Standard Test Method for
Total Rare Earth Metals in Paint Driers by EDTA Method1
This standard is issued under the fixed designation D 3989; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of the 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.
1.1 This test method covers the titrimetric determination of
rare earth metals in liquid rare earth metal driers and utilizes
the disodium salt of ethylenediaminetetraacetic acid dihydrate
1.2 This test method is limited to the determination of the
rare earth metal content of a liquid rare earth metal drier that
does not contain other drier elements. The method is not
applicable to drier blends.
1.3 This test method has been tested in concentrations of
6 % cerium and 6 % rare earth metals, but there is no reason to
believe that it is not suitable for higher or lower drier metal
concentrations provided specimen size is adjusted accordingly.
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.
2. Referenced Documents
2.1 ASTM Standards:
D 600 Specification for Liquid Paint Driers2
D 1193 Specification for Reagent Water3
E 180 Practice for Determining the Precision of ASTM
Methods for Analysis and Testing of Industrial and Specialty Chemicals4
E 300 Practice for Sampling Industrial and Specialty
3. Summary of Test Method
3.1 A diluted solution of the drier is complexed with an
excess of EDTA, the pH adjusted to 5.0 and then titrated with
zinc chloride solution to a xylenol orange endpoint.
4. Significance and Use
4.1 This test method may be used to confirm the stated
content of a pure, liquid rare earth metal drier manufactured for
use in the coatings industry.
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