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β-HCH mobilization in polluted wetland soils as influenced by dissolved organic matter

Title data

Kalbitz, Karsten ; Popp, Peter ; Geyer, Wolfgang ; Hanschmann, Günter:
β-HCH mobilization in polluted wetland soils as influenced by dissolved organic matter.
In: Science of the Total Environment. Vol. 204 (1997) Issue 1 . - pp. 37-48.
ISSN 0048-9697
DOI: https://doi.org/10.1016/S0048-9697(97)00164-2

Abstract in another language

The beta isomer of 1,2,3,4,5,6-hexachlorocyclohexane (beta-HCH) which is formed during synthesis of the pesticide lindane shows high mobility in polluted soilsdespite its low water solubility. Therefore, we studied the correlation between the quantity and quality of dissolved organic matter (DOM) and the mobilization andtransport of beta-HCH in two soil profiles used as grassland and in incubation experiments. From our results we conclude that beta-HCH was mobilized andtransported to deeper soil horizons probably by coupling between beta-HCH and DOM. The interaction of beta-HCH with DOM as indicated by the measuredhigh partition coefficient between beta-HCH and DOM (logK(DOC) = 4.39) was much higher than would be expected from the physicochemical properties of beta4-HCH. As suggested from synchronous fluorescence spectroscopy data, the capacity of DOM to bind beta-HCH increases as the more extended aromatic regionsof DOM are accessible in the aqueous extracts. The addition of lime and fresh organic matter to the grassland soils did not affect the measured coupling betweenbeta-HCH and DOM. Long drying periods increased the coupling up to 9.9 mu g beta-HCH per mg DOC. Water-logging destroyed the binding between DOMand beta-HCH despite increasing DOC contents. Our main conclusion is that qualitative differences in DOM due to changed environmental conditions can drasticallychange the coupling of hydrophobic organic pollutants to DOM and greatly affect pollutant mobilization and translocation.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER9145
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Chair Soil Ecology
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences
Research Institutions
Research Institutions > Research Centres
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 22 Oct 2015 07:29
Last Modified: 10 Mar 2016 08:34
URI: https://eref.uni-bayreuth.de/id/eprint/20733