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| Titel |
Extraction of arsenic in a soil of the blackfoot disease endemic area with ionic liquids |
| VerfasserIn |
C.-Y. Liao, H. Paul Wang, C.-Y. Peng, H.-Y. Kang, Y.-L. Wei |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250022430
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| Zusammenfassung |
| Speciation of arsenic in the soil of the old blackfoot disease endemic area in the Southern
Taiwan has been studied by X-ray absorption near edge structural (XANES) and
extended X-ray absorption fine structural (EXAFS) spectroscopy. Experimentally, at
the contact time of 30-180 min, 30-40% of As(III) and 40-60% of As(V) in the
soil can be extracted with a room temperature ionic liquid (RTIL) [BMI][BF4]
(1-butyl-3-methylimidazolium tetrafluoroborate). For the relatively hydrophobic RTIL
[BMI][PF6] (1-butyl-3-methylimidazolium hexafluorophosphate), on the contrary, 10-15% of
As(III) and 20-25% of As(V) can be extracted. By XANES, it is found that an enhanced
oxidation of the extracted As(III) (As(III)→As(V)) in the RTIL may occur during the
extraction processes. The refined EXAFS spectra also indicate that the bond distances of
As(III)-N and As(V)-N in the arsenic-extracted RTILs are 1.76-1.78 and 1.68-1.70 |
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