Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 831, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.scitotenv.2022.154860
Keywords
Biodegradation; Biopolymer; Environmental impact; Protocol optimization; Seawater
Categories
Funding
- Bio Based Industries Joint Undertaking through the Glaukos project, under the European Union [887711]
- Ministry of Science and Innovation Spanish Agency of Research (AEI) through the RisBioPlas Project [PCI2020-112110]
- Ministry of Universities of Spain (FPU) [FPU19/02280]
- Universidade de Vigo/CISUG
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Marine ecosystems are threatened by plastics due to their persistence in the environment, lack of proper waste management, and global circulation. However, current international standards are ineffective in predicting the biodegradability of plastics in natural scenarios. In this study, a standard protocol based on biological oxygen demand is presented to determine the marine biodegradability of plastics, aiming to assist policy-makers and the plastic industry in finding truly marine-biodegradable alternatives.
Due to environmental persistence, lack of a proper land-based waste management, and global circulation, marine ecosystems are especially threatened by plastics. The search for alternatives to conventional oil-based polymers gave rise to novel materials commercialized under different green labels based on compostability. However, current international standards are not effective in predicting actual biodegradability of plastic objects in natural scenarios, and degradation of these novel bioplastics in marine conditions is unwarranted. We present a simple and rapid standard protocol based on their biological oxygen demand, intended to support policy-makers and plastic industry in the search for truly marine-biodegradable plastics. Improvements include: development of an environmentally relevant nutrient formulation following Redfield ratio (106C:16 N:1P); use of a natural inoculum representative of marine habitats (sediment pore water); standardization of the test material by grinding to particles below 250 mu m to shorten the incubation period, and selection of a truly biodegradable biopolymer (PHB), used as positive control. This protocol was successfully applied to show that commercial compostable plastics are not biodegradable in marine environments.
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