2018 - Sustainable Industrial Processing Summit & Exhibition
4-7 November 2018, Rio Othon Palace, Rio De Janeiro, Brazil
Seven Nobel Laureates have already confirmed their attendance: Prof. Dan Shechtman, Prof. Sir Fraser Stoddart, Prof. Andre Geim, Prof. Thomas Steitz, Prof. Ada Yonath, Prof. Kurt Wüthrich and Prof. Ferid Murad. More than 400 Abstracts Submitted from about 60 Countries.
Abstract Submission
Login

DETAILLED PROGRAM OVERVIEW

Back
    Determination of Bioaccessibility of As and Pb in Soils Polluted With Mining Wastes: A New Equipment That Simplifies the Gastric and Intestinal Phases Measurements
    Thalia Rodriguez1; Margarita Gutierrez Ruiz2; Daniel Quiroz Vivanco2; Agueda Ceniceros2; Tania Tavares3; Arturo Aguirre Gomez4;
    1FACULDAD DE QUIMICA, UNAM, Mexico, Mexico; 2UNAM, Mexico, Mexico; 3UFBA, Rio de Janeiro, Brazil; 4FES CUAUTITLAN UNAM, Cuautitlan, Mexico;
    PAPER: 365/Non-ferrous/Keynote (Oral)
    SCHEDULED: 12:10/Mon./Pontal (50/2nd)



    ABSTRACT:
    The Mexican environmental standard for the remediation of polluted soil (NOM-147) contains an option to determine the remediation objectives based on human health risk assessment, using as a correction factor the bioavailability in vitro (bioaccessibility) [1, 2], in the gastric phase. Some studies in animals show that to determine bioaccessibility, it is better to take into consideration the gastric and intestinal phases [2].<br /> <br />To expedite the measurements of bioaccessibility a simple and low-cost equipment was developed which allows pH control and the addition of reagents without interrupting the process. This simplifies the measurement in the gastric and intestinal phases based on physiological extraction method (PBET) [3]. The new equipment was evaluated by measuring the bioavailability and bioaccessibility of As and Pb on standard reference soil (NIST Montana 2710). The results were compared with those reported by 14 laboratories [4]. The bioaccessibilties of Pb and As, considering only the gastric phase, were they like the results obtained "in vivo". The results including both phases were out of the "in vivo" range but were similar to the international results. We recommended the substitution of the equipment required by the NOM-147 [5] with the new extraction equipment designed to improve the procedure.

    References:
    [1] Boros K., Fortin, D, Jayawardene I., Chenier M. Levesque C. and Rasmussen, P.E, 2017. Int J Environ Res Public Health. 14(1): 92.<br />[2] Brooke N. S. [Dissertation] Graduate School of The Ohio State University. 2016. 176 p.<br />[3] M,V. Ruby, A. Davis, R. Schoof, S. Eberle, M. Sellstone, M. Environ. Sci. Technol. 30 (1996) 422-30.<br />[4] I. Koch, et al., Journal of Environmental Science and Health, Part A: Toxic/Hazardous Substances and Environmental Engineering, 48 (2013) 641-655.<br />[5] NOM-147. The official Mexican Standard NOM-147-SEMARNAT/SSA1-2004, that establishes the criteria to determine the concentrations of remediation of soil contaminated by heavy metals.