标准编号：ISO 5148:2022
中文名称：塑料 在中温实验室试验条件下测定固体塑料材料的特定需氧生物降解速率和消失时间（DT50）
英文名称：Plastics — Determination of specific aerobic biodegradation rate of solid plastic materials and disappearance time (DT50) under mesophilic laboratory test conditions
发布日期：2022-06
标准范围
This document specifies a method to determine the specific aerobic biodegradation rate of solid, non- water soluble plastic materials under mesophilic conditions.
NOTE The specific aerobic biodegradation rate (which, strictly speaking, is a specific mineralization rate, implying the assessment of the conversion of organic carbon into CO but neglecting biomass formation) is expressed as amount of carbon mineralized into CO , per unit time, per unit area.
The method described in this document does not provide information on the ultimate aerobic biodegradability of the tested samples. Biodegradability criteria for plastic materials under mesophilic conditions are provided for example by ISO 23517, and ISO 22403. The method described in this document shall be used to determine the DT50 only when the plastic material is proven to be intrinsically biodegradable using suitable standard specifications such as ISO 23517 and ISO 22403. Furthermore, the biodegradation rate determined on plastic materials whose ultimate biodegradation has not been proven, shall not be considered as a specific characteristic of the whole material.
This document only considers the evolution of CO as direct measurement of mineralization of the 2 tested sample.
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