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Comparison of two atmospheric sampling methodologies with non-parametric statistical tools

By Maria João Nunes, Maria Filomena Camões, Francis McGovern, Sebastião Santos and Frank Raes

Abstract

In atmospheric aerosol sampling, it is inevitable that the air that carries particles is in motion, as a result of both externally driven wind and the sucking action of the sampler itself. High or low air flow sampling speeds may lead to significant particle size bias. The objective of this work is the validation of measurements enabling the comparison of species concentration from both air flow sampling techniques. The presence of several outliers and increase of residuals with concentration becomes obvious, requiring non-parametric methods, recommended for the handling of data which may not be normally distributed. This way, conversion factors are obtained for each of the various species under study using Kendall regression

Topics: atmospheric sampling, aerosol analysis, non-parametric statistics
Publisher: Sociedade Brasileira de Química
Year: 2005
OAI identifier: oai:scielo:S0100-40422005000200002
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