Exposure Assessment: The Influence Of
Environmental Monitoring Methodology
Author(s)
S. Viegas, J. Prista & M. Gomes
Abstract
Exposure assessment is an important step of risk assessment process and has
evolved more quickly than perhaps any aspect of the four-step risk paradigm
(hazard identification, exposure assessment, dose-response analysis, and risk
characterization). Nevertheless, some epidemiological studies have associated
adverse health effects to a chemical exposure with an inadequate or absent
exposure quantification.
In addition to the metric used, the truly representation of exposure by
measurements depends on: the strategy of sampling, random collection of
measurements, and similarity between the measured and unmeasured exposure
groups.
Two environmental monitoring methodologies for formaldehyde occupational
exposure were used to assess the influence of metric selection in exposure
assessment and, consequently, in risk assessment process. In one of the
methodologies, environmental samples were obtained by personal air sampling,
and formaldehyde levels were measured by GC analysis and time-weighted
average (TWA8) estimated according to the NIOSH 2541 method. The second
methodology aimed to measure ceiling values of formaldehyde using Photo
Ionisation Detection equipment with simultaneously video recording. The
NIOSH method data showed that exposure can be considered low, while results
Keywords
exposure assessment, environmental monitoring methodology, risk assessment, formaldehyde exposure
Related Book
Other papers in this volume
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