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ASTM D1125-95(2009)

(Test Method)

Standard Test Methods for Electrical Conductivity and Resistivity of Water

Standard Test Methods for Electrical Conductivity and Resistivity of Water

SIGNIFICANCE AND USE
These test methods are applicable for such purposes as impurity detection and, in some cases, the quantitative measurement of ionic constituents dissolved in waters. These include dissolved electrolytes in natural and treated waters, such as boiler water, boiler feedwater, cooling water, and saline and brackish water.
Their concentration may range from trace levels in pure waters (1) to significant levels in condensed steam (see Test Methods D 2186 and D 4519, and Ref (2)), or pure salt solutions.
Where the principal interest in the use of conductivity methods is to determine steam purity, see Ref (3). These test methods may also be used for checking the correctness of water analyses (4).
SCOPE
1.1 These test methods cover the determination of the electrical conductivity and resistivity of water. The following test methods are included:
RangeSections Test Method A—Field and Routine Laboratory 10 to 200 000 12 to 18  Measurement of Static (Non-Flowing) Samples μS/cm Test Method B—Continuous In-Line Measure 5 to 200 00019 to 23  ment μ S/cm
1.2 These test methods have been tested in reagent water. It is the user's responsibility to ensure the validity of these test methods for waters of untested matrices.
1.3 For measurements below the range of these test methods, refer to Test Method D 5391.
1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this 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.  
12.1 This test method is applicable to field and routine laboratory measurements of the electrical conductivity of water using static samples.  
19.1 This test method is applicable to the continuous, in-line measurement of the electrical conductivity of water.

General Information

Status
Historical
Publication Date
30-Apr-2009
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

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ASTM D1125-95(2009) - Standard Test Methods for Electrical Conductivity and Resistivity of Water
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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: D1125 − 95(Reapproved 2009)
Standard Test Methods for
1
Electrical Conductivity and Resistivity of Water
This standard is issued under the fixed designation D1125; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope D1193Specification for Reagent Water
D2186Test Methods for Deposit-Forming Impurities in
1.1 These test methods cover the determination of the
Steam
electrical conductivity and resistivity of water. The following
D2777Practice for Determination of Precision and Bias of
test methods are included:
Applicable Test Methods of Committee D19 on Water
Range Sections
D3370Practices for Sampling Water from Closed Conduits
Test Method A—Field and Routine Laboratory 10 to 200 000 12 to 18
Measurement of Static (Non-Flowing) µS/cm D4519Test Method for On-Line Determination of Anions
Samples
and Carbon Dioxide in High Purity Water by Cation
Test Method B—Continuous In-Line Measure 5 to 200 000 19 to 23
Exchange and Degassed Cation Conductivity
ment µ S/cm
D5391Test Method for Electrical Conductivity and Resis-
1.2 These test methods have been tested in reagent water. It
tivity of a Flowing High Purity Water Sample
is the user’s responsibility to ensure the validity of these test
E1Specification for ASTM Liquid-in-Glass Thermometers
methods for waters of untested matrices.
1.3 For measurements below the range of these test
3. Terminology
methods, refer to Test Method D5391.
3.1 Definitions:
1.4 The values stated in SI units are to be regarded as
3.1.1 electrical conductivity—thereciprocalofthea-cresis-
standard. No other units of measurement are included in this
tanceinohmsmeasuredbetweenoppositefacesofacentimetre
standard.
cube of an aqueous solution at a specified temperature.
1.5 This standard does not purport to address all of the
NOTE 1—The unit of electrical conductivity is siemens per centimetre.
safety concerns, if any, associated with its use. It is the
(The previously used units of mhos/cm are numerically equivalent to
responsibility of the user of this standard to establish appro- S/cm.) The actual resistance of the cell, R , is measured in ohms. The
x
conductance, 1/R , is directly proportional to the cross-sectional area, A
priate safety and health practices and determine the applica- x
2
(in cm ), and inversely proportional to the length of the path, L (in cm):
bility of regulatory limitations prior to use.
1/R 5 K·A/L
x
2. Referenced Documents
The conductance measured between opposite faces of a
2
2.1 ASTM Standards:
centimetre cube, K, is called conductivity. Conductivity val-
D1066Practice for Sampling Steam
ues are usually expressed in microsiemens/centimetre or in
D1129Terminology Relating to Water
siemens/centimetre at a specified temperature, normally
D1192Guide for Equipment for Sampling Water and Steam
25°C.
3
in Closed Conduits (Withdrawn 2003)
3.1.2 electrical resistivity—the a-c resistance in ohms mea-
sured between opposite faces of a centimetre cube of an
aqueous solution at a specified temperature.
1
These test methods are under the jurisdiction of Committee D19 on Water and
are the direct responsibility of Subcommittee D19.03 on Sampling Water and
NOTE2—Theunitofelectricalresistivityisohm-centimetre.Theactual
Water-Formed Deposits,Analysis of Water for Power Generation and Process Use,
resistanceofthecell, R ,ismeasuredinohms,andisdirectlyproportional
x
On-Line Water Analysis, and Surveillance of Water.
to the length of the path, L (in cm), and inversely proportional to the
Current edition approved May 1, 2009. Published June 2009. Originally
2
cross-sectional area, A (in cm ):
approved in 1950. Last previous edition approved in 2005 as D1125–95 (2005).
DOI: 10.1520/D1125-95R09.
R 5 R·L/A
x
2
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
The resistance measured between opposite faces of a cen-
Standards volume information, refer to the standard’s Document Summary page on
timetre cube, R, is called resistivity. Resistivity values are
the ASTM website.
3
usually expressed in ohm·centimetre, or in megohm ·
The last approved version of this historical standard is referenced on
www.astm.org. centimetre, at a specified temperature, normally 25°C.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
D1125 − 95 (2009)
A
TABLE 1 Electrical Conductivity Values Assigned to
...

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