In Honor of Nobel Laureate Prof. M Stanley Whittingham
| EFFICIENCY OF EDDS IN PHYTOREMEDIATION PROCESS OF COPPER-CONTAMINATED MINE WASTE Mayra C. Rodriguez Lopez1; Hector Gamboa Baez2; Joel Lopez Perez3; Victor Wilson Corral4; 1CENTRO DE ESTUDIOS JUSTO SIERRA (CEJUS), Surutato, Mexico; 2TECNOLóGICO NACIONAL DE MéXICO/INSTITUTO TECNOLóGICO SUPERIOR DE ELDORADO, Eldorado, Mexico; 3CENTRO DE INNOVACION Y DESARROLLO EDUCATIVO (CIDE) A. C, Culiacan, Mexico; 4CENTRO DE INNOVACION Y DESARROLLO EDUCATIVO (CIDE)-SECCION SINALOA, Culiacan, Mexico; PAPER: 185/Mineral/Regular (Oral) OS SCHEDULED: 17:10/Wed. 29 Nov. 2023/Sunflower ABSTRACT: Mining industry annually generates millions of tons of waste that needs to be adequately managed in order to prevent environmental risks. Assisted phytoremediation with chelating agents has been proposed as a viable alternative for cleaning of Cu-contaminated soils [2]. Particularly, ethylenediaminedisuccinic acid (EDDS) has been suggested as an option because it has shown the ability to increase the bioavailability of metals such as Cu [3]. In assisted phytoremediation EDDS has been characterized by a short half-life in the environment [4], and as not leaching chemical. In this study, the efficiency of 4 doses of EDDS in the phytoremediation of Cu lodged in a mine waste substrate was evaluated. Helianthus annuus L. (sunflower) plant species was cultivated in homemade greenhouse for 10 weeks in a previously prepared mining waste substrate. After this period, 4 treatments (0, 0.2, 0.4 and 0.8 mMol/kg) of EDDS were applied to the substrate to improve the bioavailability of Cu. One week later, plants were harvested, prepared, and analyzed by atomic absorption spectrometry to determine Cu concentrations in plant tissue. According to results, the dose of 0.8 mMol/kg showed the highest efficiency. In this case, the translocation factor was equivalent to 0.65, which was 116% higher than recorded in the plants used as control (0.30). In addition, the Cu bioconcentration factor, in the aerial part of plant, for the dose of 0.8 mMol/kg was 8.32, which is 407% higher than recorded in the aerial part of the controls (1.64). Regarding the underground part of the plants, the bioconcentration factor occurred in the dose of 0.8 mMol/kg was 12.85, which was 137% higher than registered in the underground part of the plants used as a control (5.42). Our results suggest that a phytoremediation process of mine waste substrate, assisted with EDDS, could be viable using H. annuus. This study provides useful data for the design of efficient strategies in Cu phytoremediation processes, for waste substrates generated by the mining industry. References: [1] Helser, J., E. Vassilieva, and V. Cappuyns, Environmental and human health risk assessment of sulfidic mine waste: Bioaccessibility, leaching and mineralogy. Journal of Hazardous Materials, 2022. 424: p. 127313.<br />[2] Ju, W., et al., Co-inoculation effect of plant-growth-promoting rhizobacteria and rhizobium on EDDS assisted phytoremediation of Cu contaminated soils. Chemosphere, 2020. 254: p. 126724.<br />[3] Wang, X., et al., Biodegradation and effects of EDDS and NTA on Zn in soil solutions during phytoextraction by alfalfa in soils with three Zn levels. Chemosphere, 2022. 292: p. 133519.<br />[4] Tandy, S., et al., Extraction of Heavy Metals from Soils Using Biodegradable Chelating Agents. Environmental Science & Technology, 2004. 38(3): p. 937-944. |
