Metal(loid) bioaccessibility and risk assessment of ashfall deposit from Popocatépetl volcano, Mexico
Por:
Schiavo B., Meza-Figueroa D., Morton-Bermea O., Angulo-Molina A., González-Grijalva B., Armienta-Hernández M.A., Inguaggiato C., Berrellez-Reyes F., Valera-Fernández D.
Publicada:
1 ene 2024
Resumen:
Ash emission from volcanic eruptions affects the environment, society, and human health. This study shows the total concentration and lung bioaccessible fraction of eight potential toxic metal(loid)s in five Popocatépetl ashfall samples. Mineralogical phases and particle size distribution of the ashfall were analyzed by X-ray diffraction (XRD) and Scanning Electron Microscope (SEM) techniques, respectively. The bioaccessibility test of Gamble solution (GS) and Artificial Lysosomal Fluid (ALF) were conducted to simulate extracellular (pH 7) and intracellular (pH 4.5) conditions, respectively. The studied metal(loid)s showed the following total concentration (mg kg-1): 1.98 (As), 0.17 (Cd), 134.09 (Cr), 8.66 (Cu), 697.33 (Mn), 55.35 (Ni), 8.77 (Pb), and 104.10 (Zn). Geochemical indices suggested that some metal(loid)s are slightly enriched compared to the local soil background concentrations. Several mineralogical phases were identified in the collected ashfall deposits, such as plagioclase, pyroxene, and Fe–Ti oxide, among others. According to the risk assessment results, the non-carcinogenic risk related to ashfall exposure returns an HQ > 1 for children. In contrast, the estimation of carcinogenic risk was found to be within the tolerable limit. Metal(loid)s showed low bioaccessibility (< 30%) in GS and ALF, with the highest values found in ALF solution for As (12.18%) and Cu (7.57%). Despite their metal-bioaccessibility, our findings also showed that dominant ash particle size ranged between fine (< 2.5 µm) and extremely fine (< 1 µm), considered highly inhalable fractions. The results obtained in this work indicate that volcanic ashes are bioinsoluble and biodurable, and exhibit low bioaccessibility when in contact with lung human fluids. © The Author(s) 2024.
Filiaciones:
Schiavo B.:
Instituto de Geofísica, Universidad Nacional Autónoma de México, Mexico City, 04510, Mexico
Meza-Figueroa D.:
Departamento de Geología, Universidad de Sonora, Hermosillo, 83000, Mexico
Morton-Bermea O.:
Instituto de Geofísica, Universidad Nacional Autónoma de México, Mexico City, 04510, Mexico
Angulo-Molina A.:
Departamento de Ciencias Químico-Biológicas, Universidad de Sonora, Hermosillo, 83000, Mexico
González-Grijalva B.:
Departamento de Geología, Universidad de Sonora, Hermosillo, 83000, Mexico
Armienta-Hernández M.A.:
Instituto de Geofísica, Universidad Nacional Autónoma de México, Mexico City, 04510, Mexico
Inguaggiato C.:
Departamento de Geología, Centro de Investigación Científica y de Educación Superior de Ensenada, Baja California (CICESE), Ensenada, Mexico
Berrellez-Reyes F.:
Departamento de Geología, Universidad de Sonora, Hermosillo, 83000, Mexico
Valera-Fernández D.:
Instituto de Geología, Universidad Nacional Autónoma de México, México City, 04510, Mexico
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