sampling gas/solid flow

Does anybody know any standard that I should follow in order to sample a gas flow with PVC powder. I will appreciate any comments or suggestions.
Thanks in advance.
Luiz Felipe
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The sample would be used for particle size distribution characterization.

gas
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EPA Method 17 provides a method for accurately obtaining particulate samples from gas streams. Go to www.epa.gov and drill down to the Method using their internal search engine.
--
Steven J. Cooke, FAIC
Process Systems Consulting, Inc.
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