Abstract:To investigate the effects of pristine and aged polystyrene nanoplastics (PSNPs) on the growth and toxin-producing ability of Microcystina aeruginosa, 50nm aged PSNPs was prepared by UV aging method, and long-term exposure of different concentrations (0.1, 1, 10mg/L) of pristine and aged PSNPs to Microcystina aeruginosa was conducted for 37days. The results showed that cracks appeared on the surface of aged PSNPs, meanwhile the average particle size was reduced, and the carbonyl index increased from 0.023 to 1.055. Both pristine and aged PSNPs would aggregate on the cell surface of Microcystis aeruginosa, in which the exposure of aged PSNPs caused severer cell morphological damage, and triggered dose-related growth and photosynthesis inhibition, oxidative damage and promotion of microcystin (MC-LR) synthesis and release. Compared with the control group, the final density of Microcystis aeruginosa in 10mg/L pristine and aged PSNPs treatments decreased by 26.65% and 45.07%, the highest malondialdehyde (MDA) content was 1.74 and 1.93 times of the control, and the final extracellular MC-LR content was 1.26 and 1.44 times of the control, respectively The relatively higher promotion of extracellular MC-LR content under 10mg/L of aged PSNPs exposure at the end of the experiment was resulted from the increased synthesis of intracellular MC-LR and the damage of cell membrane.
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