ASTM D3372-02

Standard Test Method for Molybdenum in Water

SCOPE
1.1 This test method covers the determination of dissolved and total recoverable molybdenum in most waters, wastewaters, and brines by atomic absorption spectroscopy.
1.2 This test method is applicable in the range from 1 to 25 μg/L of molybdenum. The range may be extended by dilution of the sample.
1.3 This test method has been used successfully with natural and reagent waters. It is the user's responsibility to ensure the validity of this test method for waters of untested matrices.
1.4 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. For specific precautionary statements, see Note 3 and Note 9.

General Information

• Status: Historical
• Publication Date: 09-Jan-2002
• ICS: 13.060.50 - Examination of water for chemical substances
• Technical Committee: D19 - Water
• Drafting Committee: D19.05 - Inorganic Constituents in Water

Relations

• Replaces: ASTM D3372-92(1996) - Standard Test Method for Molybdenum in Water
• Effective Date: 10-Jan-2002
• Replaced By: ASTM D3372-02(2007)e1 - Standard Test Method for Molybdenum in Water
• Effective Date: 01-Aug-2007
• Referred By: ASTM D1971-16(2021)e1 - Standard Practices for Digestion of Water Samples for Determination of Metals by Flame Atomic Absorption, Graphite Furnace Atomic Absorption, Plasma Emission Spectroscopy, or Plasma Mass Spectrometry
• Effective Date: 10-Jan-2002

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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 3372–02
Standard Test Method for
1
Molybdenum in Water
This standard is issued under the fixed designation D 3372; 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 D 5847 Practice for the Writing Quality Control Specifica-
4
2 tions for Standard Test Methods for Water Analysis
1.1 This test method covers the determination of dissolved
and total recoverable molybdenum in most waters, wastewa-
3. Terminology
ters, and brines by atomic absorption spectroscopy.
3.1 Definitions—For definitions of terms used in this test
1.2 This test method is applicable in the range from 1 to 25
method, refer to Terminology D 1129.
µg/L of molybdenum. The range may be extended by dilution
3.2 Definition of Term Specific to This Standard:
of the sample.
3.2.1 laboratory control sample—a solution with the certi-
1.3 Thistestmethodhasbeenusedsuccessfullywithnatural
fied concentration(s) of the analytes.
and reagent waters. It is the user’s responsibility to ensure the
3.2.2 total recoverable molybdenum—an arbitrary analyti-
validity of this test method for waters of untested matrices.
cal term relating to the forms of molybdenum that are
1.4 This standard does not purport to address all of the
determinable by the digestion procedure described in this test
safety concerns, if any, associated with its use. It is the
method.
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
4. Summary of Test Method
bility of regulatory limitations prior to use. For specific
4.1 Molybdenum is determined by atomic-absorption spec-
precautionary statements, see Note 3 and Note 9.
trophotometry. The element is chelated with
8-hydroxyquinoline, extracted with methyl isobutyl ketone,
2. Referenced Documents
and the extract aspirated into the nitrous oxide-acetylene flame
2.1 ASTM Standards:
3 of the spectrophotometer.
D 1129 Terminology Relating to Water
3
D 1193 Specification for Reagent Water
5. Significance and Use
D 2777 Practice for Determination of Precision and Bias of
3 5.1 Molybdenum can be found in waste that results from
Applicable Test Methods of Committee D-19 on Water
chemicalcleaningofcomponentsinwhichthemetalisalloyed.
D 3370 Practices for Sampling Water from Closed Con-
3 5.2 NPDES permits or other standards, or both, require
duits
monitoring pollutants in waste discharged onto the water shed
D 4691 Practice for Measuring Elements inWater by Flame
3 of, or into, navigable waters, and those disposed of in such a
Atomic Absorption Spectrophotometry
manner that eventual contamination of underground water
D 4841 Practice for Estimation of Holding Time for Water
3 could result.
Samples Containing Organic and Inorganic Constituents
5.3 Thistestmethodaffordsanaccurateandsensitivemeans
3
D 5810 Guide for Spiking into Aqueous Samples
of determining compliance with those permits.
6. Interferences
1
This test method is under the jurisdiction of ASTM Committee D19 on Water
and is the direct responsibility of Subcommittee D19.05 on Inorganic Constituents
6.1 Vanadium (V) and iron (III) enhance the absorption,
in Water.
while chromium (VI) and tungsten (VI) suppress it. These
Current edition approved Jan. 10, 2002. Published April 2002. Originally
interferences are eliminated by the addition of ascorbic acid.
published as D 3372 – 75. Last previous edition D 3372 – 92 (1996).
2
Chau, Y. K., and Lum-Shue-Chan, K., “Atomic Absorption Determination of
Microgram Quantities of Molybdenum in Lake Waters,” Analytica Chimica Acta,
Vol 48, 1969, p. 205.
3 4
Annual Book of ASTM Standards, Vol 11.01. Annual Book of ASTM Standards, Vol 11.02.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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D 3372–02
7. Apparatus 8.10 Molybdenum Solution, Standard (1.0 mL = 0.1 µg
Mo)—Immediately before use, dilute 10.0 mL of intermediate
7.1 Atomic-Absorption Spectrophotometer, for use at 313.3
molybdenum solution of 100 mL with water. This standard is
nm. A general guide for the use of flame atomic absorption
used to prepare working standards at the time of analysis.
applications is given in Practice D 4691.
8.11 Nitric Acid (sp gr 1.42)—Concentrated nitric acid
NOTE 1—The manufacturer’s instructions should be followed for all
(HNO ).
3
instrumental parameters.
8.12 Sodium Hydroxide Solution (100 g/L)—Dissolve 100 g
7.1.1 Molybdenum Hollow-Cathode Lamp.
of sodium hydroxide (NaOH
...