The oxidative potential and biological effects induced by PM₁₀ obtained in Mexico City and at a receptor site during the MILAGRO Campaign
2011
Quintana, Raúl | Serrano, Jesús | Gómez de la Torre, Virginia | de Foy, Benjamin | Miranda, Javier | Garcia-Cuellar, Claudia | Vega, Elizabeth | Vázquez-López, Inés | Molina, Luisa T. | Manzano-León, Natalia | Rosas, Irma | Osornio-Vargas, Alvaro R.
As part of a field campaign that studied the impact of Mexico City pollution plume at the local, sub-regional and regional levels, we studied transport-related changes in PM₁₀ composition, oxidative potential and in vitro toxicological patterns (hemolysis, DNA degradation). We collected PM₁₀ in Mexico City (T₀) and at a suburban-receptor site (T₁), pooled according to two observed ventilation patterns (T₀ → T₁ influence and non-influence). T₀ samples contained more Cu, Zn, and carbon whereas; T₁ samples contained more of Al, Si, P, S, and K (p < 0.05). Only SO₄ ⁻² increased in T₁ during the influence periods. Oxidative potential correlated with Cu/Zn content (r = 0.74; p < 0.05) but not with biological effects. T₁ PM₁₀ induced greater hemolysis and T₀ PM₁₀ induced greater DNA degradation. Influence/non-influence did not affect oxidative potential nor biological effects. Results indicate that ventilation patterns had little effect on intrinsic PM₁₀ composition and toxicological potential, which suggests a significant involvement of local sources.
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