ASTM_D_6442_-_06_2012.pdf

Designation:D644206(Reapproved 2012)Standard Test Method forDetermination of Copper Release Rate From AntifoulingCoatings in Substitute Ocean Water1This standard is issued under the fixed designation D6442;the number immediately following the designation indicates the year oforiginal adoption or,in 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.1.Scope*1.1 This test method covers the laboratory determination ofthe rate at which copper is released from an antifouling(AF)coating in substitute ocean water.The practical limits forquantifying copper release rates by this method are from 1.8 to500 g cm-2d-1.This range may be extended to 0.2 to 500 gcm-2d-1if the analytical procedure described in Appendix X1 isfollowed.NOTE1The term“substitute ocean water”is used throughout thisstandard to refer to artificial or synthetic seawater prepared in accordancewith Practice D1141.1.2 The procedure contains the preparation steps for therelease rate determination of copper from antifouling paintsincluding apparatus,reagents,holding tank conditions,andsampling point details.Analysis for the concentration of copperin substitute ocean water requires the accurate determination ofcopper at the low parts g L-1(parts per billion,ppb)level.Todetect and correct for reagent impurities,acceptable analyticalprecision standards are necessary.Therefore,the limit ofquantitation(LOQ)for copper in substitute ocean water for theanalytical method shall be 10 g L-1(10 ppb)or less.Theprocedure for determining the LOQ for copper in substituteocean water for the analytical method is found in Annex A2.1.3 A suitable method is described in Appendix X1(graph-ite furnace atomic absorption spectroscopy,GF-AAS).Otheranalytical methods may be utilized with relevant proceduralchanges,as needed,to accommodate selected specific methods.Such methods must meet the limit of quantitation for copper insubstitute ocean water of 10 g L-1(10 ppb)or less.See 1.2.1.4 This results of this test method do not reflect environ-mental copper release rates for antifouling products,and arenot suitable for direct use in the process of generatingenvironmental risk assessments,environmental loadingestimates,or for establishing release rate limits for regulatorypurposes.See also Section 4 on Significance and Use.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 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 practices and to determine the applicability ofregulatory limits prior to use.For specific hazard statements,see Section 7.2.Referenced Documents2.1 ASTM Standards:2D1005 Test Method for Measurement of Dry-Film Thick-ness of Organic Coatings Using MicrometersD1141 Practice for the Preparation of Substitute OceanWaterD1193 Specification for Reagent Water3.Summary of Test Method3.1 The candidate paint is applied to cylindrical test speci-mens.The coated specimens are placed in a tank of substituteocean water where the copper levels are kept below 100 g L-1by circulating the substitute ocean water through a suitablefiltration system(see 5.3).At specified intervals,each speci-men is placed in 1500 mL of substitute ocean water(seeSection 9 for details)and rotated at 60 revolutions per minute(rpm)for 1 h(or less,see 9.8 for further explanation andinstruction).The rate of copper release from the paint isdetermined by measuring copper concentrations of the substi-tute ocean water in the individual measuring containers.3.2 Appendix X1 provides an analytical procedure formeasuring copper concentrations in substitute ocean water.4.Significance and Use4.1 This test method is designed to provide a laboratoryprocedure to quantify and characterize the release rates ofcopper from antifouling coatings in substitute ocean water over1This test method is under the jurisdiction of ASTM Committee D01 on Paintand Related Coatings,Materials,and Applications and is the direct responsibility ofSubcommittee D01.45 on Marine Coatings.Current edition approved June 1,2012.Published August 2012.Originallyapproved in 1999.Last previous edition approved in 2006 as D6442 06.DOI:10.1520/D6442-06R12.2For 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 the standards Document Summary page onthe ASTM website.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 a period of immersion under specified laboratory conditions ofconstant temperature,pH,salinity,and low copper concentra-tion.Quantitative measurement o