Seasonal impacts on beta-hexachlorocyclohexane concentration in soil solution.
We analysed monthly the concentration of beta-hexachlorocyclohexane (beta-HCH), a hydrophobic organic contaminant, in aqueous saturation extracts of the topsoil from five differently contaminated sites. beta-HCH concentration in the aqueous soil extract shows a high seasonal variability. Concentrations differ up to 60-fold with peaks up to 2.24 microg l(-1). Higher beta-HCH concentrations were found in summer and autumn and accompanied by peaks in dissolved organic carbon concentration. This indicates the importance of dissolved organic matter for beta-HCH mobilization and the risks for groundwater pollution and plant uptake.
Kalbitz
K
K
University of Bayreuth, BITOEK, Department of Soil Ecology, Dr. Hans-Frisch Str. 1-3, D-95440 Bayreuth, Germany. karsten.kalbitz@biotek.uni-bayretuh.de
Popp
P
P