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.

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