ASTM D2194-22

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: D2194 − 22
Standard Test Method for
1
Concentration of Formaldehyde Solutions
This standard is issued under the fixed designation D2194; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope E29 Practice for Using Significant Digits in Test Data to
Determine Conformance with Specifications
1.1 This test method covers the determination of the form-
aldehyde content of commercially available formaldehyde
3. Summary of Test Method
solutions ranging in concentration from 36 to 55 weight %.
3.1 Thespecimenisreactedwithanexcessofsodiumsulfite
1.2 For purposes of determining conformance of an ob-
solution and the resulting sodium hydroxide is titrated with
served value or a calculated value using this test method to
sulfuric acid using thymolphthalein indicator.
relevant specifications, test result(s) shall be rounded off “to
3.2 The sample should be essentially neutral; 0.1 % acidity
the nearest unit” in the last right-hand digit used in expressing
(as formic acid) is equivalent to 0.065 % formaldehyde.
the specification limit, in accordance with the rounding-off
method of Practice E29.
4. Significance and Use
1.3 The values stated in SI units are to be regarded as
4.1 This test method provides a measurement of formalde-
standard. No other units of measurement are included in this
hyde content (assay) of formaldehyde solutions. The results of
standard.
these measurements can be used for specification acceptance.
1.4 For hazard information and guidance, see the supplier’s
5. Apparatus
Material Safety Data Sheet.
5.1 Buret, calibrated, 100-mL, with a 50 or 75-mLreservoir
1.5 This standard does not purport to address all of the
on top of a lower portion calibrated in 0.1-mL divisions. A
safety concerns, if any, associated with its use. It is the
TFE-fluorocarbon resin stopcock is suitable for this purpose.
responsibility of the user of this standard to establish appro-
priate safety, health, and environmental practices and deter-
5.2 Erlenmeyer Flask, 500-mL capacity.
mine the applicability of regulatory limitations prior to use.
1
5.3 Vials, specimen, short, style, 1 to 1 ⁄2-dram (4 to 6-mL)
1.6 This international standard was developed in accor-
capacity.
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the
6. Reagents
Development of International Standards, Guides and Recom-
6.1 Purity of Reagents—Reagent grade chemicals shall be
mendations issued by the World Trade Organization Technical
used in all tests. Unless otherwise indicated, it is intended that
Barriers to Trade (TBT) Committee.
all reagents shall conform to the specifications of the Commit-
tee onAnalytical Reagents of theAmerican Chemical Society,
2. Referenced Documents
3
where such specifications are available. Other grades may be
2
2.1 ASTM Standards:
used, provided it is first ascertained that the reagent is of
D1193 Specification for Reagent Water
sufficiently high purity to permit its use without lessening the
accuracy of the determination.
6.2 Purity of Water—Unless otherwise indicated, references
1
This test method is under the jurisdiction of ASTM Committee D01 on Paint
to water shall be understood to mean reagent water conforming
and Related Coatings, Materials, andApplications and is the direct responsibility of
to Type IV of Specification D1193.
Subcommittee D01.35 on Solvents, Plasticizers, and Chemical Intermediates.
Current edition approved Jan. 1, 2022. Published January 2022. Originally
approved in 1963. Last previous edition approved in 2012 as D2194 – 02 (2012)
3
which was withdrawn January 2021 and reinstated in January 2022. DOI: 10.1520/ ACS Reagent Chemicals, Specifications and Procedures for Reagents and
D2194-22. Standard-Grade Reference Materials, American Chemical Society, Washington,
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or DC. For suggestions on the testing of reagents not listed by theAmerican Chemical
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Society, see Analar Standards for Laboratory Chemicals, BDH Ltd., Poole, Dorset,
Standards volume information, refer to the standard’s Document Summary page on U.K., and the United States Pharmacopeia and National Formulary, U.S. Pharma-
the ASTM website. copeial Convention, Inc. (USPC), Rockville, MD.
...