Compendium of Methods for the Determination of Inorganic Compounds in Ambient Air Compendium Method Io-2.4 Calculations for Standard Volume


EPA/625/R-96/010a
Compendium of Methods
for the Determination of
Inorganic Compounds
in Ambient Air
Compendium Method 10-2.4
CALCULATIONS
FOR
STANDARD VOLUME
Center for Environmental Research Information
Office of Research and Development
U.S. Environmental Protection Agency
Cincinnati, OH 45268
June 1999

-------
Method 10-2.4
Acknowledgments
This Method is a part of Compendium of Methods for the Determination of Inorganic Compounds in
Ambient Air (EPA/625/R-96/010a), which was prepared under Contract No. 68-C3-0315, WA No. 2-10,
by Midwest Research Institute (MRI), as a subcontractor to Eastern Research Group, Inc. (ERG), and
under the sponsorship of the U.S. Environmental Protection Agency (EPA). Justice A. Manning,
John 0. Burckle, Scott Hedges, Center for Environmental Research Information (CERI), and Frank F.
McElroy, National Exposure Research Laboratory (NERL), all in the EPA's Office of Research and
Development, were responsible for overseeing the preparation of this method. Other support was
provided by the following members of the Compendia Workgroup:
•	James L. Cheney, U.S. Army Corps of Engineers, Omaha, NE
•	Michael F. Davis, U.S. EPA, Region 7, KC, KS
•	Joseph B. Elkins Jr., U.S. EPA, OAQPS, RTP, NC
•	Robert G. Lewis, U.S. EPA, NERL, RTP, NC
•	Justice A. Manning, U.S. EPA, ORD, Cincinnati, OH
•	William A. McClenny, U.S. EPA, NERL, RTP, NC
•	Frank F. McElroy, U.S. EPA, NERL, RTP, NC
•	William T. "Jerry" Winberry, Jr., EnviroTech Solutions, Cary, NC
This Method is the result of the efforts of many individuals. Gratitude goes to each person involved in
the preparation and review of this methodology.
Author (s)
•	William T. "Jerry" Winberry, Jr., EnviroTech Solutions, Cary, NC
Peer Reviewers
•	David Brant, National Research Center for Coal and Energy, Morgantown, WV
•	John Glass, SC Department of Health and Environmental Control, Columbia, SC
•	Jim Cheney, U.S. Army Corps of Engineers, Omaha, NE
•	Lauren Drees, U.S. EPA, NRMRL, Cincinnati, OH
DISCLAIMER
This Compendium has been subjected to the Agency's peer and administrative review, and it has
been approved for publication as an EPA document. Mention of trade names or commercial
products does not constitute endorsement or recommendation for use.
ii

-------
Method 10-2.4
Calculating Standard Volume
TABLE OF CONTENTS
Page
1.	Introduction	 2.4-1
2.	Calculation of Volume to STP	 2.4-1
3.	Federal Register Citation 	 2.4-1
iii

-------
[This page intentionally left blank.]
iv

-------
Chapter 10-2
INTEGRATED SAMPLING OF SPM IN AMBIENT AIR
Method 10-2.4
CALCULATING STANDARD VOLUME
1. Introduction
1.1	Most atmospheric sampling techniques use a sampling train whereby air containing the pollutant of
interest enters the train and passes through a sample collection device.
1.2	The weight of the pollutant collected is compared to the volume of air drawn through the train to
extrapolate the concentration of the pollutant in the ambient air. The concentration is usually expressed in
terms of pg/m3, corrected to EPA's standard temperature and pressure (STP).
where:
2.	Calculation of Volume to STP
2.1	To compare gas sampling data collected by various agencies and organizations from around the country,
EPA has specified that all gas volumes must be corrected to a set of predetermined standard conditions. For
atmospheric or ambient sampling, these conditions are 25°C or 298K and 760 mm Hg.
2.2	The equation used to correct sample volumes (Vs) to EPA standard volume (Vstd) conditions is:
Vstd =	(Vs)(Patm/Pstd)(Tstd/Tatm)
vstd =	(Vs) (Patm/760 mm Hg) (298 K/Tatm)
Vstd =	(Vs) (0.3 9) (Patm/Tatm)
Vstd =	volume of gas sampled, corrected to EPA's standard pressure (760 mm Hg) and standard
temperature (25 °C), m3.
Vs =	volume of gas sampled at atmospheric pressure (Patm) and temperature (Tatm), m3.
Tstd =	EPA standard temperature (25°C), 273 + 25 = 298 K.
Pstd =	EPA standard pressure, 760 mmHg.
Tatm =	average atmospheric temperature during sampling (°C), 273 + 25 = 298K.
Patm =	average atmospheric pressure during sampling, mmHg.
0.39 =	298 K/760 mm Hg.
3.	Federal Register Citation
3.1	The full text of EPA's specifications for correcting volumes to STP can be found in 40 CFR, Part 50,
Appendix B.
3.2	All sample volumes must be corrected to STP.
June 1999
Compendium of Methods for Inorganic Air Pollutants
Page 2.4-1

-------
Method 10-2.4 Chapter 10-2
Standard Volume	High Volume
[This page intentionally left blank.]
Page 2.4-2
Compendium of Methods for Inorganic Air Pollutants
January 1999

-------