ISO 23977-1:2020
Plastics — Determination of the aerobic biodegradation of plastic materials exposed to seawater — Part 1: Method by analysis of evolved carbon dioxide
This document specifies a laboratory test method for determining the degree and rate of the aerobic biodegradation level of plastic materials. Biodegradation is determined by measuring the CO2 evolved from plastic materials when exposed to seawater sampled from coastal areas under laboratory conditions.
The conditions described in this document might not always correspond to the optimum conditions for the maximum degree of biodegradation, however this test method is designed to give an indication of the potential biodegradability of plastic materials.
NOTE This document addresses plastic materials but can also be used for other materials.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Test environment
6 Reagents
7 Apparatus
8 Procedure
8.1 Test material
8.2 Reference materials
8.3 Test set up
8.4 Pre-conditioning phase
8.5 Start of the test
8.6 Carbon dioxide measurement
8.7 End of the test
9 Calculation and expression of results
9.1 Calculation
9.1.1 Amount of CO2 produced
9.1.2 Percentage of biodegradation
9.2 Visual inspection
9.3 Expression and interpretation of results
10 Validity of results
11 Test report
Annex A (informative) Example of a respirometric system
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Test environment
6 Reagents
7 Apparatus
8 Procedure
8.1 Test material
8.2 Reference materials
8.3 Test set up
8.4 Pre-conditioning phase
8.5 Start of the test
8.6 Carbon dioxide measurement
8.7 End of the test
9 Calculation and expression of results
9.1 Calculation
9.1.1 Amount of CO2 produced
9.1.2 Percentage of biodegradation
9.2 Visual inspection
9.3 Expression and interpretation of results
10 Validity of results
11 Test report
Annex A (informative) Example of a respirometric system
Bibliography