Standard Test Method for On-Line pH Measurement of Water of Low Conductivity

Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

12-08-2022

Publisher

American Society for Testing and Materials

1.1This test method covers the precise on-line determination of pH in water samples of conductivity lower than 100 μS/cm (see Table 1 and Table 2) over the pH range of 3 to 11 (see Fig. 1), under field operating conditions. pH measurements of water of low conductivity are problematic for conventional pH electrodes, methods, and related measurement apparatus.

FIG. 1 Restrictions Imposed by the Conductivity pH Relationship

1.2This test method includes the procedures and equipment required for the continuous pH measurement of low conductivity water sample streams including the requirements for the control of sample stream pressure, flow rate, and temperature. For off-line pH measurements in low conductivity samples, refer to Test Method D5464.

1.3The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

1.4This 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.

1.5This 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.

Committee	D 19
DocumentType	Test Method
Pages	11
PublisherName	American Society for Testing and Materials
Status	Current
Supersedes	ASTM D 5128 : 2014

ASTM D 5464 : 2016	Standard Test Method for pH Measurement of Water of Low Conductivity
ASTM D 1293 : 2018	Standard Test Methods for pH of Water
ASTM E 2635 : 2014	Standard Practice for Water Conservation in Buildings Through In-Situ Water Reclamation
ASTM E 70 : 2019	Standard Test Method for pH of Aqueous Solutions With the Glass Electrode
ASTM D 1193 : 2006 : R2018	Standard Specification for Reagent Water
ASTM D 6569 : 2014	Standard Test Method for On-Line Measurement of pH (Withdrawn 2023)

ASTM D 1129 : 2013 : R2020	Standard Terminology Relating to Water
ASTM D 1129 : 2013 : R2020 : EDT 2	Standard Terminology Relating to Water
ASTM D 1129 : 2013 : R2020 : EDT 1	Standard Terminology Relating to Water