Effects of Different Charged Polystyrene Nanoplastics on Growth and Photosynthetic Activity of Nannochloropsis Oceanica
This study aimed to evaluate effects of 30 nm anionic carboxyl-modified(—COOH)and 100 nm cationic amino-modified(—NH2)polystyrene(PS)NPs at different concentrations(PS-COOH:0,2,5,8 and 10 mg·L-1;PS-NH2:0,0.2,0.3,0.4 and 0.5 mg·L-1)on the growth and photosynthetic activity of the marine microalga N.oceanica.The results showed that the two NPs aggregated and the absolute value of potential de-creased in the medium;PS modified with carboxyl group had no obvious effect on the growth and photocombination of N.oceanica,while PS modified with amino groups in different Dif-ferent concentrations have different effects on the growth and photosynthesis of N.oceani-ca:low concentrations(0.2 mg·L-1)PS-NH2 can promote the growth of N.oceanica,high concentrations(0.4,0.5 mg·L-1)PS-NH2 can inhibit the growth of N.oceanica,N.oceanica at different concentrations of PS-Under NH2 stress,it showed the phenomenon of low promotion and high inhibition;and when N.oceanica was exposed to 0.2 mg·L-1 PS-NH2,the content of chlorophyll a(Chl a)was higher than that of the control group,while the other treatment groups were lower than the control group.In addition,the Fv/Fm value of N.oceanica under 0.2 mg·L-1 PS-NH2 treatment was always higher than that of the control group,while under 0.5 mg·L-1 high concentration PS-NH2 stress,the maxi-mum photochemical value of N.oceanica Efficiency was consistently lower than in the con-trol group,and these results were consistent with the growth data.
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