Standard Practice for Evaluating the Performance of Respirable Aerosol Samplers

Importancia y uso:

5.1 This practice is significant for determining performance relative to ideal sampling conventions. The purposes are multifold:

5.1.1 The conventions have a recognized tie to health effects and can easily be adjusted to accommodate new findings.

5.1.2 Performance criteria permit instrument designers to seek practical sampler improvements.

5.1.3 Performance criteria promote continued experimental testing of the samplers in use with the result that the significant variables (such as wind speed, particle charge, etc.) affecting sampler operation become understood.

5.2 One specific use of the performance tests is in determining the efficacy of a given candidate sampler for application in regulatory sampling. The accuracy of the candidate sampler is measured in accordance with the evaluation tests given here. A sampler may then be adopted for a specific application if the accuracy is better than a specific value.

Note 1: In some instances, a sampler so selected for use in compliance determinations is specified within an exposure standard. This is done so as to eliminate differences among similar samplers. Sampler specification then replaces the respirable sampling convention, eliminating bias (3.2.6), which then does not appear in the uncertainty budget.

5.3 Although the criteria are presented in terms of accepted sampling conventions geared mainly to compliance sampling, other applications exist as well. For example, suppose that a specific aerosol diameter-dependent health effect is under investigation. Then for the purpose of an epidemiological study an aerosol sampler that reflects the diameter dependence of interest is required. Sampler accuracy may then be determined relative to a modified sampling convention.

Subcomité:

D22.04

Referida por:

D1356-20A, D1356-20A, D1356-20A, D7948-20, D8358-21

Volúmen:

11.07

Número ICS:

13.040.99 (Other standards related to air quality)

Palabras clave:

aerosol; air monitoring; bias; confidence; conventions; deposition; evaluation; fractions; particle; particulates; penetration; performance; random variation; respirable; sampling and analysis; sampling efficiency; size-selective; tolerance; uncertainty; workplace atmospheres;