Ni3S2, NiS2, and NiS in reference and fly ash samples by carbon paste electrode voltammetry
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- 作者：J. L. Wong A1 ; Anhua Liu A1 ; M. Tian A1 ; Wenrui Jin A1
- 刊名：Fresenius' Journal of Analytical Chemistry
- 出版年：1999
- 出版时间：March 1999
- 年：1999
- 卷：363
- 期：5-6
- 页码：571-572
- 全文大小：32 KB
文摘
Abstract Nickel speciation of fly ash by sequential extraction lacks specific identification of the chemical forms in the sulfidic nickel phase. A new voltammetric analysis of Ni3S2, NiS, and NiS2 in a carbon paste electrode is reported. Characteristic peaks were observed in acetate (pH 5) as the electrolyte; the anodic peak for Ni3S2 gave a linear dose response with microgram sensitivity. 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 containing mainly soluble nickel and a high sulfur petroleum coke ash enriched with nickel.