Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 838, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.scitotenv.2022.156396
Keywords
Biodegradable microplastics; Extraction method; Aquatic organisms; Digestion; Density separation
Categories
Funding
- National Natural Science Foundation of China [42077384, 21777068]
- Fundamental Research Funds for the Central Universities [021114380176]
- Foundation of State Key Laboratory of Pollution Control and Resource Reuse [PCRRF2022]
- Key Laboratory of Pesticide Environmental Assessment and Pollution Control, Ministry of Environmental Protection
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Biodegradable plastics (BPs) are promising alternatives to conventional plastics, but their biodegradation conditions are strict. This study used multi-criteria decision-making (MCDM) methods to comprehensively evaluate and optimize the extraction protocols of five biodegradable microplastics (BMPs) from aquatic species, and identified the optimal extraction method.
Biodegradable plastics (BPs) have been given high hopes to substitute conventional plastics, but their biodegradation requires strict conditions. BPs can accumulate for a long time in the environment and even derive biodegradable microplastics (BMPs), thus threatening wildlife and ecosystems. However, no efficient method is available for extracting BMPs from organisms' tissues. This study used multi-criteria decision-making (MCDM) methods to comprehensively evaluate and optimize extraction protocols of five BMPs from economic aquatic species. Digestion time, digestion efficiency, mass loss, cost, polymer integrity and size change were selected as evaluating indictors. According to the screening results of MCDM methods, Pepsin+H2O2 was selected as the optimal digestion method of BMPs because of its highest comprehensive score, which has high digestion efficiency (99.56%) and minimum plastic damage. Compared with olive oil, NaI is more suitable for separating BMPs from the digested residues. Furthermore, the combination of Pepsin+H2O2 digestion and NaI density separation was used to extract all five kinds of BMPs from the bivalve, crab, squid, and crayfish tissues, and all the recovery rates exceeded 80%. These results suggest that the optimal protocol is practicable to extract various BMPs from various aquatic organisms.
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