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Standard Test Method for pH of Aqueous Solutions With the Glass Electrode
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Scope
1.1 This test method specifies the apparatus and procedures for the electrometric measurement of pH values of aqueous solutions with the glass electrode. It does not deal with the manner in which the solutions are prepared. pH measurements of good precision can be made in aqueous solutions containing high concentrations of electrolytes or water-soluble organic compounds, or both. It should be understood, however, that pH measurements in such solutions are only a semiquantitative indication of hydrogen ion concentration or activity. The measured pH will yield an accurate result for these quantities only when the composition of the medium matches approximately that of the standard reference solutions. In general, this test method will not give an accurate measure of hydrogen ion activity unless the pH lies between 2 and 12 and the concentration of neither electrolytes nor nonelectrolytes exceeds 0.1 M
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.
Keywords
aqueous solution; buffer; combination electrode; glass electrode; pH; pH meter; reference electrode; ICS Number Code 71.040.50 (Physicochemical methods of analysis)
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Document Number
ASTM-E70-97(2002)
Revision Level
1997 R02 EDITION
Status
Superseded
Modification Type
Reapproval
Publication Date
Dec. 1, 2002
Document Type
Test Method
Page Count
6 pages
Committee Number
E15.01