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Assessing the Bioavailability of Metals in Biosolids-Treated Soils

By
A. C. Chang
A. C. Chang
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D. E. Crowley
D. E. Crowley
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A. L. Page
A. L. Page
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IWA Publishing
Volume
3
ISBN electronic:
9781780404127
Publication date:
February 2004

Plant-availability of metals in biosolids-treated soils may be mathematically described by Mt = C × [1 − e- (k × t)] where Mt (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, and k 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 of growing 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-treated soils for determinging C and k. In this manner, the plant available metals of the bioslids-treated soils are defined by the total avialble metals, half-life, and duration of plant growing. Examples showed that the total available metals of the biosolids-amended were 18 to 39, 0.12 to 2.0, 7.4 to 13, 24 to 46, 1.2 to 2.1, and 43 to 53% of the total Cd, Cr, Cu, Ni. Pb, and Zn in the soils.

ISBN: 9781780404127 (eBook)

Assessing the Bioavailability of Metals in Biosolids-Treated Soils
By: A. C. Chang, D. E. Crowley, A. L. Page
DOI: https://doi.org/10.2166/9781780404127
ISBN (electronic): 9781780404127
Publisher: IWA Publishing
Published: 2004

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