AI Article Synopsis
- Applying greenwaste compost on brownfield sites is common for restoring soil, but its effects on trace element movement can vary.
- A study showed that after applying compost mulch near a contaminated site, levels of organic carbon and iron in water increased, leading to higher mobilization of arsenic and antimony, which plants absorbed more readily.
- Although only a tiny fraction of trace elements was in a form easily taken up by plants, the compost's impact on different metals was uncertain, indicating that caution is needed when using it on contaminated soils.
Article Abstract
Application of greenwaste compost to brownfield land is increasingly common in soil and landscape restoration. Previous studies have demonstrated both beneficial and detrimental effects of this material on trace element mobility. A pot experiment with homogenised soil/compost investigated distribution and mobility of trace elements, two years after application of greenwaste compost mulch to shallow soils overlying a former alkali-works contaminated with Pb, Cu and As (approximately 900, 200 and 500 mg kg(-1), respectively). Compost mulch increased organic carbon and Fe in soil pore water, which in turn increased As and Sb mobilization; this enhanced uptake by lettuce and sunflower. A very small proportion of the total soil trace element pool was in readily-exchangeable form (<0.01% As, <0.001% other trace elements), but the effect of compost on behaviour of metals was variable and ambiguous. It is concluded that greenwaste compost should be applied with caution to multi-element contaminated soils.
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| http://dx.doi.org/10.1016/j.envpol.2009.12.006 | DOI Listing |
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