ASTM D1125-95(2005)

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.
4.1.1 Their concentration may range from trace levels in pure waters (1)4 to significant levels in condensed steam (see Test Methods D 2186 and D 4519, and Ref (2)), or pure salt solutions.
4.1.2 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:RangeSectionsTest Method A-Field and Routine Laboratory10 to 200 000 12 to 18Measurement of Static (Non-Flowing) Samplesμ S/cmTest Method B-Continuous In-Line Measure 5 to 200 00019 to 23mentμ 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.
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.
1.4 This test method is applicable to field and routine laboratory measurements of the electrical conductivity of water using static samples.
1.5 This test method is applicable to the continuous, in-line measurement of the electrical conductivity of water.

General Information

• Status: Historical
• Publication Date: 31-Mar-2005
• 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

Relations

• Replaces: ASTM D1125-95(1999) - Standard Test Methods for Electrical Conductivity and Resistivity of Water
• Effective Date: 01-Apr-2005
• Referred By: ASTM D7100-11(2020) - Standard Test Method for Hydraulic Conductivity Compatibility Testing of Soils with Aqueous Solutions
• Effective Date: 01-Apr-2005
• Referred By: ASTM D7513-17 - Standard Test Method for Capacity of Mixed Bed Ion Exchange Cartridges
• Effective Date: 01-Apr-2005
• Referred By: ASTM D4519-16 - Standard Test Method for On-Line Determination of Anions and Carbon Dioxide in High Purity Water by Cation Exchange and Degassed Cation Conductivity
• Effective Date: 01-Apr-2005
• Referred By: ASTM D5615-21 - Standard Practice for Operating Characteristics of Home Reverse Osmosis Devices
• Effective Date: 01-Apr-2005
• Referred By: ASTM D3087-17 - Standard Test Method for Operating Performance of Anion-Exchange Materials for Strong Acid Removal
• Effective Date: 01-Apr-2005
• Referred By: ASTM D4266-17 - Standard Test Methods for Precoat Capacity of Powdered Ion-Exchange Resins
• Effective Date: 01-Apr-2005
• Referred By: ASTM D7283-17 - Standard Test Method for Alpha and Beta Activity in Water By Liquid Scintillation Counting
• Effective Date: 01-Apr-2005
• Referred By: ASTM D8485-23 - Standard Test Method for Corrosion Test for Electric Vehicle Coolants in Glassware
• Effective Date: 01-Apr-2005
• Referred By: ASTM B679-98(2021) - Standard Specification for Electrodeposited Coatings of Palladium for Engineering Use
• Effective Date: 01-Apr-2005
• Referred By: ASTM C1663-18 - Standard Test Method for Measuring Waste Glass or Glass Ceramic Durability by Vapor Hydration Test
• Effective Date: 01-Apr-2005
• Referred By: ASTM D6807-17 - Standard Test Method for Operating Performance of Continuous Electrodeionization Systems on Reverse Osmosis Permeates from<brk/>2 to 100 &#x3bc;S/cm
• Effective Date: 01-Apr-2005
• Referred By: ASTM E1943-98(2015) - Standard Guide for Remediation of Ground Water by Natural Attenuation at Petroleum Release Sites
• Effective Date: 01-Apr-2005
• Referred By: ASTM B488-18 - Standard Specification for Electrodeposited Coatings of Gold for Engineering Uses
• Effective Date: 01-Apr-2005
• Referred By: ASTM C225-85(2022) - Standard Test Methods for Resistance of Glass Containers to Chemical Attack
• Effective Date: 01-Apr-2005

