The amendment of degraded urban soils using recycled organic wastes offers potential improvements to physicochemical status and functionality, but there is a paucity of knowledge on the potential impact on residual contaminants in soil. The aim of this study was to evaluate the mobility of trace metals and arsenic (As) through an urban soil following amendment with green waste compost over an annual cycle. Rhizon soil pore water samplers were inserted into the sides of a soil pit located in a relatively undisturbed urban lawn, which was amended with a surface mulch of green waste compost. Regular sampling and analysis of pore water from the compost and at varying soil depths was carried out, in comparison to an adjacent profile, which had not been amended.
Conclusions, recommendations and perspectives Amendment of urban soils with green waste compost mulches impacts on residual trace element contaminants and may enhance mobilisation of harmful elements to the wider environment, meaning that caution is needed when applying compost to soils with elevated levels of trace metals.
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