ASTM D3804-02(R2021) pdf free download

ASTM D3804-02(R2021) pdf free download.Standard Test Method for Iron in Paint Driers by EDTA Method
1. Scope
1.1 This test method covers the titrimetric determination of iron in liquid iron driers soluble in isopropyl alcohol and utilizes the disodium salt of ethylenediaminetetraacetic acid dihydrate (EDTA). 1.2 This test method is limited to the determination of the iron content of a liquid drier that does not contain other drier elements. This method is not applicable to drier blends. 1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 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 appro- priate safety, health, and environmental practices and deter- mine the applicability ofregulatory limitations prior to use. 1.5 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
3. Summary of Test Method
3.1 The liquid iron drier is diluted with isopropyl alcohol and the iron chelated with excess standard EDTA. The solution is buffered and the excess EDTA is titrated with standard zinc chloride solution to the Eriochrome Black T end point.
4. Significance and Use
4.1 This test method may be used to confirm the stated content of a liquid iron drier soluble in isopropyl alcohol and manufactured for use in the coatings industry. The content determines activity level.
5. Interferences
5.1 All cations that can be titrated with EDTA in alkaline media interfere and must not be present in the sample or must be masked.
6. Reagents
6.1 Purity of Reagents—Reagent grade chemicals shall be used in all tests. Unless otherwise indicated, it is intended that all reagents shall conform to the specifications of the Commit- tee on Analytical Reagents of the American Chemical Society, where such specifications are available. 4 Other grades may be used, provided it is first ascertained that the reagent is of sufficiently high purity to permit its use without lessening the accuracy of the determination. 6.2 Purity ofWater—Unless otherwise indicated, references to water shall be understood to mean reagent water conforming to Type II of Specification D1193. 6.3 Ammonium Hydroxide (1+3)—Add 10 mL of concen- trated ammonium hydroxide (NH 4 OH, sp gr 0.90) to 30 mL water. 6.4 Buffer Solution—Add 350 mL of concentrated ammo- nium hydroxide (NH 4 OH) to 54 g of ammonium chloride (NH 4 Cl) and dilute to 1 L with water.6.5 EDTA, Standard Solution (0.01 M)—Weigh to 10 mg about 3.73 g of the disodium salt of ethylenediaminetetraacetic acid dihydrate (EDTA), dissolve in water, and dilute to approximately 1 L in a polyethylene or borosilicate glass bottle. 6.6 Hydrochloric Acid (1+3)—Add 3 mL of concentrated hydrochloric acid (HCl, sp gr 1.19) to 9 mL of water. 6.7 Eriochrome Black-T Indicator—Titrate 0.20 g of the concentrated dye with 100 g of NaCl and store in a tightly stoppered jar. This mixture remains stable for several years. 6.8 Isopropyl Alcohol (99.5 %). 6.9 Zinc Chloride, Standard Solution (0.01 M)—Weigh to 0.5 mg about 0.65 g of zinc (Note 1) onto a glazed paper. Transfer to a 1-L volumetric flask and add 25 mL of dilute HCl (7+18) (add 7 mL of concentrated acid (sp gr 1.19) to 18 mL of water). Warm if necessary on a steam bath to dissolve completely. Cool, dilute to the mark with water and mix thoroughly. Calculate the exact molarity of this approximately 0.01-M solution as follows.