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首页> 外文期刊>Environmental toxicology and chemistry >Evaluating the Ready Biodegradability of Biodegradable Plastics
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Evaluating the Ready Biodegradability of Biodegradable Plastics

机译：评估可生物降解塑料的准备生物降解性

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Reducing the environmental burden and assessing the safety of plastics are huge global challenges. However, standard test data on the ready biodegradability of plastics are limited. We evaluated the ready biodegradability of 8 biodegradable plastics using Organisation for Economic Co-operation and Development (OECD) test guideline 301F with nonspecific bacteria and examined the effects of prolonging the test duration to a maximum of 90 d. Cellulose used as a potential reference material for plastics was not comparable to the reference material of OECD test guideline 301, but it may be improved by using a test concentration lower than the typical test concentration (100 mg/L). Of the 8 plastics examined, polyamide 4, poly(3-hydroxybutyrate-co-3-hydroxyhexanoate), polycaprolactone, and poly(butylene succinate adipate; PBSA) were biodegraded by 60% by day 28 and considered to show ready biodegradability. Poly(3-hydroxybutyrate; PHB), poly(3-hydroxybutyric acid-co-3-hydroxyvaleric acid; PHBV), and poly(butylene succinate; PBS) were biodegraded but did not fulfill the ready biodegradability criteria. Because the typical test concentration is considered to have negative effects on biodegradation and calculation of biodegradation percentage, using a lower concentration may result in PHB, PHBV, and PBS fulfilling the ready biodegradability criteria. Poly( d, l-lactide; PLA) was not biodegraded. The biodegradation of PBS and PBSA was noted to vary depending on the used inoculum and/or particle size. For the 7 plastics except PLA, the percentage biodegradation on day 60 was larger than that on day 28, indicating that a longer test period could be useful for evaluating the environmental persistence of plastics. In tests in which the plastics were not biodegraded by day 60, no marked biodegradation was observed by day 90. Environ Toxicol Chem 2021;00:1-7. (c) 2021 SETAC
机译：减少环境负担和评估塑料的安全是巨大的全球挑战。然而，关于塑料的Ready Docegrodability的标准测试数据有限。我们使用经济合作和开发组织（OECD）测试指南301F与非特异性细菌进行了准备的8种可生物降解的塑料的可获得的可生物降解性，并检查了延长测试持续时间至最多90℃的影响。用作塑料的潜在参考材料的纤维素与OECD试验准则301的参考材料不相当，但是通过使用低于典型测试浓度（100mg / L）的测试浓度可以提高。在检查的8个塑料中，聚酰胺4，聚（3-羟基丁酸酯-CO-3-羟基己酸酯），聚己内酯和聚（丁二酸酯己二酸盐; PBSA）被＆GT; 60％在28天，并考虑显示出易生物降解性。聚（3-羟基丁酸酯; PHB），聚（3-羟基丁酸-CO-3-羟基戊酸; PHBV）和聚（丁二烯酸酯; PBS）是生物降解的，但没有满足就绪的生物降解性标准。因为典型的测试浓度被认为对生物降解和生物降解百分比的生物降解和计算具有负面影响，所以使用较低浓度可能导致pHB，PHBV和PBS满足准备好的生物降解性标准。聚（D，L-丙交酯; PLA）未生物降解。 PBS和PBSA的生物降解应注意，取决于使用的接种和/或粒度。对于除PLA之外的7个塑料，第60天的生物降解百分比大于第28天的百分比，表明测试期更长的测试期可用于评估塑料的环境持久性。在第60天未生物降解的测试中，在第90天没有观察到明显的生物降解。环境毒素Chem 2021; 00：1-7。 （c）2021 Setac

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