ASTM D5128-14(2022) PDF

Scope: 1.1 This 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. 1.2 This 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. 1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 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.

ASTM D5128-14(2022) Referenced Document

ASTM D1129 Standard Terminology Relating to Water
ASTM D1193 Standard Specification for Reagent Water
ASTM D1293 Standard Test Methods for pH of Water
ASTM D2777 Standard Practice for Determination of Precision and Bias of Applicable Methods of Committee D-19 on Water
ASTM D3864 Standard Guide for Continual On-Line Monitoring Systems for Water Analysis
ASTM D4453 Standard Practice for Handling of Ultra-Pure Water Samples
ASTM D5464 Standard Test Methods for pH Measurement of Water of Low Conductivity

2022 ASTM D5128-14(2022) Standard Test Method for On-Line pH Measurement of Water of Low Conductivity
2014 ASTM D5128-14 Standard Test Method for On-Line pH Measurement of Water of Low Conductivity
2009 ASTM D5128-09 Standard Test Method for On-Line pH Measurement of Water of Low Conductivity
1990 ASTM D5128-90(2005) Standard Test Method for On-Line pH Measurement of Water of Low Conductivity
1999 ASTM D5128-90(1999)e1 Standard Test Method for On-Line pH Measurement of Water of Low Conductivity