1、Designation:D533815Standard Test Method forDetermining Aerobic Biodegradation of Plastic MaterialsUnder Controlled Composting Conditions,IncorporatingThermophilic Temperatures1This standard is issued under the fixed designation D5338;the number immediately following the designation indicates the yea
2、r 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 determines the degree and rate ofaerobic bio
3、degradation of plastic materials on exposure to acontrolled-compostingenvironmentunderlaboratoryconditions,at thermophilic temperatures.This test method isdesigned to yield reproducible and repeatable test results undercontrolled conditions that resemble composting conditions,where thermophilic temp
4、eratures are achieved.The test sub-stances are exposed to an inoculum that is derived fromcompost from municipal solid waste.The aerobic compostingtakes place in an environment where temperature,aeration andhumidity are closely monitored and controlled.NOTE1During composting,thermophilic temperature
5、s are mostreadily achieved in large-scale,professionally-managed facilities.However,these temperatures may also be reached in smaller residentialcomposting units,frequently referred to as“backyard”or“home”com-posting.1.2 This test method is designed to yield a percentage ofconversion of carbon in th
6、e sample to carbon dioxide.The rateof biodegradation is monitored as well.1.3 This test method is designed to be applicable to allplastic materials,which are intended to be composted infacilities that achieve thermophilic temperatures.1.4 The values stated in SI units are to be regarded as thestanda
7、rd.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 health practices and determine the applica-bility of regulatory limitations prior to use.Specific hazard
8、statements are given in Section 8.1.6 This test method is equivalent to ISO 14855.2.Referenced Documents2.1 ASTM Standards:2D618 Practice for Conditioning Plastics for TestingD883 Terminology Relating to PlasticsD1293 Test Methods for pH of WaterD2908 Practice for Measuring Volatile Organic Matter i
9、nWater by Aqueous-Injection Gas ChromatographyD3590 Test Methods for Total Kjeldahl Nitrogen in WaterD4129 Test Method for Total and Organic Carbon in Waterby High Temperature Oxidation and by CoulometricDetectionE260 Practice for Packed Column Gas ChromatographyE355 Practice for Gas Chromatography
10、Terms and Relation-ships2.2 APHAAWWAWPCF Standards:2540 D Total Suspended Solids Dried at 103 to 105C32540 E Fixed and Volatile Solids Ignited at 550C32.3 ISO Standard:ISO 14855 PlasticsEvaluation of the Ultimate AerobicBiodegradability and Disintegration Under ControlledComposting ConditionsMethod
11、by Analysis of Re-leased Carbon Dioxide43.Terminology3.1 DefinitionsDefinitions of terms applying to this testmethod appear in Terminology D883.4.Summary of Test Method4.1 This test method consists of the following:4.1.1 Selection of plastic material for the determination ofthe aerobic biodegradabil
12、ity in a controlled-compostingsystem,1This test method is under the jurisdiction of ASTM Committee D20 on Plasticsand is the direct responsibility of Subcommittee D20.96 on EnvironmentallyDegradable Plastics and Biobased Products.Current edition approved June 1,2015.Published June 2015.Originallyapp
13、roved in 1992.Last previous edition approved in 2011 as D5338-11.DOI:10.1520/D5338-15.2For 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
14、 onthe ASTM website.3Standard Methods for the Examination of Water and Wastewater,17th Edition,1989,American Public Health Association,1740 Broadway,New York,NY 19919.4Available from American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.org.*A Summary o
15、f 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 4.1.2 Obtaining an inoculum from composted municipalsolid waste,4.1.3 Exposing the test substances to a controlled aerobiccomposting proc
16、ess in conjunction with the inoculum,4.1.4 Measuring carbon dioxide evolved as a function oftime,and4.1.5 Assessing the degree of biodegradability.4.2 The percentage of biodegradability is obtained by de-termining the percentage of carbon in the test substance that isconverted to CO2during the duration of the test.This percent-age of biodegradability will not include the amount of carbonconverted from the test substance that is converted to cellbiomass and that is not,in turn,metabolized to CO2d
