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Designation: D5526 − 18Standard Test Method forDetermining Anaerobic Biodegradation of Plastic MaterialsUnder Accelerated Landf i ll Conditions 1This standard is issued under the f i xed designation D5526; 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. Scope1.1 This test method covers determination of the degree andrate of anaerobic biodegradation of plastic materials in anaccelerated-landf i ll test environment. This test method is alsodesigned to produce mixtures of household waste and plasticmaterials after different degrees of decomposition under con-ditions that resemble landf i ll conditions. The test materials aremixed with pretreated household waste and exposed to amethanogenic inoculum derived from anaerobic digesters op-erating only on pretreated household waste. The anaerobicdecomposition occurs under dry (more than 30 % total solids)and static nonmixed conditions. The mixtures obtained afterthis test method can be used to assess the environmental andhealth risks of plastic materials that are degraded in a landf i ll.1.2 This test method is designed to yield a percentage ofconversion of carbon in the sample to carbon in the gaseousform under conditions that resemble landf i ll conditions. It ispossible that this test method will not simulate all conditionsfound in landf i lls, especially biologically inactive landf i lls.This test method more closely resembles those types oflandf i lls in which the gas generated is recovered or evenactively promoted, or both, for example, by inoculation (code-position of anaerobic sewage sludge and anaerobic leachaterecirculation), moisture control in the landf i ll (leachaterecirculation), and temperature control (short-term injection ofoxygen and heating of recirculated leachate) (1-7). 21.3 This test method is designed to produce partially de-graded mixtures of municipal solid waste and plastics that canbe used to assess the ecotoxicological risks associated with theanaerobic degradation of plastics after various stages of an-aerobic biodegradation in a landf i ll.1.4 Claims of performance shall be limited to the numericalresult obtained in the test and not be used for unqualif i ed“biodegradable” claims. Reports shall clearly state the percent-age of net gaseous carbon generation for both the test andreference samples at the completion of the test. Furthermore,results shall not be extrapolated past the actual duration of thetest.1.5 The values stated in SI units are to be regarded as thestandard.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, health, and environmental practices and deter-mine the applicability of regulatory limitations prior to use.Specif i c hazards statements are given in Section 8.N OTE 1—There is no known ISO equivalent to this standard.1.7 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards: 3D618 Practice for Conditioning Plastics for TestingD883 Terminology Relating to PlasticsD1293 Test Methods for pH of WaterD1888 Methods Of Test for Particulate and Dissolved Matterin Water (Withdrawn 1989) 4D2908 Practice for Measuring Volatile Organic Matter inWater 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 Chromatography1 This 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 Sept. 15, 2018. Published October 2018. Originallyapproved in 1994. Last previous edition approved in 2012 as D5526 – 12. DOI:10.1520/D5526-18.2 The boldface numbers in parentheses refer to the list of references at the end ofthis standard.3 For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at service@astm.org. For Annual Book of ASTMStandards volume information, refer to the standard’s Document Summary page onthe ASTM website.4 The last approved version of this historical standard is referenced onwww.astm.org.Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.1