| Full text | |
| Author(s): |
Martinez-Mejia, Monica J.
;
Sato, Isabela
;
Rath, Susanne
Total Authors: 3
|
| Document type: | Journal article |
| Source: | Environmental Science and Pollution Research; v. 24, n. 19, p. 12-pg., 2017-07-01. |
| Abstract | |
Veterinary antimicrobials are emerging environmental contaminants of concern. In this study, the sorption of enrofloxacin (ENR) onto humic acids (HAs) extracted from three Brazilian soils was evaluated. HAs were characterized by elemental analysis and solid C-13 nuclear magnetic resonance spectroscopy. The sorption of ENR onto HAs was at least 20-fold higher than onto the soils from which they were separated. Ionic and cation bridging are the primary interactions involved. The interactions driven by cation exchange are predominant on HAs, which appear to have abundant carboxylic groups and a relatively high proportion of H-bond donor moieties with carbohydrate-like structures. Interactions explained by cation bridging and/or surface complexation on HAs are facilitated by moieties containing conjugated ligands, significant content of oxygen-containing functional groups, such as phenolic-OH or lignin-like structures. HAs containing electron-donating phenolic moieties and carboxylic acid ligand groups exhibit a sorption mechanism that is primarily driven by strong metal binding, favoring the formation of ternary complexes between functional groups of the organic matter and drugs. (AU) | |
| FAPESP's process: | 12/01767-0 - Sorption and degradation of veterinary drugs in soil |
| Grantee: | Susanne Rath |
| Support Opportunities: | Regular Research Grants |
| FAPESP's process: | 13/09543-7 - Residues of veterinary drugs in the environment |
| Grantee: | Susanne Rath |
| Support Opportunities: | Research Projects - Thematic Grants |