1、Designation:D261301(Reapproved 2012)Standard Test Method forCalcium or Zinc in Paint Driers by EDTA Method1This standard is issued under the fixed designation D2613;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last rev
2、ision.A number 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 a titrimetric determination ofcalcium in liquid calcium driers and zinc in liquid zinc driersthat can be di
3、ssolved in a toluene-alcohol mixture and utilizesthe disodium salt of ethylenediaminetetraacetic acid dihydrate(EDTA).1.2 This test method is not applicable to drier blends.1.3 All cations that can be titrated with EDTA in alkalinemedia interfere and must not be present in the sample.1.4 The values
4、stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.5 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
5、 health practices and determine the applica-bility of regulatory 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 In
6、dustrial and Spe-cialty Chemicals(Withdrawn 2009)3E300 Practice for Sampling Industrial Chemicals3.Summary of Test Method3.1 The liquid calcium or zinc drier is dissolved in tolueneand ethyl alcohol and treated with an excess of standard EDTAsolution.The excess is titrated with a standard zinc chlor
7、idesolution using Eriochrome Black-T as the indicator.4.Significance and Use4.1 This test method may be used to confirm the statedcalcium or zinc content of pure liquid calcium or zinc drierssoluble in toluene-alcohol and manufactured for use by thecoatings industry.5.Apparatus5.1 Centrifuge,capable
8、 of developing 1000 to 2000 g.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 Chemical Society,where such specific
9、ations 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 be understood to mean reagent wate
10、r conformingto Type II of Specification D1193.6.3 Buffer SolutionAdd 350 mL of concentrated ammo-nium hydroxide(NH4OH,sp gr 0.90)to 54 g of ammoniumchloride(NH4Cl)and dilute to 1 L with water.6.4 EDTA,Standard Solution(0.05 M)Weigh 18.62 g ofEDTA,dissolve in water and dilute to 1 L.Store in apolyeth
11、ylene or borosilicate glass bottle.6.5 Indicator MixtureTriturate 0.2 g of EriochromeBlack-T and 100 g of sodium chloride(NaCl)and store themixture in a tightly stoppered bottle.This mixture remainsstable for several years.6.6 Zinc Chloride,Standard Solution(0.05 M)Weigh3.2690 g of zinc metal to 0.5
12、 mg and dissolve in 50 mL of1This 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 June 1,2012.Publish
13、ed July 2012.Originally approvedin 1967.Last previous edition approved in 2006 as D2613 01(2006).DOI:10.1520/D2613-01R12.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to
14、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 notlisted by the Am
15、erican 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 Conshohocken,PA 19428-2959
16、.United States1 dilute hydrochloric acid(14 mL of concentrated HCl(sp gr1.42)to 36 mL of water).Warm if necessary.Dilute to 1 L ina volumetric flask.7.Sampling7.1 Take a small sample of liquid drier from bulk using theprocedures in Practice E300 appropriate for the size of thecontainer:Section 19 for tanks and tank cars or Section 23 fordrums and cans.NOTE1Liquid driers are normally homogeneous so that only simplephysical tests,such as specific gravity or solids content,on top and bottomsamples
