Assessing Bioavailability of Metals in Biosolids-Treated Soils

Plant-availability of metals in biosolids-treated soils may be mathematically described by Mt= C x [1- e- (k x t)] whereMt(mg kg-1) is the cumulative metal removal from the biosolids-treated soils by growing and harvesting plants for t years, C is the total phytoavailable metal pool of the soil (mg kg-1) at t = 0,andk is the metal absorption rate coefficient(yr-1). The total available metal pool, C, is defined as metals extractable by organic acids in the rhizosphere ofgrowing plants and k is related to the kinetics of metal release by organic acids. Half-life of the available metals in biosolids-amended soils may be derived from k.Experiments were conducted to characterize the concentration and composition of the organic acids. A successive extraction method was used to extract metals from biosolids-treatedsoils for determinging C and k. In this manner, the plantavailable metals of the biosolids-treated soils are defined by the total available metals, half-life, and duration of plant growing.