Effects of organic ligands on the adsorption of trace elements onto metal oxides and organo-mineral complexes

作者: A. Violante , M. Ricciardella , M. Pigna , R. Capasso

DOI: 10.1016/B978-044451997-9/50007-6

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摘要: ABSTRACT Biomolecules released by plants and microorganisms have an important effect on the mobility of trace elements in soil environments. We found that presence low-molecular-mass organic ligands (e.g. oxalate (OX) citrate), adsorption heavy metals short-range-ordered oxides increased with increase initial ligand/Me molar ratio (rL) up to 10, whereas well-crystallized Al- or Fe-oxides, initially 2.5 (goethite) 5 (bayerite) then decreased. The rL value, nature metals, surface properties sorbents are critical determining whether metal is enhanced inhibited. Organic inhibit anionic form (arsenate (As), arsenite, selenite). metalloids variable-charge minerals influenced not only presence, nature, concentration but also sequence addition sorbents. Trace cationic show a different capacity onto oxides, matter, organomineral complexes. Heavy compete for sorption sites these components. However, we Cu inhibits Zn more ferrihydrite than complex humic acid-like material.

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