ASTM D2791-13
Standard Test Method for On-line Determination of Sodium in Water

Standard No.

ASTM D2791-13

Release Date

2013

Published By

American Society for Testing and Materials (ASTM)

Status

Be replaced

Replace By

ASTM D2791-19

Latest

ASTM D2791-19

Scope

4.1 Sodium is a pervasive contaminant and it is the first cation to break through deionization equipment. This test method allows measurement of micrograms per litre (parts per billion) concentrations of sodium in water to monitor low-sodium water sources for indications of contamination or proper operation. Applications include monitoring makeup systems, condensers, condensate polishers, feedwater, boilerwater, and steam.

4.2 This test method is more sensitive and selective than conductivity measurements on high purity samples.

1.1 This test method covers the on-line determination of trace amounts of sodium in water using an ion-selective electrode.

1.2 This test method is based on on-line application of the sodium ion electrode as reported in the technical literature (1-3).² It is generally applicable over the range of 0.01 to 108201;000 μg/L.

1.3 The analyst should be aware that adequate collaborative data for precision and bias statements as required by Practice D2777 are not provided. See Section 16 for details.

1.4 The values stated in SI units are to be regarded as standard. The inch-pound units given in parentheses are for information only.

1.5 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. For specific hazard statements see Section 6.

ASTM D2791-13 Referenced Document

• ASTM D1066 Standard Practice for Sampling Steam
• 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 D3370 Standard Practices for Sampling Water from Closed Conduits
• ASTM D3864 Standard Guide for Continual On-Line Monitoring Systems for Water Analysis
• ASTM D5540 Standard Practice for Flow Control and Temperature Control for On-Line Water Sampling and Analysis

ASTM D2791-13 history

• 2019 ASTM D2791-19 Standard Test Method for On-Line Determination of Sodium in Water
• 2013 ASTM D2791-13 Standard Test Method for On-line Determination of Sodium in Water
• 2007 ASTM D2791-07 Standard Test Method for On-line Determination of Sodium in Water
• 1993 ASTM D2791-93(2001) Standard Test Methods for Continuous Determination of Sodium in Water