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- Title
pH-dependent extraction of soil and soil amendments to understand the factors controlling element mobility.
- Authors
CARTER, C. M.; VANDER SLOOT, H. A.; COOLING, D.
- Abstract
A combination of the pH-dependent leaching test CEN/TS 14429 and geochemical modelling (LeachXS©-ORCHESTRA) was used to evaluate the partitioning of major, minor and trace elements in relation to their phosphorus retention capability, the release of non-nutrient constituents, their reduction of soil acidity and their organic matter retention. One Australian soil sample and two different soil amendments (Red Lime and Alkaloam) were studied. The pH-dependent leaching test showed that the acid neutralization capacity and the phosphorus retention of the soil were improved, respectively, by a factor of two to five and by a factor of two to ten after addition of these amendments. The amendments improved retention of dissolved organic matter (by a factor of 3–10) and did not increase leachability of undesired contaminants. The partitioning as obtained from modelling between free and dissolved organic-carbon-bound metals provides insight into the potential for uptake (bioavailability). This partitioning is very pH-dependent and therefore testing and associated chemical speciation modelling provide valuable information for judging traditional soil improvers and soil amendments, including the waste-derived soil amendments Alkaloam and Red Lime.
- Subjects
SOIL amendments; HYDROGEN-ion concentration; SOIL leaching; GEOCHEMICAL modeling; SOIL acidity
- Publication
European Journal of Soil Science, 2009, Vol 60, Issue 4, p622
- ISSN
1351-0754
- Publication type
Article
- DOI
10.1111/j.1365-2389.2009.01139.x