ASTM D1767-89(2003)

Standard Test Method for Ethylene Diamine Tetraacetate (EDTA) in Soaps or Synthetic Detergents

ABSTRACT
This test method covers the determination of ethylene diamine tetraacetate (EDTA) in soaps and synthetic detergents. Throughout this test method EDTA represents the hydrated disodium salt containing 2 moles of H2O. In the chemical literature this is frequently abbreviated to Na2H2Y4·2H2O. Reagents to be used in the EDTA content determination include copper sulfate solution and PAN indicator solution. The procedure in EDTA determination is described as follows: A portion of the sample estimated to contain 1 % of EDTA disodium salt shall be weighed. The amount of the sample used depending upon the actual amount of EDTA present shall be varied. Then the sample shall be weighed into a 250-mL beaker, diluted to a certain volume with water, and adjusted the pH to approximately 5.0 by the addition of acetic acid. Four drops of the PAN indicator solution shall be added. The sample with CuSO4 solution shall be titrated until a transition in color from yellow to red occurs. Afterwards, the percentage of EDTA disodium salt in the sample shall be calculated.
SCOPE
1.1 This test method covers the determination of ethylene diamine tetraacetate (EDTA) in soaps and synthetic detergents. Throughout this test method EDTA represents the hydrated disodium salt containing 2 moles of H2O. In the chemical literature this is frequently abbreviated to Na2H2Y4·2H 2O.
1.2 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. Material Safety Data Sheets are available for reagents and materials. Review them for hazards prior to usage.

General Information

• Status: Historical
• Publication Date: 25-May-1989
• ICS: 71.100.40 - Surface active agents
• Technical Committee: D12 - Soaps and Other Detergents
• Drafting Committee: D12.12 - Analysis and Specifications of Soaps, Synthetics, Detergents and their Components

Relations

• Replaces: ASTM D1767-89(1995)e1 - Standard Test Method for Ethylene Diamine Tetraacetate (EDTA) in Soaps or Synthetic Detergents
• Effective Date: 26-May-1989
• Replaced By: ASTM D1767-89(2009) - Standard Test Method for Ethylene Diamine Tetraacetate (EDTA) in Soaps or Synthetic Detergents
• Effective Date: 01-Oct-2009

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:D1767–89(Reapproved 2003)
Standard Test Method for
Ethylene Diamine Tetraacetate (EDTA) in Soaps or Synthetic
1
Detergents
This standard is issued under the fixed designation D1767; 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.
1. Scope 4. Reagents
1.1 This test method covers the determination of ethylene 4.1 Copper Sulfate Solution (1 mL = 0.0037 g EDTA diso-
diamine tetraacetate (EDTA) in soaps and synthetic detergents. dium salt)—Dissolve 2.497 g of copper sulfate (CuSO ·5H O)
4 2
Throughout this test method EDTA represents the hydrated in water and dilute to 1 L. The actual EDTAequivalent should
disodium salt containing 2 moles of H O. In the chemical be determined by the titration of a known weight of EDTA
2
literature this is frequently abbreviated to Na H Y·2H O. disodium salt.
2 2 4 2
1.2 This standard does not purport to address all of the 4.2 PAN Indicator Solution—Dissolve 0.1 g of 1-(2
4
safety concerns, if any, associated with its use. It is the pyridylazo)-2-naphathol in 100 mL of methyl alcohol.
responsibility of the user of this standard to establish appro-
5. Procedure
priate safety and health practices and determine the applica-
5.1 Weigh to the nearest 0.001ga3to5-g portion of the
bility of regulatory limitations prior to use. Material Safety
Data Sheets are available for reagents and materials. Review sample estimated to contain 1 % of EDTA disodium salt. Vary
the amount of the sample used depending upon the actual
them for hazards prior to usage.
amount of EDTA present. Weigh into a 250-mL beaker, dilute
2. Referenced Documents
to approximately 75 mL with water, and adjust the pH to
2
2.1 ASTM Standards: approximately 5.0 by the addition of acetic acid (Note 1).Add
D1193 Specification for Reagent Water 4 drops of the PAN indicator solution. Titrate the sample with
CuSO solution to a transition in color from yellow to red.
4
3. Purity of Reagents
NOTE 1—Removal of soap fatty acids by filtration through a wet filter
3.1 Purity of Reagents—Reagent grade chemicals shall be
paper prior to titration will sharpen the end point.
used in all tests. Unless otherwise indicated, it is intended that
all reagents shall conform to the specifications of the Commit- 6. Calculation
tee onAnalytical Reagents of theAmerican Chemical Society,
6.1 Calculate the percentage of EDTA disodium salt in the
3
where such specifications are available. Other grades may be
sample as follows:
used, provided it is first ascertained that the reagent is of
EDTA, weight % 5 ~AB/C! 3 100 (1)
sufficiently high purity to permit its use without lessening the
accuracy of the determination.
3.2 Unless otherwise indicated, references to water shall be
where:
understood to mean reagent water conforming to Speci
...