| Summary: | Engineered nanoparticles (ENPs) present in consumer products are being released into the agricultural systems. There is little information about the direct effect of ENPs on phosphorus (P) availability, which is an essential nutrient for crop growthnaturally occurring in agricultural soils. The present study examined the effect of 1, 3, and 5% doses of Cu<sup>0</sup> or Ag<sup>0</sup> ENPs stabilized with L-ascorbic acid (suspension pH 2–3) on P ad- and desorption in an agricultural Andisol with total organic matter (T-OM) and with partial removal of organic matter (R-OM) by performing batch experiments. Our results showed that the adsorption kinetics data of H<sub>2</sub>PO<sub>4</sub><sup>−</sup> on T-OM and R-OM soil samples with and without ENPs were adequately described by the pseudo-second-order (PSO) and Elovich models. The adsorption isotherm data of H<sub>2</sub>PO<sub>4</sub><sup>−</sup> from T-OM and R-OM soil samples following ENPs addition were better fitted by the Langmuir model than the Freundlich model. When the Cu<sup>0</sup> or Ag<sup>0</sup> ENPs doses were increased, the pH value decreased and H<sub>2</sub>PO<sub>4</sub><sup>−</sup> adsorption increased on T-OM and R-OM. The H<sub>2</sub>PO<sub>4</sub><sup>−</sup> desorption (%) was lower with Cu<sup>0</sup> ENPs than Ag<sup>0</sup> ENPs. Overall, the incorporation of ENPs into Andisols generated an increase in P retention, which may affect agricultural crop production.
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