中国环境科学

作者：徐成龙, 吴培, 陈波, 叶天然, 练建军

单位：安徽工业大学能源与环境学院, 安徽 马鞍山 243002

关键词：生物可降解塑料,铜绿微囊藻,微塑料,毒性效应

基金：国家自然科学基金资助面上项目(52370159);安徽省自然科学基金资助面上项目(2208085ME154);安徽工业大学青年科研基金资助项目(QZ202318)

In this study, polylactic acid (PLA), polybutylene glycol terephthalate (PBAT) in biodegradable plastics (BMPs) and polyethylene (PE) in conventional microplastics (CMPs) were selected as test chemicals, and Microcystis aeruginosa was used as the test organism. By testing indicators such as algal cell density, chlorophyll a (Chl-a), superoxide dismutase (SOD), catalase (CAT), malondialdehyde (MDA), total intracellular soluble protein (TP) and reactive oxygen species (ROS), the effects of different dosages (50, 100, 150 and 200mg/L) and particle size (150, 250 and 500 μm) of PLA, PBAT and PE on the growth, oxidative stress and cell damage of Microcystis aeruginosa were investigated. The results showed that the growth and oxidative stress indexes of algal cells exhibited significant changes with exposure time under the single action of PLA/PBAT/PE. After 96h of exposure, compared with other treatment groups, the inhibition rate of PLA at a dosage of 100mg/L on Microcystis aeruginosa was the highest (16.31%), while the inhibition rate of PE at a particle size of 150 μm was the highest (15.97%). The exposure of PLA and PE significantly increased the contents of ROS, SOD, CAT and MDA in Microcystis aeruginosa, and their acute toxicity differences may be related to the roughness of the microplastic surfaces. PLA, as an aliphatic polyester, was more prone to hydrolysis in aquatic environments than PBAT, and the release potential of secondary microplastic fragments made it more severely acute toxic to algae.

来源：2024年第11期

《中国环境科学》期刊编辑部

查看中国环境科学杂志2024年第11期