Method 4

Determination of moisture content in stack gases

This method is used to collect a stack gas sample and determine its moisture content.  It is a promulgated method found in 40CFR Parts 60, 61 and 63. The sample is collected using components of a standard Method 5 sampling train consisting of a probe and series of impingers.  Two impingers are filled with a known amount of deionzied water and a third impinger filled with silica gel.  All impingers should be weighed to nearest 0.5 g.  After sample collection, the impingers are weighed again (to the nearest 0.5 g) to determine the weight gain.  The moisture content is then calculated.

Moisture content following procedures outlined in this method can also be determined from isokinetic sampling events using a Method 5 train, e.g. 0010, 0011, etc.

Note that it is also possible to determine the moisture content from a sample collected in a stainless steel canister.  The laboratory will pull a known volume of air from the canister through a silica gel tube.  The tube is weighed for weight gain and the moisure content is calculated.

(EPA 40CFR Part 60 Appendix A)


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Method Data

Hold Times, Preservatives, Preps, Collection, Analytical & Documentation
Holding Time:   None specified in method.
Preservatives:   None specified in method.
Required Preps:   None
Collection Method:   Method 5 train following EPA Method 4 procedures.
Analytical Methodology:   Gravimetric
Documentation:   4

Analyte List*

Analyte Formula CAS Number Detection Limit

* The analytes and detection limits listed for each method represent the typical detection limits and analytes reported for that particular method. Keep in mind that analyte lists may vary from laboratory to laboratory. Detection limits may also vary from lab to lab and are dependent upon the sample size, matrix, and any interferences that may be present in the sample.