Bulk and mapping speciation analyses unveil the pattern and heterogeneity of cu species during organic waste treatment

Organic wastes (OWs) can be a common source of copper (Cu) contamination of agricultural soils. Here we conducted a comprehensive study of 22 raw and treated OWs sampled at 6 different full-scale OW treatment plants. Bulk XANES analysis findings indicated that the Cu oxidation state was subject to changes throughout the OW treatment process, mostly depending on the anaerobic/aerobic conditions prevailing in each treatment stage. These changes were independent of the OW origin (agricultural, urban or industrial). Cu(I) prevailed in raw OWs and digestates (88–100%), whereas Cu(II) dominated in composts (46–100%). Bulk EXAFS analysis confirmed these observations and revealed that Cu(I) species in raw OWs and digestates consisted mainly of Cu(I)-sulfide (76–100%), while Cu(II) species (60–100%) in composts were Cu(II)-citrate, Cu(II)-carbonate and amorphous Cu(II)-phosphate. Interestingly, we observed that anaerobic digestion was conducive to the formation of crystallized Cu(I)-sulfides at the expense of nanosized and poorly crystalline Cu(I)-sulfide species, and that the recalcitrant Cu(I) species in composts was always crystallized Cu(I)-sulfide. XANES imaging analysis revealed Cu(II) species present in low proportions (2–4%) that were not detected using bulk XAS analysis in raw OWs and digestates. This demonstrated the potential of XANES imaging for probing minor species in complex matrices.

Bibliographic Details

Main Authors:	Doelsch, Emmanuel, Le Bars, Maureen, Etschmann, Barbara, Formentini, Thiago Augusto, Legros, Samuel, Levard, Clément, Chaurand, Perrine, Basile-Doelsch, Isabelle, Rose, Jérôme, Brunetti, Gianluca, Doolette, Casey, Howard, Daryl L., Lombi, Enzo
Format:	article biblioteca
Language:	eng
Subjects:	Q70 - Traitement des déchets agricoles, P02 - Pollution, traitement des déchets, déchet organique, déchet agricole, compost, spectroscopie aux rayons x, http://aims.fao.org/aos/agrovoc/c_35352, http://aims.fao.org/aos/agrovoc/c_35237, http://aims.fao.org/aos/agrovoc/c_8683, http://aims.fao.org/aos/agrovoc/c_1795, http://aims.fao.org/aos/agrovoc/c_28566,
Online Access:	http://agritrop.cirad.fr/610182/ http://agritrop.cirad.fr/610182/3/doelsch-et-al-2024-bulk-and-mapping-speciation-analyses-unveil-the-pattern-and-heterogeneity-of-cu-species-during.pdf
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