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:D 1125–95 (Reapproved 2005)
Standard Test Methods for
1
Electrical Conductivity and Resistivity of Water
This standard is issued under the fixed designation D 1125; 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 (e) 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 D4519 Test Method for On-Line Determination of Anions
and Carbon Dioxide in High Purity Water by Cation
1.1 These test methods cover the determination of the
Exchange and Degassed Cation Conductivity
electrical conductivity and resistivity of water. The following
D5391 Test Method for Electrical Conductivity and Resis-
test methods are included:
tivity of a Flowing High Purity Water Sample
Range Sections
E1 Specification forASTM Liquid-in-GlassThermometers
Test Method A—Field and Routine Laboratory 10 to 200 000 12 to 18
Measurement of Static (Non-Flowing) µS/cm
Samples
3. Terminology
Test Method B—Continuous In-Line Measure 5 to 200 000 19 to 23
3.1 Definitions:
ment µ S/cm
3.1.1 electrical conductivity—the reciprocal of the a-c re-
1.2 These test methods have been tested in reagent water. It
sistance in ohms measured between opposite faces of a
is the user’s responsibility to ensure the validity of these test
centimetre cube of an aqueous solution at a specified tempera-
methods for waters of untested matrices.
ture.
1.3 For measurements below the range of these test meth-
ods, refer to Test Method D5391. NOTE 1—The unit of electrical conductivity is siemens per centimetre.
(The previously used units of mhos/cm are numerically equivalent to
1.4 This standard does not purport to address all of the
S/cm.) The actual resistance of the cell, R , is measured in ohms. The
x
safety concerns, if any, associated with its use. It is the
conductance, 1/R , is directly proportional to the cross-sectional area, A
x
responsibility of the user of this standard to establish appro-
2
(in cm ), and inversely proportional to the length of the path, L (in cm):
priate safety and health practices and determine the applica-
1/R 5 K·A/L
x
bility of regulatory limitations prior to use.
The conductance measured between opposite faces of a
2. Referenced Documents
centimetre cube, K, is called conductivity. Conductivity values
2
are usually expressed in microsiemens/centimetre or in
2.1 ASTM Standards:
D1066 Practice for Sampling Steam siemens/centimetre at a specified temperature, normally 25°C.
D1129 Terminology Relating to Water 3.1.2 electrical resistivity—the a-c resistance in ohms mea-
D1192 Specification for Equipment for Sampling Water sured between opposite faces of a centimetre cube of an
3
and Steam in Closed Conduits aqueous solution at a specified temperature.
D1193 Specification for Reagent Water
NOTE 2—Theunitofelectricalresistivityisohm-centimetre.Theactual
D2186 Test Method for Deposit-Forming Impurities in
resistanceofthecell, R ,ismeasuredinohms,andisdirectlyproportional
x
Steam
to the length of the path, L (in cm), and inversely proportional to the
2
D2777 Practice for Determination of Precision and Bias of
cross-sectional area, A (in cm ):
Applicable Methods of Committee D19 on Water
R 5 R·L/A
x
D3370 PracticesforSamplingWaterfromClosedConduits
The resistance measured between opposite faces of a centi-
metre cube, R, is called resistivity. Resistivity values are
usually expressed in ohm·centimetre, or in megohm · centime-
1
These test methods are under the jurisdiction of Committee D19 on Water and tre, at a specified temperature, normally 25°C.
are the direct responsibility of Subcommittee D19.03 on Sampling of Water and
3.1.3 For definitions of other terms used in these methods,
Water-Formed Deposits, Surveillance of Water, and Flow Measurement of Water.
refer to Terminology D1129.
Current edition approved April 1, 2005. Published April 2005. Originally
3.2 Symbols:Symbols:
approved in 1950. Last previous edition approved in 1999 as D1125–95 (1999).
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
3.2.1 Symbols used in the equations in Sections 14 and 16
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
are defined as follows:
Standards volume information, refer to the standard’s Document Summary page on
−1
J =cell constant, cm ,
the ASTM website.
3
Withdrawn. K =conductivity at 25°C, µS/cm,
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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D 1125–95 (2005)
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TABLE 1 Electrical Conductivity Values Assigned to the Potassium Chlorid
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