383 MABIOMET a new mobile device for monitoring the bioaccessibility of toxic substances at mining soils * M. C. Parodi 1*; J. Mendoza2 ; K. M. Alencar1; D. Fonseca 1; M. Montenegro3 1. Universidad Tecnológica Metropolitana, Faculty of Engineering, Department of Industry 2. Universidad de Chile, Faculty of Chemical Sciences and Pharmaceutics, Department of Inorganic Chemistry and Analytics. 3. Universidad Tecnológica Metropolitana, Faculty of Sciences, Department of Maths * Presenting author cparodi@utem.cl; Av. José Pedro Alessandri 1242, CP 7800002, Ñuñoa, Santiago, Chile. ABSTRACT MABIOMET is a transportable and lightweight device, which can operate reliably and replicably, quantifying the bioaccessibility of heavy metals and metalloids in the laboratory according to the Unified Bioaccessibility Method (UBM) and ISO17942. This study shows the feasibility and efficacy in its measurements at laboratory scale for the two stages of the bioaccessibility in vitro study ("gastric" and "gastrointestinal") in four phases. The device integrates technological innovation and ensures the transition towards green mining. This case study, carried out with abandoned tailings in the Coquimbo Region of Chile, demonstrates the feasibility and effectiveness of its laboratory-scale measurements for the two stages of the in vitro bioaccessibility study (gastric and gastrointestinal) in four phases. First phase: implementing the UBM method in the laboratory. Obtained results show the measurements were within the reliability range of the certified material BGS-102: As 5.4 ppm ± 2.4 and Pb 13.6 ppm ± 6, with an average relative standard deviation (RSD%) of 18% and 8%, respectively. Second phase: 15 repetitive tests were carried out in MABIOMET for both stages with the certified material BGS102 and the average bioaccessible concentrations of As and Pb were within the material's confidence limit, with an RSD of 7% and 17%, respectively. Third phase: 15 repetitive tests were performed on the same representative sample of an abandoned tailing pile, showing that the results obtained for Pb, Cu, Fe and Zn were within the confidence limits established in the UBM method original in the laboratory, with an RSD of 4.3%, 2.4%, 11.8% and 4.6%, respectively. Four Phase: two repetitive tests were with representative samples in the 5 abandoned tailings. The average standard deviation for both stages of the UBM process was less than 20% for the set of elements analyzed (As, Pb, Cu, Fe, Pb and Zn) These results validate the scaling, performance and design of the MABIOMET equipment in the laboratory. The result of integrated monitoring includes the delivery of spatial risk maps and the quantification of the
RkJQdWJsaXNoZXIy MTM0Mzk2