title: Phosphorus leaching from a sandy soil in the presence of modified and un-modified adsorbents.
abstract: Phosphorus (P) leaching from a sandy soil was investigated in the presence of modified and unmodified clay minerals and nanoparticles (NPs). Compared with control soil, amended soil with NPs had the highest percentage of P retention than amended soil with clay minerals. Among the adsorbents used, the highest percentage of P retention was produced by Al₂O₃-chitosan while the lowest percentage of P retention was by zeolite. Data measured for P leaching after using adsorbents were used to predict P leaching using transport model. PHREEQC model was able to model P leaching from control and amended soil. After leaching, P values in control and amended soil were fractionated by a sequential extraction procedure. Concentration of P in Ca-bound fraction (HCl-P) after application of modified and unmodified clay minerals and NPs (except TiO₂ and Al₂O₃) increased and decreased, respectively. Saturation indices (SIs) and P speciation were assessed using the Visual MINTEQ version 2.3 program. According to the SIs, leaching P from control and amended soil with different adsorbent was controlled by dissolution of hydroxyapatite. The results indicated that used adsorbents can reduce P leaching from the sandy soil. Thus, retention of P by amended soil reduced a risk in terms of groundwater contamination with P.
authors.affiliation: Department of Soil Science, College of Agriculture, Bu-Ali Sina University, Hamedan, Iran, sm_moharami@yahoo.com.
authors.forename: Somayeh
authors.initials: S
authors.lastname: Moharami
authors.forename: Mohsen
authors.initials: M
authors.lastname: Jalali
mesh_terms: D000042:Absorption; D004784:Environmental Monitoring; D052918:Environmental Restoration and Remediation / Q000379:methods*; D010758:Phosphorus / Q000032:analysis*; D012987:Soil / Q000737:chemistry*; D012989:Soil Pollutants / Q000008:administration & dosage*
chemical_list: D012987:Soil; D012989:Soil Pollutants; D010758:Phosphorus