ORALS

SESSION: RecyclingSatPM3-R1	Kozlov International Symposium on Sustainable Materials Recycling Processes and Products (7th Intl. Symp. on Sustainable Materials Recycling Processes and Products)
Sat Oct, 26 2019 / Room: Ambrosia A (77/RF)
Session Chairs: TBA Session Monitor: TBA

18:15: [RecyclingSatPM314]
Gastrointestinal Simulation Reactor System For Bioaccessibility Determination Of Potentially Toxic Elements
Thalia Garcia Rodriguez¹ ; Daniel Quiroz Vivanco² ; Margarita Gutierrez Ruiz¹ ; Maria Fernanda Mehle Jordan³ ; Benjamin Varela Orozco⁴ ; Violeta Andrea Uribe Castillo⁵ ; ¹UNAM, Mexico, Mexico; ²Universidad Nacional Autónoma de México (UNAM), Ciudad de México, Mexico; ³Comisión Reguladora de Energía, Ciudad de Mexico, Mexico; ⁴Instituto de Ciencias Aplicadas y Tecnología, Universidad Nacional Autónoma de Mexico, Ciudad de Mexico, Mexico; ⁵Facultad de Quimica, Universidad Nacional Autonoma de Mexico, Ciudad de Mexico, Mexico;
Paper Id: 122 [Abstract]

Recently an innovative, patent pending reactor system based on the PBET method [1] (LABQA-RSGB), which simulates the human gastrointestinal tract, was developed and metal bioaccessibility was evaluated for mining waste solid samples [2]. Results obtained with this system are on par with those of US EPAs equipment from SW-846 Test Method 1340 [3].<br />The LABQA-RSGB system simulates stomach and small bowel conditions, while allowing for monitoring, pH adjustments and development of kinetic studies without interrupting the process nor altering the reactors’ temperature.<br />The current paper describes the improvements carried out on the LABQA-RSGB, in order to minimize systematic errors and potential sources of cross contamination, as well as allow design and reactor operation optimization [4]. Results of the bioaccessible fraction extracted with the new equipment (LABQA-SRSGB) were compared with those of the original LABQA-RSGB and US EPA equipments, using a reference material, internal controls and samples.<br />Coupled with continuous and simultaneous monitoring of pH, temperature and stirring within each reactor, the enhancements implemented in the LABQA-RSGB provide reliable results for various potentially toxic elements in different matrices.

References:
[1] M.W. Ruby, A. Davis, R. Schoof, S. Eberle, and C.M. Sellstone,"Estimation of Lead and Arsenic Bioavailability Using a Physiologically Based Extraction Test, "Environ. Sci. Technol. 30(2): 422-430, 1996.\n[2] Garcia Rodriguez, T. Gutierrez Ruiz M. E., Quiroz Vivanco D. Ceniceros Gomez A. Tavares T. Aguirre Gomez A. Determination of Bioaccessibility of As and Pb in Soils Polluted With Mining Wastes: A New Equipment That Simplifies the Gastric and Intestinal Phases Measurements. Sustainable Industrial Processing Summit & Exhibition, 4-7 November 2018, Rio Othon Palace, Rio De Janeiro, Brazil.\n[3] U.S. EPA, "Method 1340 in vitro bioaccessibility assay for lead in soil", Revision 1, February 2017, Update VI. EPA publication SW-846.\n[4] Quiroz Vivanco Daniel, (2018), Diseno de un equipo para realizar pruebas y analisis de bioaccesibilidad de metales en suelos, tesis de pregrado, Facultad de Quimica, Universidad Nacional Autonoma de Mexico, Ciudad de Mexico, Mexico.