Determination of carbonyls and their sources in three sites of the metropolitan area of Costa Rica,Central America |
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Authors: | Jorge Herrera Murillo José Félix Rojas Marín Susana Rodríguez Román |
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Institution: | (1) Istituto Inquinamento Atmosferico CNR, Via Salaria km 29.300, CP 10, I-00016 Monterotondo Scalo (RM), Italy; |
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Abstract: | Ambient levels of carbonyl compounds and their possible sources were studied at three places in the metropolitan area of Costa
Rica, including a residential, an industrial, and a commercial downtown area with high vehicular flow, during the periods
of April–May and September–December 2009. Fifteen carbonyl compounds were identified in the ambient air, of which acetone
was the most abundant carbonyl, followed by formaldehyde and acetaldehyde. Concentrations were highest in rainy season at
all sites and lower in dry season. These decreases in concentration are explained by the influences of both photochemical
reactions and local meteorological conditions. The strong correlation between C1–C2 and C3 indicated a common origin for these
carbonyls. The C1/C2 ratios varied between 0.49 to 1.05, values which can be considered typical of an urban area. |
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