“…For example, some studies like the one of Wang et al (2017) have reported the presence of V, Cr, Pb, and Ni in the rivers sediments and the coastal areas of sites adjacent to oil facilities. These reports are consistent with studies carried out at two oil assets: at Cinco Presidentes in Veracruz, and at Samaria-Luna in Tabasco, in which Pb, Zn, Na, and Ni outside of regulatory ranges have been detected, as well as V, Cr, and Cd have been observed in different concentrations (Ruiz-Fernández et al, 2019;Gómez-Mellado et al, 2020;Machain-Castillo et al, 2020). In addition, in some spills of crude oil and added asphalt, concentrations of Hg, Cd, Ni, As, Ba, Be, Ag, Se, and Ta were observed by Mendoza-Carranza et al (2016) and Saadati et al (2020).…”