1、Designation:D333585a(Reapproved 2014)Standard Test Method forLow Concentrations of Lead,Cadmium,and Cobalt in Paintby Atomic Absorption Spectroscopy1This standard is issued under the fixed designation D3335;the number immediately following the designation indicates the year oforiginal adoption or,in
2、 the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope1.1 This
3、 test method covers the determination of lead2contents between 0.01 and 5%,cadmium contents between 50and 150 ppm(mg/kg),and cobalt contents between 50 and2000 ppm(mg/kg)present in the nonvolatile portion of liquidcoatings or contained in dried films.There is no reason tobelieve that higher levels o
4、f all three elements could not bedetermined by this test method,provided that appropriatedilutions and adjustments in specimen size and reagent quan-tities are made.1.2 Only pigmented coatings were used for evaluating thistest method,but there is no reason to believe that varnishes andlacquers could
5、 not be analyzed successfully,provided thatappropriate precautions are taken.1.3 This test method is not applicable to the determinationof lead in samples containing antimony pigments(low recov-eries are obtained).1.4 If lead is present in the sample to be analyzed in theform of an organic lead comp
6、ound at a concentration greaterthan 0.1%,small losses of lead may occur,resulting in slightlypoorer precision than shown in Section 12.1.5 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.1.6 This standard does not purport to add
7、ress 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 regulatory limitations prior to use.Specific hazardstatements are given in Section 7.2.Referenc
8、ed Documents2.1 ASTM Standards:3D1193 Specification for Reagent WaterD2832 Guide for Determining Volatile and Nonvolatile Con-tent of Paint and Related Coatings3.Summary of Test Method3.1 The specimen of liquid coating or dried film is preparedfor analysis by dry ashing.The content of lead,cadmium,o
9、rcobalt of an acid extract of the ash is determined by atomicabsorption spectroscopy.4.Significance and Use4.1 The permissible level of heavy metals in certain coat-ings is specified by governmental regulatory agencies.This testmethod provides a fully documented procedure for determininglow concentr
10、ations of lead,cadmium,and cobalt present inboth water and solvent-reducible coatings to determine com-pliance.5.Apparatus5.1 Atomic Absorption Spectrophotometer,consisting of anatomizer and either a single-or three-slot burner;gas pressureregulating and metering devices for air and acetylene;lead,c
11、admium,and cobalt source lamps4with a regulated constant-current supply;a monochromator and associated optics;aphotosensitive detector connected to an electronic amplifier;and a readout device.1This test method is under the jurisdiction of ASTM Committee D01 on Paintand Related Coatings,Materials,an
12、d Applications and is the direct responsibility ofSubcommittee D01.21 on Chemical Analysis of Paints and Paint Materials.Current edition approved July 1,2014.Published July 2014.Originally approvedin 1974.Last previous edition approved in 2009 as D3335 85a(2009).DOI:10.1520/D3335-85AR14.2Vandeberg,J
13、.T.,Swafford,H.D.,and Scott,R.W.,“Determination of LowConcentrations of Lead in Paint,”Journal of Paint Technology,Vol 47,No.604,May 1975.3For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume info
14、rmation,refer to the standards Document Summary page onthe ASTM website.4Both hollow cathode lamps and electrodeless discharge lamps have been foundsatisfactory for this purpose.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 5.2 Muffle F
15、urnace,capable of maintaining 500 6 10C.5.3 Crucibles,wide-form,porcelain,glazed inside and out-side except for the outside bottom surface,approximately30-mL capacity,50-mm rim diameter and 31-mm height.55.4 Hot Plate,with variable surface temperature controlover the range from 70 to 200C.5.5 High-S
16、ilica Glass Beakers,6100 and 250-mL.5.6 Volumetric Flasks,50,100,and 1000-mL.5.7 Dropping Bottles,14or 7 or 15-mL(12-oz)capacity.5.8 Glass or Disposable Syringes,5 or 10-mL capacity.5.9 Pipets,1,2,5,and 10-mL capacity.5.10 Paint Shaker.5.11 Paint Draw-Down Bar.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 Chemi
