ASTM D511-03

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Designation:D 511–03
Standard Test Methods for
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Calcium and Magnesium In Water
This standard is issued under the fixed designation D 511; 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 (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* 4. Significance and Use
1.1 These test methods cover the determination of calcium 4.1 Calcium and magnesium salts in water are the primary
and magnesium in water by complexometric titration and components of water hardness which can cause pipe or tube
atomic absorption spectrometric procedures. Two test methods scaling.
are included, as follows:
5. Purity of Reagents
Sections
Test Method A—Complexometric Titration 7 to 14
5.1 Reagent grade chemicals shall be used in all tests.
Test Method B—Atomic Absorption Spectrometric 15 to 23
Unless otherwise indicated, it is intended that all reagents shall
1.2 This standard does not purport to address all of the conform to the specifications of the Committee on Analytical
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safety concerns, if any, associated with its use. It is the Reagents of the American Chemical Society. Other grades
responsibility of the user of this standard to establish appro- may be used, provided it is first ascertained that the reagent is
priate safety and health practices and determine the applica- of sufficiently high purity to permit its use without lessening
bility of regulatory limitations prior to use. Specific hazard the accuracy of the determination.
statements are given in 12.2.6 and 20.6. 5.2 Purity of Water—Unless otherwise indicated, references
to water shall be understood to mean reagent water conforming
2. Referenced Documents
to Specification D 1193, Type 1, II, or III water. Type I is
2.1 ASTM Standards:
preferred and more commonly used. Type II water was
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D 1129 Terminology Relating to Water
specified at the time of round-robin testing of these test
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D 1193 Specification for Reagent Water
methods.
D 2777 Practice for Determination of Precision and Bias of
NOTE 1—The user must ensure the type of reagent water is sufficiently
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Applicable Methods of Committee D19 on Water
free of interferences.The water should be analyzed using this test method.
D 3370 Practices for Sampling Water from Closed Con-
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duits 6. Sampling
D 4691 Practice for Measuring Elements inWater by Flame
6.1 Collect the sample in accordance with Practices D 3370.
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Atomic Absorption Spectrophotometry
6.2 If total recoverable calcium and magnesium concentra-
D 4841 Practice for Estimation of Holding Times for Water
tions are being determined, acidify the water sample with
2
Samples Containing Organic and Inorganic Constituents
HNO (sp gr 1.42) to a pH of 2 or less immediately at the time
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2
D 5810 Guide for Spiking Into Aqueous Samples
of collection; normally about 2 mL/Lare required.The holding
D 5847 Practice for Writing Quality Control Specifications
time for the samples may be calculated in accordance with
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for Standard Test Methods for Water Analysis
Practice D 4841.
6.3 If dissolved calcium and magnesium concentrations are
3. Terminology
being determined, filter the samples through a 0.45-µm mem-
3.1 Definitions—For definitions of terms used in these test
brane filter and acidify with HNO (sp gr 1.42) to a pH of 2 or
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methods, refer to Terminology D 1129.
less immediately at time of collection; normally about 2 mL/L
are required.
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These test methods are under the jurisdiction of ASTM Committee D19 on
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Water and are the direct responsibility of Subcommittee D19.05 on Inorganic Reagent Chemicals, American Chemical Society Specifications, American
Constituents in Water. Chemical Society, Washington, DC. For suggestions on the testing of reagents not
Current edition approved June 10, 2003. Published July 2003. Originally listed by the American Chemical Society, see Analar Standards for Laboratory
approved in 1937. Last previous edition approved in 1998 as D 511 – 93 (1998). Chemicals, BDH Ltd., Poole, Dorset, U.K., and the United States Pharmacopeia
2
Annual Book of ASTM Standards, Vol 11.01. and National Formulary, U.S. Pharmaceutical Convention, Inc. (USPC), Rockville,
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Annual Book of ASTM Standards, Vol 11.02. MD.
*A Summary of Changes section appears at the end of this standard.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn. Please
contact ASTM International (www.astm.org) for the latest information
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