Method 202 - Condensable Particulate Matter (Revised 12/1/2010)
FREQUENTLY ASKED QUESTIONS (FAQS) for Method 202
What are the analytical procedures for CPM Container #1 (Section 11.2.2)?
Is the hexane organic fraction used for condensable analysis at the bottom or the top of the separatory extraction funnel?
The organic layer that is evaporated to determine the residual organic condensable material in Method 202 is the top layer in the separatory funnel extraction. As of March 2014, the method text in Section 11.2.2 has been updated to clarify this procedure. The previous version incorrectly stated the organic layer would be on the bottom.
If significant sampling time or significant quantities of water are anticipated during Method 202 sampling, what can be done to purge SO2 from the sample to minimize artifact formation?
If you anticipate long sampling times (over 2 hours) or high moisture from your source you may choose to recover the impinger catch from method 202 and perform one or more intermediate impinger purges within the requirements of the method. The entire first impinger from the sampling train is removed, the water is weighed to determine its contribution to the moisture calculation, and the short stem impinger is replaced with a long stem impinger that reaches into the liquid as required by the method. The impinger followed by a CPM filter is purged under pressure as specified in the method and then added to the appropriate sample container.
What is the rational for switching from acetone/methylene chloride to Hexane/acetone for Method 202?
Why can’t Method 5B, 5E, 5F, 5G, or 5H be used to collect FPM in combination with M- 202?These variants of Method 5 even when combined with Method 202 do not yield total particulate matter. Some of these methods heat the filter and bias the results low compared to Method 202. If you were to combine one of these methods with Method 202 it may provide engineering assessment information but would not provide a consistent measurement of primary particulate matter consistent with the combination of filterable particulate and condensable particulate allowed in Method 201A and Method 202. With that said, there may be some State rules that limit a component of particulate matter (e.g., nonsufluric acid particulate). In that case, you should perform testing using the same test method which the rules or regulatory authority require.
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