Abstract
Background, aim, and scope
Natural porous material structure is a key parameter in the transport of particles and associated contaminants towards groundwater, and it is a dynamic property that evolves with water content. This study investigates the relationship between aggregation–potential leaching and moisture content.
Materials and methods
To conduct this study, a contaminated urban Technosol originating from stormwater infiltration practice was used: 10–14% organic matter, total organic carbon (TOC): 4–5.6 mg/g, Zn: 1.9–1.25 g/kg, Cd: 9.7–15.0 mg/kg. Five field samplings and a laboratory drying experiment were performed to obtain samples with contrasted moisture contents. Laser diffractometry was used to measure aggregation state and potential leaching was assayed by a low-energy input leaching test and the measurement of heavy metals (Zn, Cu, Ni, Pb, and Cr) and TOC.
Results
The way in which Technosol material forms aggregates while drying is described: microaggregates lead to larger microaggregates, then their association leads to macroaggregates that become increasingly stable. The leaching of particles and contaminants was shown to slow down consecutive to drying (from 53 to 3.3 × 10−5 g of particles leached/mL of leaching solution).
Discussion
Regarding heavy metal mobility, the low-energy input leaching test did not provide the same conclusions as more disturbing methods of risk assessment. The mechanisms of aggregation of Technosol materials consecutive to drying are discussed in comparison to already published works on soil aggregates.
Conclusions
We conclude that moisture content is a key parameter regarding the aggregation of Technosol materials and leaching of particles and associated contaminants. What is more, the recent history of the surface layer of the Technosol must be taken into account.
Recommendations and perspectives
Soil and sediment structure must be taken into account to assess contaminant transfer. Stormwater can be slowed down when it arrives in infiltration basins, in order to limit particle disaggregation and leaching. Further research is needed to understand the different aspects involved in heavy metal partitioning.
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Badin, AL., Bedell, JP. & Delolme, C. Effect of water content on aggregation and contaminant leaching: the study of an urban Technosol. J Soils Sediments 9, 653–663 (2009). https://doi.org/10.1007/s11368-009-0128-3
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DOI: https://doi.org/10.1007/s11368-009-0128-3