Mi. Pengelly et al., THE APPLICATION OF A VALIDATION PROTOCOL TO A COLORIMETRIC DIFFUSIVE SAMPLER, The Annals of occupational hygiene, 38(2), 1994, pp. 161-170
A validation protocol has been developed by the Comite Europeen de Nor
malisation (CEN) in order to provide a standard evaluation procedure f
or the many new and existing diffusive sampling systems available for
determination of gases or vapours in workplace atmospheres. This study
reports the application of that protocol to a commercially available
colorimetric diffusive sampling device for acetone. The chosen samplin
g system was subjected to a series of standard experiments outlined in
the CEN protocol to determine the effects of face velocity, exposure
time, pollutant concentration, air temperature and relative humidity o
n sampler performance. Additional non-standard experiments were also c
arried out to determine the effects of periods of zero pollutant conce
ntration during sampling. The results of both standard and non-standar
d experiments have been used to calculate figures for the bias of the
sampling method and its overall relative uncertainty. Overall, it was
concluded that, with some modifications, the CEN protocol can be succe
ssfully applied to validating this type of colorimetric diffusive samp
ling device.