标准编号：ISO 14851:2019
中文名称：水介质中塑料材料富氧菌生物降解性的测定 在一端封闭呼吸器中测定需氧量的方法
英文名称：Determination of the ultimate aerobic biodegradability of plastic materials in an aqueous medium — Method by measuring the oxygen demand in a closed respirometer
发布日期：2019-03
标准范围
This document specifies a method, by measuring the oxygen demand in a closed respirometer, for the
determination of the degree of aerobic biodegradability of plastic materials, including those containing
formulation additives. The test material is exposed in an aqueous medium under laboratory conditions
to an inoculum from activated sludge.
If an unadapted activated sludge is used as the inoculum, the test simulates the biodegradation
processes which occur in a natural aqueous environment; if a mixed or pre-exposed inoculum is used,
the method is used to investigate the potential biodegradability of a test material.
The conditions used in this document do not necessarily correspond to the optimum conditions
allowing maximum biodegradation to occur, but this document is designed to determine the potential
biodegradability of plastic materials or give an indication of their biodegradability in natural
environments.
The method enables the assessment of the biodegradability to be improved by calculating a carbon
balance (optional, see Annex E).
The method applies to the following materials.
— Natural and/or synthetic polymers, copolymers or mixtures thereof.
— Plastic materials which contain additives such as plasticizers, colorants or other compounds.
— Water-soluble polymers.
— Materials which, under the test conditions, do not inhibit the microorganisms present in the
inoculum. Inhibitory effects can be determined using an inhibition control or by another appropriate
method (see, for example, ISO 8192 ). If the test material is inhibitory to the inoculum, a lower test
concentration, another inoculum or a pre-exposed inoculum can be used.
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