POTENTIAL INFLUENCE OF EMISSIONS AND TRANSPORT OF N AND S IN THE ORIZABA VALLEY, VERACRUZ, MEXICO
There have been few studies in Mexico about the atmospheric deposition of acidified substances that modify the balance of tropical mountain systems, which are highly sensitive to N and S compound deposits. The objective of this study was to evaluate the spatial and temporal distribution of N and S deposits during a year, in the Orizaba Valley, and to estimate the effect produced by the large-scale transport of SO2 regional emissions in S atmospheric deposits. The hypothesis was that N and S deposits in the Orizaba Valley are produced by local and regional sources, respectively. N and S deposits were measured in 2015, using passive collectors with ion-exchange resin (RII) in 10 sites, throughout the Orizaba Valley, Veracruz, Mexico. The ions (NO3 ?, NH4 ? and SO4 2?) retained in the RII column were extracted using KCl 2 N, analyzed using the indophenol blue method, and subject to a turbidimetric analysis. The annual average N and S deposits were 1.42 and 27.25 kg ha?1 year?1 . The S flow exceeded almost sixfold the critical load proposed for sensitive areas. This represents a potential acidification threat for the region. During the rainy and cold fronts (nortes) seasons, large-scale transport was evident. The NO3 ? and NH4 ? and atmospheric deposits had a local origin while SO4 2? had a regional origin; the contribution was higher when the trade and north winds blew in the Orizaba Valley. The SO4 2? background levels increased as a result of the transport of emissions released by the platforms in the Sonda de Campeche and by industrial sources in northern Mexico that influence S deposit in that region of Veracruz.
| Main Authors: | , , , , , |
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| Format: | Digital revista |
| Language: | spa |
| Published: |
Colegio de Postgraduados
2018
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| Online Access: | https://www.agrociencia-colpos.org/index.php/agrociencia/article/view/1695 |
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