For problems with accessibility in using figures and illustrations, please contact the Salt Lake Technical Center at 801-233-4900. These procedures were designed and tested for internal use by OSHA personnel.

Mention of any company name or commercial product does not constitute endorsement by OSHA. Date: April 1998 Chemist: Warren Hendricks Organic Methods Evaluation Branch OSHA Salt Lake Technical Center Salt Lake City, UT INTRODUCTION The purpose of this work was to determine sampling rate variation for SKC 575 Series Passive Samplers.

The concept of sampling rate variation in diffusive sampling was established in previous work and it was defined as the equivalent of sampling pump error in active sampling (). Tests were conducted to determine sampling rate variation for 3M 3520 diffusive samplers in that work. These tests must be performed for each unique design of sampler because the variation is presumed to be a function of sampler design. The tests are based on exposing a specific design of sampler to a five-component solvent mixture in a 16-run factorial test. The solvent mixture is composed of different classes of chemicals anticipated to provide a difficult, but realistic, challenge to the sampler.

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The factorial test involves sample collection from test atmospheres composed of 16 different combinations of high and low levels of analyte concentrations, high and low relative humidities, high and low face velocities, long and short sampling times, and parallel and perpendicular sampler orientation to the air flow in a test chamber. Effects of each environmental factor on sampler performance, and of possible factor interactions, are revealed by this test.

This factorial test is based on that described in the very comprehensive NIOSH Protocol for the Evaluation of Passive Monitors (). Sampling rates are determined for each component of the solvent mixture for each run of the 16-run factorial test. A relative standard deviation (RSD) is calculated from the 16 independently determined sampling rates for each constituent of the mixture. The RSDs are pooled if they are homogenous. The pooled RSD is a measure of sampling rate variation for several very different classes of chemicals under several very different environmental conditions.