First Measurements Of Methyl Tert-butyl Ether
(MTBE) In The Ambient Air In San Jose,
Costa Rica
Author(s)
G. Esquivel-Hernández, J. P. Sibaja-Brenes,
J. C. Mora-Barrantes & J. Valdés-González
Abstract
A great interest has arisen in establishing the impact of organic compounds on
human health and air quality, especially those compounds emitted by automotive
traffic. Knowledge of urban air pollutant concentrations is essential for the
determination of exposure levels. With this information public health problems
can be avoided and emissions sources can be identified. MTBE is one of such
compound because of its effects both to the environment and to humans. In
Costa Rica, as in many other parts of the world, MTBE has been added to
gasoline up to 10% v/v. This study investigates ambient air concentration of
MTBE in San Jose, Costa Rica. Samples were collected during October–
December 2005 using Carbotrap® cartridges and analyzed by thermal desorption
combined with capillary gas chromatography. MTBE levels ranged from < 0.1 to
7.0 ppbv, with the highest concentrations observed in the wet season’s months
(May to November). The highways and industrial areas were identified as
MTBE’s point sources, both related with vehicle emissions. High levels of
MTBE were also found in the vicinity of a gas station. These values represent the
first measurements made in a Central American location, but are similar to those
reported in other urban areas. The MTBE ambient air levels in San Jose, Costa
Rica were not known until this study in 2005.
Keywords: GC, MTBE, human health, urban air.
Keywords
GC, MTBE, human health, urban air.
Related Book
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