ISO 19679:2020 PDF
Plastics — Determination of aerobic biodegradation of non-floating plastic materials in a seawater/sediment interface — Method by analysis of evolved carbon dioxide
Plastics — Determination of aerobic biodegradation of non-floating plastic materials in a seawater/sediment interface — Method by analysis of evolved carbon dioxide
- Статус документа:
- Действующий
- Формат:
- Электронный (PDF)
- Количество страниц:
- 12
- Дата публикации:
- 5 июня 2020 г.
- Издание:
- ISO IS 19679 edition 2 version 1
- ICS:
- 83.080.01
This document specifies a test method to determine the degree and rate of aerobic biodegradation of plastic materials when settled on marine sandy sediment at the interface between seawater and the seafloor, by measuring the evolved carbon dioxide (CO2). This test method can also be applied to other solid materials. This test method is a simulation under laboratory conditions of the habitat found in different seawater/sediment-areas in the sea, e.g. in a benthic zone where sunlight reaches the ocean floor (photic zone) that, in marine science, is called sublittoral zone The determination of biodegradation of plastic materials and other solid materials buried in marine sediment is outside the scope of this document. NOTE Measurement of aerobic biodegradation can also be obtained by monitoring the oxygen consumption, as described in ISO 18830. The conditions described in this document do not always correspond to the optimum conditions for the maximum degree of biodegradation to occur.
Abstract
Overview
ISO 19679:2020 specifies a laboratory test method for measuring the aerobic biodegradation of non‑floating plastic materials located at the interface between seawater and sandy marine sediment. The method quantifies biodegradation by analysing the amount of evolved carbon dioxide (CO2) and comparing it to the theoretical CO2 yield (ThCO2) calculated from the material’s total organic carbon (TOC). This is a simulation of benthic/sub‑littoral conditions (photic zone) where an item has sunk and settled on the seafloor surface. The standard does not cover plastics buried deeper in sediment.
Key topics and technical requirements
- Test principle: Closed‑vessel respirometric measurement of CO2 evolved during aerobic microbial degradation; results expressed as percent biodegradation against ThCO2.
- Test environment: Incubation in dark or diffuse light at a controlled temperature (preferably 15–25 °C, not exceeding 28 °C, ±2 °C). Systems must be free from vapours inhibitory to microorganisms.
- Materials and reagents: Use of natural or artificial seawater (example artificial recipe included in the standard) and sandy marine sediment; distilled/deionized water with DOC
Технические детали
- Технический комитет
- ISO/TC 61/SC 14 - Environmental aspects
- SKU
- ISO 19679:2020
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