ISO 23977-2:2020
Plastics — Determination of the aerobic biodegradation of plastic materials exposed to seawater — Part 2: Method by measuring the oxygen demand in closed respirometer
This document specifies a laboratory test method for determining the degree and rate of the aerobic biodegradation level of plastic materials. Biodegradation of plastic materials is determined by measuring the oxygen demand in a closed respirometer 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 End of the test
9 Calculation and expression of results
9.1 Calculation
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 End of the test
9 Calculation and expression of results
9.1 Calculation
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