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The effect of ageing, following the addition of ∼400mgkg −1 lead (Pb) as Pb(NO 3 ) 2 , on Pb bioaccessibility was examined in five typical Chinese soils using a physiologically based extraction test. Sequential extraction was employed to identify the source fraction(s) of bioaccessible Pb in the soils. Pb bioaccessibility decreased exponentially to nearly steady levels in mildly...
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