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ASTM D6504-07

(Practice)

Standard Practice for On-Line Determination of Cation Conductivity in High Purity Water

Standard Practice for On-Line Determination of Cation Conductivity in High Purity Water

SIGNIFICANCE AND USE
Cation conductivity provides one of the most sensitive and dependable on-line means of detecting anionic contamination in the boiler/steam cycle, such as chlorides, sulfates, nitrates, bicarbonates, and organic acids, such as formic and acetic.
High sensitivity is provided by intentionally eliminating the pH adjusting treatment chemical(s), for example, ammonia and amines, from the sample and converting remaining salt contaminants into their acid forms which are approximately three times as conductive.
Guidelines on cation conductivity limits for various cycle chemistry and boiler types have been established by EPRI  (2-4)  and by ASME (5,6).
The sample effluent from the cation exchange column also may be used, and in some cases is preferred, for ion chromatography or other anion measurements.
SCOPE
1.1 This practice describes continuous sample conditioning by hydrogen ion exchange and measurement by electrolytic conductivity. It is commonly known as cation conductivity measurement in the power industry although it is actually an indication of anion contamination in high purity water samples. Measurements are typically in a range less than 1 S/cm.
1.2 The actual conductivity measurements are made using Test Method D 5391.
1.3 This practice does not provide for separate determination of dissolved carbon dioxide. Refer to Test Methods D 2186 and D 4519.
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.

General Information

Status
Historical
Publication Date
14-Jun-2007
ICS
13.060.60 - Examination of physical properties of water
Technical Committee
D19 - Water
Drafting Committee
D19.03 - Sampling Water and Water-Formed Deposits, Analysis of Water for Power Generation and Process Use, On-Line Water Analysis, and Surveillance of Water
Current Stage
Ref Project

Relations

Replaces
ASTM D6504-00 - Standard Practice for On-Line Determination of Cation Conductivity in High Purity Water
Effective Date
15-Jun-2007
Replaced By
ASTM D6504-11 - Standard Practice for On-Line Determination of Cation Conductivity in High Purity Water
Effective Date
01-May-2011

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ASTM D6504-07 - Standard Practice for On-Line Determination of Cation Conductivity in High Purity WaterASTM D6504-07 - Standard Practice for On-Line Determination of Cation Conductivity in High Purity Water
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ASTM D6504-07 - Standard Practice for On-Line Determination of Cation Conductivity in High Purity Water
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Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:D6504–07
Standard Practice for
On-Line Determination of Cation Conductivity in High Purity
1
Water
This standard is issued under the fixed designation D6504; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope D3864 Guide for Continual On-Line Monitoring Systems
3
for Water Analysis
1.1 This practice describes continuous sample conditioning
D4519 Test Method for On-Line Determination of Anions
by hydrogen ion exchange and measurement by electrolytic
and Carbon Dioxide in High Purity Water by Cation
conductivity. It is commonly known as cation conductivity
Exchange and Degassed Cation Conductivity
measurement in the power industry although it is actually an
D5391 Test Method for Electrical Conductivity and Resis-
indicationofanioncontaminationinhighpuritywatersamples.
tivity of a Flowing High Purity Water Sample
Measurements are typically in a range less than 1 µS/cm.
D5540 Practice for Flow Control and Temperature Control
1.2 The actual conductivity measurements are made using
for On-Line Water Sampling and Analysis
Test Method D5391.
1.3 This practice does not provide for separate determina-
3. Terminology
tion of dissolved carbon dioxide. Refer toTest Methods D2186
3.1 Definitions—For definitions of terms used in this prac-
and D4519.
tice, refer to Test Methods D1125, Terminology D1129, and
1.4 This standard does not purport to address all of the
Practice D3864.
safety concerns, if any, associated with its use. It is the
3.2 Definitions of Terms Specific to This Standard:
responsibility of the user of this standard to establish appro-
3.2.1 cation conductivity, n—the parameter obtained by
priate safety and health practices and determine the applica-
conditioning a sample by passing it through a hydrogen form
bility of regulatory limitations prior to use.
cation ion exchange resin column and then measuring its
2. Referenced Documents electrolytic conductivity, on-line.
2
3.2.2 specific conductivity, n—direct electrolytic conductiv-
2.1 ASTM Standards:
ity measurement of a power plant sample, usually dominated
D1066 Practice for Sampling Steam
by treatment chemicals, such as ammonia or amines.
D1125 Test Methods for Electrical Conductivity and Resis-
tivity of Water
4. Summary of Practice
D1129 Terminology Relating to Water
4.1 The sample is passed continuously through a small
D1193 Specification for Reagent Water
cation exchange column in the hydrogen form, which ex-
D2186 Test Methods for Deposit-Forming Impurities in
+
changes all cations for H . In this process, pH adjusting
Steam
treatment chemicals, such as ammonia and amines are re-
D3370 Practices for Sampling Water from Closed Conduits
moved.
4.2 Measurement is made continuously on the conditioned
1
This practice is under the jurisdiction ofASTM Committee D19 on Water and
sample with a process high purity conductivity analyzer/
is the direct responsibility of Subcommittee D19.03 on Sampling Water and
transmitter.
Water-Formed Deposits, Analysis of Water for Power Generation and Process Use,
4.3 Temperature conditioning of the sample and specialized
On-Line Water Analysis, and Surveillance of Water.
Current edition approved June 15, 2007. Published June 2007. Originally
compensation of the measurement are used to minimize
approved in 1999. Last previous edition approved in 2000 as D6504 – 00. DOI:
temperature effects on the performance of the ion exchange
10.1520/D6504-07.
2 resin and the measurement.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
3
the ASTM website. Withdrawn.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

---------------------- Page: 1 ----------------------
D6504–07
4.4 Few studies have been published on the performance of 6.5 Carbondioxidemayalsobeaspiratedasacomponentof
cation conductivity measurement but one collaborative effort air, into the sample line through loose fittings in the exchange
4
provides some background (1). column,flowmeter,valves,etc.Thisisnotrepresentativeofthe
actual sampling point and produces positive errors.
5. Significance and Use
6.6 Incompletely regenerated or inadequately rinsed resin
5.1 Cation conductivity provides one of the most sensitive
will release trace ionic impurities that produce positive errors.
and dependable on-line means of detecting anionic contamina-
The use of fresh resin completely in the hydrogen form and
tion i
...

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ment  
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Sections  
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8  
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9  
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SCOPE
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