The effect of phosphate on the sorption of copper by acid soils

Zinc adsorption in acid soils

“…This hypothesis is supported by the different effect that is found in acid soils, where the presence of phosphorus increases the adsorption of Zn, and calcareous soils in which they obtained the opposite effect (Wang and Harrell, 2005). Both mechanisms, however, were discarded; the former because the addition of P to the clay fraction of two soils (samples 1 and 8) had no appreciable effect on the electric potential (Pérez-Novo et al, 2009) and the latter because there were no significant differences in pH between the samples containing some P or none. By way of example, consider the pH of samples 1 and 8; as can be seen, the pH changes caused by the addition of P were not significantly different from those observed in the samples to which no P was added (Fig.…”

“…4). Unlike copper, with which the pH rise caused by the addition of P appears to be one of the principal mechanisms (Pérez-Novo et al, 2009), pH raise is not a crucial variable as regards the increased adsorption of Zn in the presence of P. The increased adsorption of Zn in the presence of P may be the result of several concomitant effects, the most influential mechanism is seemingly related to the formation of complexes on adsorbing surfaces (particularly oxides containing previously adsorbed P). The importance of this mechanism has also been mentioned by Agbenin (1998).…”

Influence of N, P, and K application on Zea mays L. growth and Cu and Pb accumulation

“…Previously, P-induced Pb immobilization in soil was widely reported, which was achieved primarily through precipitation of pyromorphite in the P-fertilized treatments (Ma et al 1993, Ma andRao 1997). The least DTPA-extractable Cu concentrations in the PK treatment indicated that P application could also effectively increase Cu immobilization in soil, mainly through increasing pH (Pérez-Novo et al 2009). …”

Phosphate adsorption from aqueous solutions by disused adsorbents: Chitosan hydrogel beads after the removal of copper(II)

“…Recently, Perez-Novo et al [29] reported that phosphate can efficiently bind with Cu(II). Cu(II) can be effectively adsorbed and loaded onto CS from aqueous solutions.…”