1、Designation:D380402(Reapproved 2014)Standard Test Method forIron in Paint Driers by EDTA Method1This standard is issued under the fixed designation D3804;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A num
2、ber in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers the titrimetric determination ofiron in liquid iron driers soluble in isopropyl alcohol andutilizes the disodium salt
3、of ethylenediaminetetraacetic aciddihydrate(EDTA).1.2 This test method is limited to the determination of theiron content of a liquid drier that does not contain other drierelements.This method is not applicable to drier blends.1.3 The values stated in SI units are to be regarded asstandard.No other
4、 units of measurement are included in thisstandard.1.4 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of reg
5、ulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D600 Specification for Liquid Paint DriersD1193 Specification for Reagent WaterE180 Practice for Determining the Precision of ASTMMethods for Analysis and Testing of Industrial and Spe-cialty Chemicals(Withdrawn 2009)3E300 Pr
6、actice for Sampling Industrial Chemicals3.Summary of Test Method3.1 The liquid iron drier is diluted with isopropyl alcoholand the iron chelated with excess standard EDTA.The solutionis buffered and the excess EDTA is titrated with standard zincchloride solution to the Eriochrome Black T end point.4
7、.Significance and Use4.1 This test method may be used to confirm the statedcontent of a liquid iron drier soluble in isopropyl alcohol andmanufactured for use in the coatings industry.The contentdetermines activity level.5.Interferences5.1 All cations that can be titrated with EDTA in alkalinemedia
8、interfere and must not be present in the sample or mustbe masked.6.Reagents6.1 Purity of ReagentsReagent grade chemicals shall beused in all tests.Unless otherwise indicated,it is intended thatall reagents shall conform to the specifications of the Commit-tee on Analytical Reagents of the American C
9、hemical Society,where such specifications are available.4Other grades may beused,provided it is first ascertained that the reagent is ofsufficiently high purity to permit its use without lessening theaccuracy of the determination.6.2 Purity of WaterUnless otherwise indicated,referencesto water shall
10、 be understood to mean reagent water conformingto Type II of Specification D1193.6.3 Ammonium Hydroxide(1+3)Add 10 mL of concen-trated ammonium hydroxide(NH4OH,sp gr 0.90)to 30 mLwater.6.4 Buffer SolutionAdd 350 mL of concentrated ammo-nium hydroxide(NH4OH)to 54 g of ammonium chloride(NH4Cl)and dilu
11、te to 1 L with water.6.5 EDTA,Standard Solution(0.01 M)Weigh to 10 mgabout 3.73 g of the disodium salt of ethylenediaminetetraaceticacid dihydrate(EDTA),dissolve in water,and dilute toapproximately 1 L in a polyethylene or borosilicate glassbottle.6.6 Hydrochloric Acid(1+3)Add 3 mL of concentratedhy
12、drochloric acid(HCl,sp gr 1.19)to 9 mL of water.1This test method is under the jurisdiction of ASTM Committee D01 on Paintand Related Coatings,Materials,and Applications and is the direct responsibility ofSubcommittee D01.21 on Chemical Analysis of Paints and Paint Materials.Current edition approved
13、 July 1,2014.Published July 2014.Originally approvedin 1979.Last previous edition approved in 2008 as D3804 02(2008).DOI:10.1520/D3804-02R14.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume i
14、nformation,refer to the standards Document Summary page onthe ASTM website.3The last approved version of this historical standard is referenced onwww.astm.org.4Reagent Chemicals,American Chemical Society Specifications,AmericanChemical Society,Washington,DC.For suggestions on the testing of reagents
15、 notlisted by the American Chemical Society,see Analar Standards for LaboratoryChemicals,BDH Ltd.,Poole,Dorset,U.K.,and the United States Pharmacopeiaand National Formulary,U.S.Pharmacopeial Convention,Inc.(USPC),Rockville,MD.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Consho
16、hocken,PA 19428-2959.United States1 6.7 Eriochrome Black-T IndicatorTitrate 0.20 g of theconcentrated dye with 100 g of NaCl and store in a tightlystoppered jar.This mixture remains stable for several years.6.8 Isopropyl Alcohol(99.5%).6.9 Zinc Chloride,Standard Solution(0.01 M)Weigh to0.5 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 mLof water).Warm if necessary on a steam b
