Standard Practice for Controlling and Characterizing Errors in Weighing Collected Aerosols

Importancia y uso:

4.1 The weighing of collected aerosol is one of the most common and purportedly simple analytical procedures in both occupational and environmental atmospheric monitoring (for example, Test Method D4532 or D4096). Problems with measurement accuracy occur when the amount of material collected is small, owing both to balance inaccuracy and variation in the weight of that part of the sampling medium that is weighed along with the sample. The procedures presented here for controlling and documenting such analytical errors will help provide the accuracy required for making well-founded decisions in identifying, characterizing, and controlling hazardous conditions.

4.2 Recommendations are given as to materials to be used. Means of controlling or correcting errors arising from instability are provided. Recommendations as to the weighing procedure are given. Finally, a method evaluation procedure for estimating weighing errors is described.

4.3 Recommendations are also provided for the reporting of weights relative to LOD (see 3.2.6) and LOQ (see 3.2.7). The quantities, LOD and LOQ, are computed as a result of the method evaluation.

Subcomité:

D22.04

Referida por:

D1356-20A, D7440-23, D1356-20A, D1356-20A, D7440-23, D4532-22, D6061-01R18E01, D8358-21

Volúmen:

11.07

Número ICS:

13.040.99 (Other standards related to air quality)

Palabras clave:

blank; control filter; filter; foam; gravimetric; limit of detection; limit of quantitation; LOD; LOQ; sampling media; weighing; weight;