Ionic components from rain, emission sources and seasonal meteorological conditions in Cuba
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Abstract
of rain on the origin of pollutants affecting air quality in Cuba in order to improve their management. Rainwater samples were gathered from 11 pollution
monitoring stations for Cuba´s atmosphere between November 2008 and April 2010. The different analyses were conducted using ion chromatography
equipment with a conductivity detector. The volume- weighted average pH was slightly basic for most stations, with the exception of the Gran Piedra, Pinares
de Mayari and Palo Seco stations. For all stations, the concentrations of NO3 - and non sea salt SO4 2-were higher than the background values reported
for the northern hemisphere, and the highest concentrations were observed in areas directly influenced by anthropogenic sources. Also, rates of sulfate deposition were high in parts of Cuba, similar to the
rates in some US locations where adverse environmental effects have occurred.The major anthropogenic sources of ions are the burning of fossil fuel by
power plants, cement factories, nickel-processing industries, and the burning of biomass through poor agricultural practices. The western region exhibited
increased concentrations of NO3 - and SO4 2- during the dry season, most likely due to the long-range transport of pollutants from the northeastern United
States and locally. The study concludes that only a small fraction of the potentially acidic ions contributes to the free acidity of Cuba’s rainwater, mainly
due to the neutralizing capacity of Ca2+ and NH4 +.
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