Standard Practice for Evaluating the Performance of Diffusive Samplers

Importancia y uso:

5.1 Gas or vapor sampling is often accomplished by actively pumping air through a collection medium such as activated charcoal. Problems associated with a pump – inconvenience, inaccuracy, and expense – are inextricable from this type of sampling. The alternative covered by this practice is to use diffusion for moving the compound of interest onto the collection medium. This approach to sampling is attractive because of the convenience of use and low total monitoring cost.

5.2 However, previous studies have found significant problems with the accuracy of some samplers. Therefore, although diffusive samplers may provide a plethora of data, inaccuracies and misuse of diffusive samplers may yet affect research studies. Furthermore, worker protections may be based on faulty assumptions. The aim of this practice is to counter the uncertainties in diffusive sampling through achieving a broadly accepted set of performance tests and acceptance criteria for proving the efficacy of any given diffusive sampler intended for use.

Subcomité:

D22.04

Referida por:

D1356-20A, D7440-23, D1356-20A, D1356-20A, D7440-23

Volúmen:

11.07

Número ICS:

13.040.30 (Workplace atmospheres)

Palabras clave:

accuracy; air monitoring; bias; concentration; diffusive; evaluation; gases; passive; performance; precision; sampling and analysis; samplers; tests; uncertainty; vapors; workplace atmospheres;