ASTM D2194-02(2007)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: D2194 − 02 (Reapproved 2007)
StandardTest Method for
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 Department of Defense.
1. Scope* 3.2 The sample should be essentially neutral; 0.1 % acidity
(as formic acid) is equivalent to 0.065 % formaldehyde.
1.1 This test method covers the determination of the form-
aldehyde content of commercially available formaldehyde
4. Significance and Use
solutions ranging in concentration from 36 to 55 weight %.
4.1 This test method provides a measurement of formalde-
1.2 For purposes of determining conformance of an ob-
hyde content (assay) of formaldehyde solutions. The results of
served value or a calculated value using this test method to
these measurements can be used for specification acceptance.
relevant specifications, test result(s) shall be rounded off “to
the nearest unit” in the last right-hand digit used in expressing 5. Apparatus
the specification limit, in accordance with the rounding-off
5.1 Buret, calibrated, 100-mL, with a 50 or 75-mLreservoir
method of Practice E29.
on top of a lower portion calibrated in 0.1-mL divisions. A
1.3 The values stated in SI units are to be regarded as TFE-fluorocarbon resin stopcock is suitable for this purpose.
standard. No other units of measurement are included in this
5.2 Erlenmeyer Flask, 500-mL capacity.
standard.
5.3 Vials, specimen, short, style, 1 to 1 ⁄2-dram (4 to 6-mL)
1.4 For hazard information and guidance, see the supplier’s
capacity.
Material Safety Data Sheet.
6. Reagents
1.5 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
6.1 Purity of Reagents—Reagent grade chemicals shall be
responsibility of the user of this standard to establish appro-
used in all tests. Unless otherwise indicated, it is intended that
priate safety and health practices and determine the applica-
all reagents shall conform to the specifications of the Commit-
bility of regulatory limitations prior to use.
tee onAnalytical Reagents of theAmerican Chemical Society,
where such specifications are available. Other grades may be
2. Referenced Documents
used, provided it is first ascertained that the reagent is of
sufficiently high purity to permit its use without lessening the
2.1 ASTM Standards:
accuracy of the determination.
D1193 Specification for Reagent Water
E29 Practice for Using Significant Digits in Test Data to
6.2 Purity of Water—Unless otherwise indicated, references
Determine Conformance with Specifications
to water shall be understood to mean reagent water conforming
to Type IV of Specification D1193.
3. Summary of Test Method
6.3 Sodium Sulfite Solution (125 g/L)—Dissolve 125 g of
3.1 Thespecimenisreactedwithanexcessofsodiumsulfite
anhydrous sodium sulfite (Na SO ) in water and dilute to 1 L.
2 3
solution and the resulting sodium hydroxide is titrated with
NOTE 1—Sodium sulfite gradually oxidizes to sodium sulfate on
sulfuric acid using thymolphthalein indicator.
exposure to air and therefore should be kept in a tightly closed container.
For best results freshly prepared reagent should be used.
6.4 Sulfuric Acid (0.5 N)—Prepare and standardize 0.5 N
This test method is under the jurisdiction of ASTM Committee D01 on Paint
and Related Coatings, Materials, andApplications and is the direct responsibility of
sulfuric acid (H SO ) against 0.5 N sodium hydroxide (NaOH)
2 4
Subcommittee D01.35 on Solvents, Plasticizers, and Chemical Intermediates.
Current edition approved June 1, 2007. Published June 2007. Originally
approved in 1963. Last previous edition approved in 2002 as D2194 – 02. DOI: Reagent Chemicals, American Chemical Society Specifications , American
10.1520/D2194-02R07. Chemical Society, Washington, DC. For suggestions on the testing of reagents not
For referenced ASTM standards, visit the ASTM website, www.astm.org, or listed by the American Chemical Society, see Analar Standards for Laboratory
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Chemicals, BDH Ltd., Poole, Dorset, U.K., and the United States Pharmacopeia
Standards volume information,
...