This test method can be a useful diagnostic tool in measuring the impurities and detecting their sources in high purity water, the steam condensate of high pressure power plants, and in the process water of certain industries requiring water of the highest purity attainable.

The measurement of such impurities is most important to these industries since plant outages or product contamination can result from events such as condenser leakage. Also, water quality deviations can occur from condensate polishing and makeup water equipment malfunctions.

The continuous measurement and trends provided by this test method are of particular interest and can indicate the need for corrections in water treating or operating procedures and equipment. The equipment for this test method can be considered more rugged and adaptable to installation under plant operating conditions than the more accurate laboratory methods, such as ion chromatography and atomic absorption.

1. Scope

1.1 This on-line test method includes hydrogen exchange and degassing by boiling and provides means for determining anions (such as Cl ⁻, SO₄⁻⁻, NO ₃⁻, and F ⁻) at levels as low as 2 μg/L (2 ppb) and carbon dioxide at the level of 0.01 to 10 mg/L (ppm) at 25°C in high purity water and steam condensate by measuring electrical conductivity.

1.2 The conductivity of all anions (except OH ⁻) is determined and not the conductivity of an individual anion if more than one is present. If only one anion is present (such as Cl ⁻ or SO₄ ⁻⁻), reference to Table 1 and Table 2 or Figs. 1-3 provides the chloride or sulfate and CO₂ concentration.

1.3 This test method has been improved in accuracy by using a modern microprocessor instrument for conductivity and temperature measurement and appropriate temperature compensation algorithms for compensation to 25°C.

1.4 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.

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.

2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

ASTM Standards

D1066 Practice for Sampling Steam

D1125 Test Methods for Electrical Conductivity and Resistivity of Water

D1129 Terminology Relating to Water

D1192 Guide for Equipment for Sampling Water and Steam in Closed Conduits

D1193 Specification for Reagent Water

D2777 Practice for Determination of Precision and Bias of Applicable Test Methods of Committee D19 on Water

D3370 Practices for Sampling Water from Closed Conduits

Keywords

anion electrical conductivity; carbon dioxide; cation conductivity; degassed cation conductivity; electrical conductivity; high purity water; reboiled conductivity; Water quality monitoring; Anion electrical conductivity; Automated procedures--water analysis; Carbon dioxide content; Cation conductivity; Conductance and conductivity (electrical)--water; De-gassed cation conductivity; High-pressure power plants; High-purity water; Hydrogen ion exchange; Impurities--water; Microelectronic device processing--water; Reagent water; Reboiled conductivity; Steam

ICS Code

ICS Number Code 17.220.20 (Measurement of electrical and magnetic quantities)

Citing ASTM Standards

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