| Autor: |
Lusilao-Makiese, Julien1, Tessier, Emmanuel2, Amouroux, David2, Tutu, Hlanganani1, Chimuka, Luke1, Cukrowska, Ewa M.1 ewa.cukrowska@wits.ac.za |
| Předmět: |
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| Zdroj: |
Toxicological & Environmental Chemistry. Oct2012, Vol. 94 Issue 9, p1688-1706. 19p. |
| Abstrakt: |
Total mercury (HgTOT) concentrations were determined by inductively coupled plasma mass spectrometry (ICP MS) for South African Highveld coals. The distribution of Hg in coals was investigated using a four-stage sequential leaching protocol and isotope dilution/gas chromatography coupled to ICP MS (ID-GC-ICP MS). The results show that HgTOT ranged from 144 to 303 µg kg−1 with a mean of 199 ± 26 µg kg−1, while HgTOT leached from coals using different solvents ranged between 103 and 310 µg kg−1 (mean: 218 ± 60 µg kg−1). Hg leaching rates of 53–78% were achieved in crushed coals. Hg0, Hg2+, and CH3Hg+ were identified in all coals. CH3Hg+ in studied coals ranged between 0.1 and 0.4 (mean: 0.2) µg kg−1. GC ICP MS chromatograms also showed unknown Hg peaks which were identified as other organomercury species such as ethylmercury. Modes of occurrence of Hg in coals were variable with the organic-bound (37–40%) and the sulfide-bound (37–39%) being the dominant mercury forms. Increasing the HCl concentration in the used protocol increased the amount of Hg leached (16%) during this step. [ABSTRACT FROM AUTHOR] |
| Databáze: |
GreenFILE |
| Externí odkaz: |
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