BS EN ISO 17556. Determination of the ultimate aerobic biodegradability of plastics materials in soil by measuring the oxygen demand in a respirometer or the amount of carbon dioxide evolved Plastics, Polymers, Biodegradability, Degradation, Soils, Oxygen dem&, Biological oxygen dem&, Carbon dioxide, Biological analysis & testing, Microbiological analysis, Aerobic bacteria, Test equipment, Testing conditions, Test specimens, Specimen preparation, Humidity