Issue 12, 2005

Investigation on chemical species of arsenic, selenium and antimony in fly ash from coal fuel thermal power stations

Abstract

Investigations of the existing chemical forms and the concentrations of arsenic (As), selenium (Se) and antimony (Sb) in samples of fly ash obtained from six coal-fired power stations in various countries were carried out. The concentration of As was found to vary from 5.4 to 22.3 mg kg−1, and the most common mode of occurrence of As in the fly ashes is in association with carbonates or Fe–Mn oxides. The concentrations of Se and Sb ranged from 2.3–5.2 and 1.0–3.9 mg kg−1, respectively. The dominant chemical forms of Se and Sb in the fly ashes were as extractable species. Also, water-soluble As, Se and Sb in the fly ashes were extracted, and the chemical species of As, Se and Sb in the extract determined using HPLC-ICP-MS. This was done as the potential release of soluble As, Se and Sb through leaching of fly ash is of environmental concern. The most abundant form of As in the extract was the low toxicity As(V). The main species of Se was Se(IV), although it was found that the ratio of Se(VI) to Se(IV) in acidic fly ashes is higher than in alkaline fly ash samples. Antimony was mostly present as Sb(III).

Graphical abstract: Investigation on chemical species of arsenic, selenium and antimony in fly ash from coal fuel thermal power stations

Article information

Article type
Paper
Submitted
11 Jul 2005
Accepted
10 Oct 2005
First published
24 Oct 2005

J. Environ. Monit., 2005,7, 1342-1348

Investigation on chemical species of arsenic, selenium and antimony in fly ash from coal fuel thermal power stations

T. Narukawa, A. Takatsu, K. Chiba, K. W. Riley and D. H. French, J. Environ. Monit., 2005, 7, 1342 DOI: 10.1039/B509817C

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