| Sumario: | Atmospheric dust establishes an element of study to know the distribution of
pollutant particles such as heavy metals and their effects on ecological systems. The
objective was to determine the elemental composition of particles deposited in two
species of trees as an indicator of environmental impact in San Luis Potosí, México. The
distribution of Acacia farnesiana and Prosopis laevigata trees was taken into account
in five soil uses to collect leaf material and extract atmospheric dust during the spring
and summer seasons, determining the concentration of heavy metals using the ICP-MS
technique. The results indicated the presence of Al> Cu> Zn> Pb> V> As> Ni> Cd> Ti>
Cr> Co. Correlations with values of r2> 0.90 were presented between V-Ti, Ni-V, Ni-Ti,
Al-Ti and Cr-V. The species factor conditioned the concentrations of Al, Ti, V, Cr, Ni and
Zn mainly in the particles deposited in Prosopis leaves. Particles of nine elements were
conditioned by the activities of the five land uses, where the use of mineral soil affected
by the presence of Al, Cd, Co, Pb, Cu and Zn. Concentrations of Cd were 6.2 times higher
in the use of mining soil than in the agricultural sector; 5.9 and 5.4 times the concentrations
of Co and Pb in the use of mining soil with respect to the trade and service respectively.
The season had only significant effects on Cr and Pb particles. This study indicates
the existence of pollutants that can affect ecological systems so it falls within the context
of continued evaluation of environmental impacts.
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