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Significance and Use
4.1 pH is, within the limits described in , an accurate measurement of the hydrogen ion concentration and thus is widely used for the characterization of aqueous solutions.
4.2 pH measurement is one of the main process control variables in the chemical industry and has a prominent place in pollution control.
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 mol/L (M).
1.2 The values stated in SI units are to be regarded as standard. The values in parentheses are for information only.
1.3 In determining the conformance of the test results using this method to applicable specifications, results shall be rounded off in accordance with the rounding-off method of Practice .
1.4 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
D1193 Specification for Reagent Water
D1293 Test Methods for pH of Water
D5128 Test Method for On-Line pH Measurement of Water of Low Conductivity
D5464 Test Method for pH Measurement of Water of Low Conductivity
D6569 Test Method for On-Line Measurement of pH
D6809 Guide for Quality Control and Quality Assurance Procedures for Aromatic Hydrocarbons and Related Materials
E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
E180 Practice for Determining the Precision of ASTM Methods for Analysis and Testing of Industrial and Specialty Chemicals
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
E1910/E1910M Test Method for Agricultural pH Control Agents, Measurement of pH Change and Buffering Capacity
ICS Number Code 71.040.50 (Physicochemical methods of analysis)
|Link to Active (This link will always route to the current Active version of the standard.)|
ASTM E70-19, Standard Test Method for pH of Aqueous Solutions With the Glass Electrode, ASTM International, West Conshohocken, PA, 2019, www.astm.orgBack to Top