ASTM D511-93(1998)

Standard Test Methods for Calcium and Magnesium In Water

SCOPE
1.1 These test methods cover the determination of calcium and magnesium in water by complexometric titration and atomic absorption spectrophotometric procedures. Two test methods are included, as follows:  Sections Test Method A -- Complexometric Titration 7 to 14 Test Method B -- Atomic Absorption Spectrophotometric 15 to 23
1.2 This standard does not purport to address all of the safety problems, 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. >Specific hazard statements are given in Notes 2 and 7.

General Information

• Status: Historical
• Publication Date: 09-Apr-1998
• ICS: 13.060.50 - Examination of water for chemical substances
• Technical Committee: D19 - Water
• Drafting Committee: D19.05 - Inorganic Constituents in Water

Relations

• Replaced By: ASTM D511-03 - Standard Test Methods for Calcium and Magnesium In Water
• Effective Date: 10-Jun-2003

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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 511 – 93 (Reapproved 1998)
AMERICAN SOCIETY FOR TESTING AND MATERIALS
100 Barr Harbor Dr., West Conshohocken, PA 19428
Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
Standard Test Methods for
1
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 5. Purity of Reagents
1.1 These test methods cover the determination of calcium 5.1 Reagent grade chemicals shall be used in all tests.
and magnesium in water by complexometric titration and Unless otherwise indicated, it is intended that all reagents shall
atomic absorption spectrophotometric procedures. Two test conform to the specifications of the Committee on Analytical
3
methods are included, as follows: Reagents of the American Chemical Society. Other grades
may be used, provided it is first ascertained that the reagent is
Sections
Test Method A—Complexometric Titration 7 to 14
of sufficiently high purity to permit its use without lessening
Test Method B—Atomic Absorption Spectrophotometric 15 to 23
the accuracy of the determination.
1.2 This standard does not purport to address all of the
5.2 Purity of Water—Unless otherwise indicated, references
safety concerns, if any, associated with its use. It is the to water shall be understood to mean reagent water conforming
responsibility of the user of this standard to establish appro-
to Specification D 1193, Type 1, II, or III water. Type I is
priate safety and health practices and determine the applica- preferred and more commonly used. Type II water was
bility of regulatory limitations prior to use. Specific hazard
specified at the time of round-robin testing of these test
statements are given in Note 2 and Note 7. methods.
NOTE 1—The user must ensure the type of reagent water is sufficiently
2. Referenced Documents
free of interferences. The water should be analyzed using this test method.
2.1 ASTM Standards:
2
D 1129 Terminology Relating to Water
6. Sampling
2
D 1193 Specification for Reagent Water
6.1 Collect the sample in accordance with Practices D 3370.
D 2777 Practice for Determination of Precision and Bias of
6.2 If total recoverable calcium and magnesium concentra-
2
Applicable Methods of Committee D-19 on Water
tions are being determined, acidify the water sample with
D 3370 Practices for Sampling Water from Closed Con-
HNO (sp gr 1.42) to a pH of 2 or less immediately at the time
3
2
duits
of collection; normally about 2 mL/L are required. The holding
D 4691 Practice for Measuring Elements in Water by Flame
time for the samples may be calculated in accordance with
2
Atomic Absorption Spectrophotometry
Practice D 4841.
D 4841 Practice for Estimation of Holding Times for Water
6.3 If dissolved calcium and magnesium concentrations are
2
Samples Containing Organic and Inorganic Constituents
being determined, filter the samples through a 0.45-μm mem-
brane filter and acidify with HNO (sp gr 1.42) to a pH of 2 or
3
3. Terminology
less immediately at time of collection; normally about 2 mL/L
3.1 Definitions—For definitions of terms used in these test
are required.
methods, refer to Terminology D 1129.
6.4 A number of sources of calcium contamination have
been encountered in laboratories. Among the most common are
4. Significance and Use
plastic ware, paper towels, and dust. Rinsing plastic ware with
4.1 Calcium and magnesium salts in water are the primary
sample prior to use, avoiding contact of apparatus with paper
components of water hardness which can cause pipe or tube
towels, and keeping exposure to the air to a minimum will limit
scaling.
the possibility of contamination.
3
1
Reagent Chemicals, American Chemical Society Specifications, American
These test methods are under the jurisdiction of ASTM Committee D-19 on
Water and are the direct responsibility of Subcommittee D19.05 on Inorganic Chemical Society, Washington, DC. For suggestions on the testing of reagents not
Constituents in Water. listed by the American Chemical Society, see Analar Standards for Laboratory
Current edition approved April 15, 1993. Published June 1993. Originally Chemicals, BDH Ltd., Poole, Dorset, U.K., and the United States Pharmacopeia
published as D 511 – 37. Last previous edition D 511 – 92. and National Formulary, U.S. Pharmaceutical Convention, Inc. (USPC), Rockville,
2
Annual Book of ASTM Standards, Vol 11.01. MD.
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