BS EN 17417:2020
$167.15
Determination of the ultimate biodegradation of plastics materials in an aqueous system under anoxic (denitrifying) conditions. Method by measurement of pressure increase
| Published By | Publication Date | Number of Pages |
| BSI | 2020 | 36 |
This document specifies a method for the determination of the ultimate anoxic biodegradation of plastics made of organic compounds, where the amount of the produced nitrogen and carbon dioxide at the end of the test is measured.
The test substance is exposed to an inoculum stemming from the denitrification tank of a wastewater treatment plant. Testing is performed under defined laboratory conditions.
Claims of performance are limited to the numerical result obtained in the test and not used for making unqualified claims such as “disposable in waste water treatment plants” and similar.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 2 | undefined |
| 8 | 1 Scope 2 Normative references 3 Terms and definitions |
| 11 | 4 Principle 5 Equipment and materials 5.1 Pressure measurement system |
| 12 | 5.2 Stirring platform or single magnetic stirrers 5.3 Room or incubator with a constant temperature of (20 ± 2) °C 5.4 Argon for the elimination of oxygen from the medium and the gas space |
| 13 | 5.5 Thermometer 5.6 Membrane filter 5.7 Activated sludge from the denitrification tank of a waste water treatment plant 5.8 KOH or used for sorption 5.9 HCl used for titration 5.10 pH meter with electrodes ) 5.11 Pipettes, pipette tips 5.12 Photometric cuvette tests |
| 14 | 5.13 Photometer for the procedures or cuvette tests 5.14 Analytical balance 6 Preparation 6.1 Determination of the volume of each reaction vessel 6.2 Sample preparation 6.3 Preparation of the medium 6.3.1 Reagents 6.3.2 Distilled or deionized water 6.3.3 Preparation of the concentrates |
| 15 | 6.3.3.2 Solution B 6.3.3.3 Solution C 6.3.3.4 Solution D 6.3.3.5 Solution E (trace element solution SL6) ) |
| 16 | 6.3.3.6 Solution F (SL4) ) 6.3.4 Preparation of the medium 6.4 Preparation of the inoculum 7 Test procedure 7.1 Start of test |
| 18 | 7.2 Determination of the initial concentrations (analytical sample) 7.2.1 Determination of pH 7.2.2 Determination of the suspended solids of the inoculum 7.2.3 Determination of ammonia-nitrogen, nitrite-nitrogen and nitrate-nitrogen (for a nitrogen balance) 7.2.4 Protein determination (for a nitrogen and carbon balance) |
| 19 | 7.2.5 Determination of DOC (for a carbon balance) 7.3 Incubation period 7.4 End of test 7.5 Determination of CO2 absorbed in absorption vessels (for a carbon balance) 8 Calculation and evaluation 8.1 Calculation of the theoretical N2 production |
| 20 | 8.2 Calculation of the present N2 production |
| 21 | 8.3 Calculation of the level of degradation related to the nitrogen production 8.4 Generation of a nitrogen balance |
| 22 | 8.5 Evaluation and expression of results 9 Validity of results |
| 23 | 10 Test report |
| 24 | Annex A (informative)Test scheme — Calculation of the maximum permitted initial mass of the test substance and the minimum nitrate concentration A.1 General A.2 Upper pressure measurement limit |
| 25 | A.3 Sorption capacity of the sorption solution (if applicable) A.4 pH buffer capacity of the medium |
| 26 | A.5 Minimum nitrate concentration |
| 27 | Annex B (informative)Examples of degradation curves |
| 30 | Annex C (informative)Calculation of the produced inorganic carbon and preparation of a carbon balance C.1 Calculation of the produced inorganic carbon |
| 31 | C.2 Generation of a carbon balance |
| 32 | C.3 Calculation of the level of biodegradation related to carbon |
