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ASTM D5015-02

Historical Revision

Standard Test Method for pH of Atmospheric Wet Deposition Samples by Electrometric Determination

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1.1 This test method is applicable to the determination of pH in atmospheric wet deposition samples by electrometric measurement using either a pH half cell with a reference probe or a combination electrode as the sensor.

1.2 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.


The accurate measurement of pH in atmospheric wet deposition is an essential and critically important component in the monitoring of atmospheric wet deposition for trends in the acidity and overall air quality. Atmospheric wet deposition is, in general, a low ionic strength, unbuffered solution. Special precautions, as detailed in this test method, are necessary to ensure accurate pH measurements (1).3 Special emphasis must be placed on minimizing the effect of the residual liquid junction potential bias.

This test method is applicable only to the measurement of pH in atmospheric wet deposition. Its use in other applications may result in inaccuracies.

Fig. 1 provides a frequency distribution of precipitation pH values measured in conjunction with a national monitoring program within the United States. These data are an indication of the range of pH values common to atmospheric wet deposition.


FIG. 1 Frequency Distribution of Measured Laboratory pH of Atmospheric Wet Deposition From the 1984 National Atmospheric Deposition Program (NADP)/National Trends Network (NTN)

SDO ASTM: ASTM International
Document Number D5015
Publication Date Oct. 10, 2002
Language en - English
Page Count 6
Revision Level 02
Supercedes
Committee D22.03
Publish Date Document Id Type View
April 1, 2015 D5015-15 Revision
Oct. 10, 2002 D5015-02 Revision
Jan. 1, 1995 D5015-95 Revision
March 1, 2022 D5015-15R22 Reaffirmation
Aug. 1, 2008 D5015-02R08 Reaffirmation