1、Designation:D570207(Reapproved 2012)Standard Practice forField Sampling of Coating Films for Analysis for HeavyMetals1This standard is issued under the fixed designation D5702;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year
2、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.1.Scope1.1 This practice covers a method to control the removal ofsamples of coating films from substrates for subsequent labo-rato
3、ry analysis for heavy metal content on a mass basis.Thistechnique can be used in the field,the fabricating shop,orlaboratory.1.2 The values stated in SI units are to be regarded as thestandard.The values in parentheses are for information only.1.3 This standard does not purport to address all of the
4、safety 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.For specific hazardinformation,see Section 5,Note 1 and Note 3.2.Reference
5、d Documents2.1 ASTM Standards:2D4138 Practices for Measurement of Dry Film Thickness ofProtective Coating Systems by Destructive,Cross-Sectioning MeansD6132 Test Method for Nondestructive Measurement of DryFilm Thickness of Applied Organic Coatings Using anUltrasonic GageD7091 Practice for Nondestru
6、ctive Measurement of DryFilm Thickness of Nonmagnetic Coatings Applied toFerrous Metals and Nonmagnetic,Nonconductive Coat-ings Applied to Non-Ferrous Metals3.Significance and Use3.1 Prior to beginning a project that involves the removal,cutting,grinding,or burning of paint,it is necessary todetermi
7、ne if the coating contains hazardous materials,such aslead,as certain requirements for worker and environmentalprotection may need to be imposed.The presence and quantityof hazardous materials in a paint can be determined throughlaboratory analysis;however,since the analysis is based on theweight of
8、 the specimen,the removal of the sample must beproperly controlled to improve the reliability of the test results.The number and location of samples to be removed must alsobe determined to characterize properly the extent of thepresence of hazardous materials,if any,on a structure.4.Materials and Eq
9、uipment4.1 Sample Collection ContainerA clean plastic bag orrigid container comprised of a material such as polyethylenethat will not contaminate the sample.4.2 Straight Edge or Ruler.4.3 Knife or Chisel,cleaned and sharpened,for removingpaint samples.4.4 Dry Film Thickness Gage,for measuring total
10、coatingthickness.5.Procedure5.1 Select a sufficient number of areas for coating removalthat properly characterize the coatings on the structure.5.1.1 Selection may be based on painting history,knowl-edge of previously applied coatings,prior touch-up and re-painting programs,and other such factors.5.
11、1.2 Select areas that properly characterize the range ofthickness found.Dry film thickness can be measured inaccordance with Test Methods D4138,D6132,or PracticeD7091.5.1.3 Remove a minimum of three samples.5.2 At each sample site,clean the surface of dirt,dust,ordebris.NOTE1Hazardous materials can
12、be present in surface debris andchalk which may be removed during cleaning.Thus,consideration shouldbe given to collecting this surface debris and chalk for analysis.5.3 At each sample site,use a knife and straight edge toscribe the perimeter of a square through the coating film to thesubstrate.The
13、square should be of sufficient size to give a onegram sample.1This practice is under the jurisdiction of ASTM Committee D01 on Paint andRelated Coatings,Materials,and Applications and is the direct responsibility ofSubcommittee D01.46 on Industrial Protective Coatings.Current edition approved Nov.1,
14、2012.Published November 2012.Originallyapproved in 1995.Last previous edition approved in 2007 as D5702 07.DOI:10.1520/D5702-07R12.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information
15、,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 NOTE2Paint with a density of 1.5 g/cm3and 250 microns(10 mils)thick will generate one gram of sample in a square that is 5 cm
16、(2 in.)ona side assuming 100 percent of the material is collected.Paint densitynormally ranges from 1.1 to 2.5 g/cm3.Adjust the sample size based ondensity,thickness and collection efficiency.5.4 Remove essentially all of the coating within the squaredown to the substrate by scraping,by making closely-spacedparallel scribes to disbond ribbons of the coating,or othercontrolled means that permit collection of all of the filmscrapings.Take extreme care to remove the coating to thesubstrate,but avoi