Assessment of effect of pH, temperature and organic matter on zinc mobility in a hydromorphic soil

摘要: Before using Zn-rich sewage sludge in agricultural soil, it is very important to study the behavior of this pollutant and its mobility semiarid climate prevent risk that may pose on human health. Batch technique was used sorption desorption experiments zinc onto hydromorphic soil with a loamy texture. Results showed effect pH ranged between 6 7.8 amount negligible. Whereas coefficient distribution K d at pH = 6 1–3 times greater than pH = 7.8. The increase temperature from 25 ± 2 40 ± 2 °C increased uptake by 4.37–63.2 % 3.75–27.09 % 6, respectively. removal organic matter slightly enhanced alkaline pH; while remarkably reduced acidic suggesting depended significantly pH. All data fitted only Freundlich equation. Also, energies (E) calculated Dubinin–Radushkevich equation were high implicating main process chemisorption. Zinc speciation after added mostly bonded oxides fraction two investigated values similar, not affected removal. percentage desorbed (bioavailable) higher into 0.05 M ethylenediaminetetraacetic acid (about 20 %) distilled water (≤4 %). From principal component analysis, we deduced factor controlling best parameter describes mechanism retention soil.