ASTM D5702-2007(2012) 4375 Standard Practice for Field Sampling of Coating Films for Analysis for Heavy Metals《重金属分析用镀膜现场取样的标准操作规程》.pdf

1、Designation: D5702 07 (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

2、 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.1. Scope1.1 This practice covers a method to control the removal ofsamples of coating films from substrates for subsequen

3、t labo-ratory 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 add

4、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. For specific hazardinformation, see Section 5, Note 1 a

5、nd Note 3.2. Referenced 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

6、 Practice for Nondestructive 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 pain

7、t, it is necessary todetermine 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

8、analysis is based on theweight of 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 an

9、y, on a structure.4. Materials and Equipment4.1 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 F

10、ilm Thickness Gage, for measuring total 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-

11、painting programs, and other such factors.5.1.2 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

12、dirt, dust, ordebris.NOTE 1Hazardous materials can 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

13、a square through the coating film to thesubstrate. The 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 Indus

14、trial Protective Coatings.Current edition approved Nov. 1, 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 s

15、erviceastm.org. For Annual Book of ASTMStandards volume information, 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 States1NOTE 2Paint with a density of 1.5 g/cm3and 250 micron

16、s (10 mils)thick will generate one gram of sample in a square that is 5 cm (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

17、 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 avoid including porti

18、ons of the substrate itself inthe sample. Place all chips and scrapings in the sample bag orcontainer.NOTE 3The controlled application of heat to the sample area mayassist in paint removal, but health and safety concerns must be carefullyaddressed before using such methods.5.5 Seal the sample bag or

19、 container, tape shut to avoidaccidental or unauthorized opening, and complete the informa-tion as designated in Section 6.6. Report6.1 Sample ContainersReport the following minimum in-formation on each sample container:6.1.1 Identification number (This is a unique number as-signed to each sample.).

20、6.1.2 Date and time of sampling.6.1.3 Project name and location.6.1.4 Name and signature of technician removing sample.6.2 Chain of Custody FormReport the following minimuminformation:6.2.1 Project name and location.6.2.2 Name of technician removing sample.6.2.3 Unique sample number, date and time o

21、f sampleremoval, and specific location from which sample is removed.6.2.4 The laboratory analysis specified for each component(for example, lead, chromium, etc., as required in the contractdocuments, or as agreed upon between purchaser and seller).Caution the laboratory that fragments of the substra

22、te, ifincluded in the sample, should be removed prior to analysis.6.2.5 Signatures and dates for each transfer of the samplesfrom the technician through the carrier(s) to the laboratoryreceiving the samples.7. Keywords7.1 coating film sampling; coating film identification; haz-ardous elements; heavy

23、 metals; paint film identification; paintfilm sampling; samplingASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any suc

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26、fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this

27、standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).D5702 07 (2012)2