The Effects of Nano-SiO₂ and Nano-ZnO on the Concentration of Chlorophyll-a in Seawater

Abstract:

Effects of nano-SiO₂ and nano-ZnO on the concentration of chlorophyll-a in seawater were studied. Different particle size of nano-SiO₂ and nano-ZnO (10~500nm) were added into seawater with different content ranging between 5~100mg/L, led to the v (growth rate) of chlorophyll-a were -11.4~-44.8% and -39.6~-74.0% respectively, and v decreased with the increasing of the concentration of nanoparticles and raised with the increasing of the nanoparticles size, and nano-ZnO had the stronger inhibitory effect than nano-SiO₂. While to nano-ZnO and Zn²⁺(concentrations of zinc were 0.05~1.00mmol/L), chlorophyll-a growth rate decreased as the concentration of zinc increased and the average growth rates were -60.2～-68.8%, meant that nano-ZnO and Zn²⁺ have the same toxical mechanism. Concentrations of Zn²⁺ released from nano-ZnO (30nm and 90nm) with content of 5~100mg/L were 1.56~4.29mg/L, and rose with the increasing of nano-ZnO concentration, and 30nmZnO released more Zn²⁺ than 90nm. To nano-ZnO, percentage of the concentration of Zn²⁺ released by it and its v values have linear correlation, indicated that the released Zn²⁺ is the main reason for toxicity of nano-ZnO.

• Periodical: Advanced Materials Research (Volumes 864-867)
• Pages: 11-16
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.864-867.11
• Online since: December 2013
• Authors: Xiao Mei Wu, Chun Yu Ma, Ai Rong Zheng*
• Keywords: Chlorophyll-a, Inhibitory Effect of Growth, Nano-SiO₂ and Nano-ZnO

References

[1] J. Li. The toxic mechanism of CuO nanoparticles to microcystis aeruginosa as affected by dissolved organic matter. master thesis of Ocean University of China, 2010. In Chinese.

[2] Ma M, Zhu W, Wang Z, et al. Aquatic Toxicology, 2003, 63(3): 221-228.

[3] Wiench K, Wohlleben W, Hisgen V, et al. Chemosphere, 2009, 76(10): 1356-1365.

[4] X. S. Zhu, L. Zhu, S. Y. Tian, et al. Acta Ecologica Sinica, 2008, 28(8): 3507-3516. In Chinese.

[5] Franklin N M, Rogers N J, Apte S C, et al. Environmental science & technology, 2007, 41(24): 8484-8490.

[6] Heinlaan M, Ivask A, Blinova I, et al. Chemosphere, 2008, 71(7): 1308-1316.

[7] C. H. Zhu. Shanghai Measurement and Testing, 2004, 31(2): 16-17. In Chinese.

[8] B. Wang, W. Y. Feng, Y. L. Zhao, et al. Science in China(Series B), 2005, 35(1): 1-10. In Chinese.

[9] Warheit D B, Webb T R, Sayes C M, et al. Toxicological Sciences, 2006, 91(1): 227-236.

[10] W. Y. Feng, H. F. Wang, et al. Biological effects and safety application of silicon dioxide and zinc oxide nano materials. Science Press, 2010. In Chinese.

[11] Peng X, Palma S, Fisher N S, et al. Aquatic Toxicology, 2011, 102(3): 186-196.

[12] C. E. Qiu, Y. H. Bi, Z. Y. Hu. Acta Hydrobiologica Sinica, 2007, 31(4): 503-508. In Chinese.