1.1 本试验方法包括在实验室条件下测定塑料材料（包括配方添加剂）与土壤接触时的需氧生物降解程度和速率。 1.2 该测试方法旨在测量有氧环境中塑料材料相对于参考材料的生物降解性。 1.3 本试验方法适用于对土壤中存在的细菌和真菌无抑制作用的所有塑料材料。 1.4 性能声明应限于试验中获得的数值结果，不得用于不合格的“可生物降解”声明。报告应明确说明试验完成时试验样品和参比样品的净气态碳生成百分比。结果不得外推超过试验的实际持续时间。1.5 以SI单位表示的值应被视为标准。 1.6 本标准并不旨在解决与其使用相关的所有安全性问题（如果有）。本标准的使用者有责任在使用前建立适当的安全、健康和环境实践并确定法规限制的适用性。 具体危害陈述见第节 8 . 1.7 该ASTM测试方法等同于ISO 17556。 1.8 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。======意义和用途====== 5.1 塑料材料在环境中的有氧生物降解性的程度和速率决定了塑料材料被土壤微生物矿化的程度和时间段。随着塑料使用的增加，处理正在成为一个主要问题，该测试方法的结果允许估计塑料在有氧土壤环境中的生物降解程度和停留时间。该测试方法通过测量释放的二氧化碳作为塑料暴露于土壤的时间的函数来确定需氧生物降解的程度。 5.2 土壤是评估塑料在环境中生物降解性的极其丰富的接种物来源。当适当地保持水分含量和氧气可用性时，生物活性是相当可观的，尽管低于其他生物活性环境，如活化污水-污泥或堆肥。

1.1 This test method covers determination under laboratory conditions of the degree and rate of aerobic biodegradation of plastic materials, including formulation additives, in contact with soil. 1.2 This test method is designed to measure the biodegradability of plastic materials relative to a reference material in an aerobic environment. 1.3 This test method is designed to be applicable to all plastic materials that are not inhibitory to the bacteria and fungi present in soil. 1.4 Claims of performance shall be limited to the numerical result obtained in the test and not be used for unqualified “biodegradable” claims. Reports shall clearly state the percentage of net gaseous carbon generation for both the test and reference samples at the completion of the test. Results shall not be extrapolated beyond the actual duration of the test. 1.5 The values stated in SI units are to be regarded as the standard. 1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. A specific hazard statement is given in Section 8 . 1.7 This ASTM test method is equivalent to ISO 17556. 1.8 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 5.1 The degree and rate of aerobic biodegradability of a plastic material in the environment determines the extent to which and time period over which plastic materials are mineralized by soil microorganisms. Disposal is becoming a major issue with the increasing use of plastics, and the results of this test method permit an estimation of the degree of biodegradability and the time period over which plastics will remain in an aerobic soil environment. This test method determines the degree of aerobic biodegradation by measuring evolved carbon dioxide as a function of time that the plastic is exposed to soil. 5.2 Soil is an extremely species-rich source of inoculum for evaluation of the biodegradability of plastics in the environment. When maintained appropriately with regard to moisture content and oxygen availability, the biological activity is quite considerable, although lower than other biologically active environments, such as activated sewage-sludge or compost.