Sorption of roxarsone onto soils with different physicochemical properties

摘要: Elevated roxarsone (ROX) concentrations in soils, caused by land application of ROX-bearing poultry litter, mandate investigation ROX sorption onto soils. Equilibrium and kinetic studies five soils were carried out to explore the relationship between parameters soil properties, reveal effects coexisting humic acid (HA), P(V), As(V), As(III) on transport. Experimental results indicated that reached equilibrium within 24 h, with pseudo-second order rate constants 5.74-5.26 × 10(2) g/(mg h); film intra-particle diffusion rate-limiting processes. involved partitioning adsorption phenomena; however, their relative contributions varied for different The maximum type, ranging from 0.59 4.12 mg/g. Results correlation analysis multiple linear regressions revealed capacities, partition coefficients, desorption percentages correlated especially iron content, total organic carbon, dissolved carbon. was affected more pH than initial ROX-containing solutions. Carboxylic amide functional groups determined be responsible capacities decreased presence HA, As(III), indicating mobility facilitated matter (DOM) competing anions.