Diesel Particulate Matter Sampling, Analysis, and Products

Laboratory

Since our diesel particulate matter (DPM) laboratory opened in 2002, we have helped mine operators in the United States and abroad to analyze DPM samples, lower their workers’ DPM exposure, and maintain regulatory compliance.
Methodology: We use the National Institute for Occupational Safety and Health (NIOSH) 5040 method to analyze DPM sample cassettes. This involves using thermal-optical techniques to determine a sample’s total carbon content as a surrogate for DPM and to calculate the elemental and organic carbon fractions. We report our laboratory results in terms of total and elemental carbon present on each sample filter, in units of micrograms (µg). Next, we use the pump run-time and flow rate to work out the sampled concentration of DPM in terms of micrograms per cubic meter (µg/m3). For each sample analyzed, we provide a printout of the thermogram generated.
Quality assurance: In all of our laboratory work, we adhere to exacting quality assurance practices, including following strict sample tracking and chain of custody procedures as well as periodically testing sampling apparatus and results

Sampling equipment

We design and deliver full, ready-to-use sampling packages comprising all the pumps and support equipment required for DPM compliance testing. Our equipment suppliers include SKC, MSA, and Gilian. The DPM cassette options are as follows:
Standard cassettes: Consist of a quartz fiber filter without an impactor. These economical cassettes may be appropriate for mines without carbonate interference, but the Mine Safety and Health Administration (MSHA) reports that their sample results are ~25% higher than for JIC cassettes under similar circumstances
JIC cassettes: Containing two quartz fiber filters and a sub-micron precision-jeweled impactor. These SKC cassettes are approved by the MSHA.


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SRK North America