The effect of preferential flow on the heavy-metal mobility
We used large size (18m<2> surface area;1m depth) lysimeters to investigate lead (Pb) leaching from contaminated (480mg/kg Pb) soil in field-like conditions for a five-month period. Despite the high soil pH (7.2), we measured up to 0.02mg/kg of Pb in the leachate. By comparing total concentrations and concentration measured after we filtered the sampled solution, we showed that Pb was primarily leaching on suspended material. We estimated the partition coefficient (k<,d>) for Pb to be k<,d>=150cm<3>/g by using a modelling approach, taking into account realistic dynamic conditions. The comparatively small k<,d> value was the consequence of the facilitated transport of Pb due to the combined effects of preferential flow and particulate leaching. These results highlighted the risks associated with preferential flow in the management of Pb- contaminated soils.
Root macropore particulate leaching lead
Stephanie Roulier Brett Robinson Emanuel Kuster Rainer Schulin
Institute of Terrestrial Ecosystems, ETHZ, Universitatstrasse 16, 8092 Zurich. witzerland Institute of Terrestrial Ecosystems, ETHZ, Universitatstrasse 16, 8092 urich. Switzerland Institute of Terrestrial Ecosystems, ETHZ, Universitatstrasse 16, 092 Zurich. Switzerland Institute of Terrestrial Ecosystems, ETHZ,Universitatstrasse 16, 8092 Zurich. Switzerland
国际会议
第九届痕量元素生物地球化学国际会议(9th International Conference on the Biogeochemistry of Trace Elements)
北京
英文
659-660
2007-07-15（万方平台首次上网日期，不代表论文的发表时间）