We investigated the influence of monoammonium phosphate (MAP) and diammonium phosphate (DAP) on the adsorption process of Cd by two typic soils. The phosphate induced variations in the pH values of soil-Cd suspensions, drastically influenced the solubility of the heavy metal in the two soils. MAP decreased the amount adsorbed while DAP increased the quantity fixed by the soil. The effect was particularly remarkable in the soil with low content of organic matter (Lamporecchio soil) where the addition of DAP caused the precipitation of the heavy metal. In the organic soil (Orentano soil) the effect of phosphate was less evident because of the high buffering capacity of this soil, rich in colloidal fractions.
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Institute of Agricultural Chemistry, University of Pisa, Via S. Michele, 2, 56100, Pisa, Italy
Renato Levi-Minzi
Institute for Soil Chemistry, C.N.R., Via Corridoni, 78, 56100, Pisa, Italy
Gianniantonio Petruzzelli
Levi-Minzi, R., Petruzzelli, G. The influence of phosphate fertilizers on Cd solubility in soil. Water Air Soil Pollut 23, 423–429 (1984). https://doi.org/10.1007/BF00284737
Received: 23 November 1983
Revised: 19 March 1984
Issue Date: November 1984
DOI: https://doi.org/10.1007/BF00284737
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