ASTM D513-11e1

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Designation: D513 − 11
StandardTest Methods for
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Total and Dissolved Carbon Dioxide in Water
This standard is issued under the fixed designation D513; 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.
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ε NOTE—This test method was changed editorially in February 2012.
1. Scope* D1129 Terminology Relating to Water
D1193 Specification for Reagent Water
1.1 These test methods cover the measurement of total or
D1293 Test Methods for pH of Water
dissolved carbon dioxide present as carbon dioxide (CO ),
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D2777 Practice for Determination of Precision and Bias of
carbonic acid, bicarbonate ion, and carbonate ion in water:
Applicable Test Methods of Committee D19 on Water
Range Sections
D3370 Practices for Sampling Water from Closed Conduits
Test Method A (Gas Sensing Electrode) 2 to 800 mg/L 8 to 15
Test Method B (CO Evolution, Coulometric 5to800 mg/L 16to24
D5847 Practice for Writing Quality Control Specifications
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Titration)
for Standard Test Methods for Water Analysis
1.2 Carbon dioxide may also be detected from carbonates
E200 Practice for Preparation, Standardization, and Storage
present in particulates in samples.
of Standard and Reagent Solutions for ChemicalAnalysis
1.3 Test Method A is applicable to various natural waters
3. Terminology
and brines.
3.1 Definitions—For definitions of terms used in these test
1.4 Test Method B is applicable to natural waters, brines,
methods, refer to Terminology D1129.
and various industrial waters as delineated in 16.4.
1.5 It is the user’s responsibility to ensure the validity of
4. Significance and Use
these test methods on waters of untested matrices.
4.1 Carbon dioxide is a major respiration product of plants
1.6 Several test methods were discontinued from this stan-
andanimalsandadecompositionproductoforganicmatterand
dard in 1988. Refer to Appendix X1 for historical information.
certain minerals.The atmosphere averages about 0.04 vol % of
1.7 The values stated in SI units are to be regarded as
CO . Surface waters generally contain less than 10 mg/L,
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standard. No other units of measurement are included in this
except at local points of abnormal organic or mineral decom-
standard.
position; however, underground water, particularly deep
1.8 This standard does not purport to address all of the
waters, may contain several hundred mg/L.
safety concerns, if any, associated with its use. It is the
4.2 When dissolved in water, CO contributes significantly
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responsibility of the user of this standard to establish appro-
to corrosion of water-handling systems. This is particularly
priate safety and health practices and determine the applica-
troublesome in steam condensate systems. Loss of CO from
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bility of regulatory limitations prior to use.
an aqueous system can disturb the carbonate equilibrium and
2. Referenced Documents result in calcite encrustation of confining surfaces. Scaling of
2 water heaters is a good example. Because of the delicate
2.1 ASTM Standards:
balance between corrosion and encrustation tendencies, much
D1066 Practice for Sampling Steam
care must be given to control of CO and related species in
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water systems. Recarbonation of municipal supplies during
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These test methods are under the jurisdiction of ASTM Committee D19 on
final stages of softening and amine neutralization of steam
Water and are the direct responsibility of Subcommittee D19.05 on Inorganic
Constituents in Water.
condensate are applied for these purposes.
Current edition approved April 1, 2011. Published April 2011. Originally
approved in 1938. Last previous edition approved in 2006 as D513 – 06. DOI:
5. Purity of Reagents
10.1520/D0513-11E01.
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
5.1 Reagent grade chemicals shall be used in all tests.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Unless otherwise indicated, it is intended that all reagents shall
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. conform to the specifications of the Committee on Analytical
*A Summary of Changes section appears at the end of this standard
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D513 − 11
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Reagents of the American Chemical Society. Other grades 8.2 Samples containing 2 to 800 mg/L total CO can be
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may be used, provided it is first ascertained that the reagent is analyzed by this test method. The concentration range may be
of sufficiently high purity t
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