摘要：Wet deposition was collected in
Mexico City (MC), Metropolitan Area of Monterrey (MAM) and El Chico National
Park (ECNP), during 2009 and 2010. pH,
conductivity, Cl-, , Na+, K+, Ca2+ and Mg2+ were determined. In MC, sulphate levels were greater than
nitrate levels, and NH4 had mixed sources (vehicular emissions and agriculture
activities). MAM had markedly alkaline atmospheric deposition, Na+ and Cl-levels were unexpectedly high, especially during hurricane
“Alex”. Low pH values were found in ECNP and nitrate concentrations were high,
suggesting the influence of a local source (forest fires). Deposition fluxes
(Kg.ha-1yr-1) for N-NO3, N-NH4 and
S-SO4 were 1.36, 2.74 and 4.84 for MAM; 7.27, 0.57 and 4.32 for
ECNP; and 5.97, 4.96 and 6.78 for MC, respectively. Nitrogen deposition fluxes
in ECNP were high considering that this site is a natural reserve.
