Abstract
There are many studies on the toxic effects of single nanoparticles on microalgae; however, many types of nanoparticles are present in the ocean, and more studies on the combined toxic effects of multiple nanoparticles on microalgae are needed. The single and combined toxic effects of nCu and nSiO2 on Dunaliella salina were investigated through changes in instantaneous fluorescence rate (Ft) and antioxidant parameters during 96-h growth inhibition tests. It was found that the toxic effect of nCu on D. salina was greater than that of nSiO2, and both showed time and were dose-dependent with the greatest growth inhibition at 96 h. A total of 0.5 mg/L nCu somewhat promoted the growth of microalgae, but 4.5 and 5.5 mg/L nCu showed negative growth effects on microalgae. The Ft of D. salina was also inhibited by increasing concentrations of nanoparticles and exposure time. nCu suppressed the synthesis of TP and elevated the MDA content of D. salina, which indicated the lipid peroxidation of algal cells. The activities of SOD and CAT showed a trend of increasing and then decreasing with the increase of nCu concentration, suggesting that the enzyme activity first increased and then decreased. The toxic effect of a high concentration of nCu was reduced after the addition of nSiO2. SEM and EDS images showed that nSiO2 could adsorb nCu in seawater. nSiO2 also adsorbed Cu2+ in the cultures, thus reducing the toxic effect of nCu on D. salina to a certain extent. TEM image was used to observe the morphology of algal cells exposed to nCu.
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This work was financially supported by the National Key Research and Development Program (grant number 2019YFC1407802) and the National Natural Science Foundation of China (grant number 41876078).
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All authors contributed to the study conception and design. Material preparation, data collection, and analysis were performed by Qi Li, Liju Tan, and Jiangtao Wang. The first draft of the manuscript was written by Qi Li, and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Li, Q., Tan, L. & Wang, J. Single and combined toxic effects of nCu and nSiO2 on Dunaliella salina. Environ Sci Pollut Res 31, 30256–30268 (2024). https://doi.org/10.1007/s11356-024-33130-2
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DOI: https://doi.org/10.1007/s11356-024-33130-2