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Nickel and vanadium concentrations and its relation with sediment acute toxicity
M A Amezcua-Allieri1, L Salazar-Coria
1Safety and Environment Department, Mexican Petroleum Institute, Eje Central Lázaro Cárdenas No. 152, Colonia San Bartolo Atepehuacan, C.P. 07730, Mexico, DF, Mexico. mamezcua@imp.mx
Abstract:
Sediments from Pánuco River historically have contained elevated levels of numerous contaminants that may pose risks to ecological receptors and humans. Sediments were sampled and characterized to determine the acute sediment toxicity and its relationship with contaminants. Results demonstrated that toxicity was significantly correlated with fitness index (r = 0.82, p < 0.001), TOC (r = 0.55, p < 0.5), Ni (r = 0.95, p < 0.001), and V (r = 0.93, p < 0.001), but not with PAHs (r = 0.20, p < 0.5) during rainy and dry seasons. Although a great heterogeneity exists, the river outlet presents the biggest problems, due to dredging allow the metal desorption from solid to water phase, increasing the metal bioavailability.
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