ASTM International - ASTM D4519-94(2005)
Standard Test Method for On-Line Determination of Anions and Carbon Dioxide in High Purity Water by Cation Exchange and Degassed Cation Conductivity
|Publication Date:||1 January 2005|
|ICS Code (Measurement of electrical and magnetic quantities):||17.220.20|
significance And Use:
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... View More
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.View Less
1.1 This on-line test method includes hydrogen exchange and degassing by boiling and provides means for determining anions (such as Cl , SO 4, NO 3 , and F ) at levels as low as 2 g/L (2 ppb) and carbon dioxide at the level of 0.01 to 10 mg/L (ppm) at 25C 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 and or 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 25C.
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.