Abstract
The effect of six organic amendments on Pb solubility and availability was studied from May to September 1978 in a sandy soil low in organic matter. Three extractants were used to essay the Pb solubility: BaCl2 0.5M, AcNH4 2.5% at pH 7.0 and EDTA 0.05M at pH 7.0. During the aging process both increases and decreases of Pb solubility were observed in manured soils with respect to the control. Only in the soil treated with cow manure was a decrease of Pb solubility in ammonium acetate always noted. From regression lines of Pb concentration on soil/solution ratio it was possible to observe that only the soil treated with cow manure showed a significant decrease of slope of regression line when it was dispersed in ammonium acetate solution. The regression lines of Pb concentration on organic matter extracted by ammonium acetate and, especially, EDTA showed that these reagents extract mainly Pb complexed with organic compounds. A physiological test on Pb availability showed that only in the presence of cow manure was the Pb assimilation greatly decreased.
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Scialdone, R., Scognamiglo, D. & Ramunni, A.U. The short and medium term effects of organic Amendments on lead availability. Water Air Soil Pollut 13, 267–274 (1980). https://doi.org/10.1007/BF02145472
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DOI: https://doi.org/10.1007/BF02145472