聚乳酸微塑料对大型溞的毒性效应

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Abstract In order to further reveal the effects of biodegradable microplastics on aquatic organisms, the acute and chronic toxic effects of polylactic acid (PLA) microplastics on Daphnia magna were studied using Daphnia magna as the model organism. The results showed that the half effect concentration (48h-EC50) of PLA on Daphnia Magna was 59.43mg/L, with a 95% confidence interval of 53.55~65.97mg/L. Additionally, the toxicity of PLA was reduced by ultraviolet irradiation treatment. PLA inhibited the swimming activity and feeding behavior of Daphnia magna in a concentration-dependent manner. Compared with the control group, PLA at 100mg/L significantly inhibited the heart rate and thoracic limb activity of Daphnia magna, with maximum inhibition rates of 31.4% and 17.7%, respectively. After long-term exposure for 21days, both 10 and 40mg/L PLA inhibited the reproduction and intrinsic rate of population growth (r_m) of Daphnia magna to some extent, but the effects were not significant. Exposure to PLA at 40mg/L significantly reduced the survival rate of Daphnia magna (only 20%). PLA exposure significantly induced superoxide dismutase (SOD) activity and malondialdehyde (MDA) content, indicating that Daphnia magna was subjected to oxidative stress and caused lipid peroxidation damage. At the concentration of 40mg/L, PLA significantly inhibited the acetylcholinesterase (AChE) activity, resulting in neurotoxicity and motor disorders of Daphnia magna

Key words： microplastics polylactic acid Daphnia magna toxic effects

Received: 18 January 2023

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X503.2

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	Articles by authors
	LIU JIA-qiang
	JIANG Yuan-yuan
	YANG Yang-yang
	CHENG Hai
	XU Lei
	LIU Qiang
	FAN Xiu-lei

Cite this article:

LIU JIA-qiang,JIANG Yuan-yuan,YANG Yang-yang等. Toxic effects of polylactic acid microplastics to Daphnia magna[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(8): 4343-4352.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I8/4343

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