EPA Method 202 - Condesable Particulate Emissions




Method Overview

  • Isokinetic
  • In-stack filter (M17/201/201A/OTM 27) or heated out of stack filter (M5).
  • "Condensable" particulate matter passes through a filter and condenses in dry impingers and are caught on a CPM Filter.
  • Can readily be (and commonly is) combined with a filterable PM Method.
  • Tester may adjust out-of-stack (e.g. M5) filter temperature to suit source specific conditions.

Target Compounds

  • Condensable Particulate Matter (CPM) -- those substances that pass through the heated filter to condense in the dry impinger components of the sample train.

Performance Tips

  • The CPM is collected in dry impingers after filterable particulate material has been collected on filters maintained above 30°C (85°F) using Method 5, 17, 201A or OTM 27.
  • The organic and aqueous fractions of the impingers and an out-of-stack CPM filter are then taken to dryness and weighed.
  • The total of all fractions represents the CPM.
  • Compared to the December 17, 1991 promulgated Method 202, this method removes water from the impingers (dry at start of sampling) and includes the addition of a condenser followed by a water dropout impinger immediately after the final in-stack or heated filter.
    • This method also includes the addition of one modified Greenburg Smith impinger and a CPM filter following the water dropout impinger.
  • Do not use silicone grease - it will be soluble in the final train rinse and can bias the organic CPM value high.
  • Run the train isokinetically or pseudo-isokinetically if combined with M201, M201A or OTM 27.
  • CPM is collected in the water dropout impinger, the modified Greenburg Smith impinger, and the CPM filter of the sampling train as described in this method.
    • The impinger contents are purged with nitrogen (N2) immediately after sample collection to remove dissolved sulfur dioxide (SO2) gases from the impinger.
    • The CPM filter is extracted with water and hexane. The impinger solution is then extracted with hexane.
    • The organic and aqueous fractions are dried and the residues are weighed. The total of the aqueous and organic fractions represents the CPM.
  • IMPORTANT - hexane is an extremely flammable solvent! It should only be worked with under a hood!
  • IMPORTANT - Many resin type DI systems do not produce water of a grade that meets the 0.001% criteria for blanks.
    • Blank-test your water before testing.
    • If purchasing H2O, DI/UF grade is recommended.
  • The water is evaporated in a temperature-controlled oven at 105°C.
  • The hexane is evaporated under a hood at ambient temperatures.
  • If water has a pH of ‹7.0, acidic components are 'neutralized' in order to allow acquisition of constant weights.
  • This method may be used to measure emissions following a wet scrubber only when combined with a filterable particulate method that operates at high enough temperatures to cause water droplets sampled through the probe to become gaseous.

Shipping

  • Both Acetone and hexane must be shipped as hazardous materials. Please call for IATA codes if you need them.
  • Samples may be shipped at ambient temperatures.
  • It may prove more economical to keep acetone and hexane rinses separate, ship other samples normally, and the solvent rinses as hazardous.
  • Be sure to include a chain of custody for each shipping container.

Applications

  • THE method for measurement of condensable particulate matter (CPM).
  • Catches can be examined to determine the nature of the CPM.
  • Ammonia Slip, often prevalent for SNCRs, can be problematic causing excessive CPM;
  • Coal additives to aid in mercury collection (e.g. CaBr2) can affect the CPM.
    • Clean Air has examined various catches using ion chromatography to determine the effects of adding bromide to the coal.

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