Transcription of Standard Operating Procedure: Sample Preparation and ...
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Standard Operating Procedure: Sample Preparation and ...
RSKSOP-175 Revision 2004 Page 1 of 14 Felisa Hudson Standard Operating PROCEDURES ample Preparation and Calculations for Dissolved Gas Analysisin Water Samples Using a GC Headspace Equilibration :This Standard Operating procedure has been prepared for the use of the Ground Water andEcosystems Restoration Division of the Environmental Protection Agency and may not bespecifically applicable to the activities of other organizations. THIS IS NOT AN OFFICIALEPA APPROVED METHOD. This document has not been through the Agency s peer reviewprocess or ORD clearance Purpose (Scope and Application):This method is applicable to the Preparation of water samples for determination of dissolvedgases.
, can be found by multiplying the gas volumetric concentration, C g, by the atmospheric pressure. Note: In these calculations, total pressure, p T is assumed to be equal to 1 atmosphere; therefore, p g can be expressed with units of atm. p g = C g * p T Eqn. 1 3) According to Henry’s law, at equilibrium the mole fraction of the dissolved gas, x g
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