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

Titelangaben

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. Bd. 204 (1997) Heft 1 . - S. 37-48.
ISSN 0048-9697
DOI: https://doi.org/10.1016/S0048-9697(97)00164-2

Abstract

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.

Weitere Angaben

Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Zusätzliche Informationen: BAYCEER9145
Institutionen der Universität: Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften > Lehrstuhl Bodenökologie
Forschungseinrichtungen > Forschungszentren > Bayreuther Zentrum für Ökologie und Umweltforschung - BayCEER
Fakultäten
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften
Forschungseinrichtungen
Forschungseinrichtungen > Forschungszentren
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 500 Naturwissenschaften und Mathematik
Eingestellt am: 22 Okt 2015 07:29
Letzte Änderung: 10 Mär 2016 08:34
URI: https://eref.uni-bayreuth.de/id/eprint/20733