Influence of nanometer size titanium dioxide on the content of marine biogenic elements and the growth of Thalassiosira weissflogii
纳米TiO2 对海洋生源要素含量及威氏海链藻生长的影响

The influences of the concentrations of nanometer size TiO2 (0, 4, 8, 12, 16, 20 mg/L) on the content of marine biogenic elements (N, P, Si, Fe) and the growth of Thalassiosira weissflogii were investigated. The results showed that with the increase of the TiO2 concentration, the contents of marine biogenic elements were all decreased and the adsorption ratios were all increased. The influences of TiO2 addition on the content of P and Fe were more significant than those on N and Si. The TiO2 adsorption significantly affected the N/P and the Si/P ratios, but not much on Si/N ratio. The N/P and Si/P ratios were varied obviously, ranging from 68 to 126, and 74 to 135, respectively, while Si/N ratio was kept at 1. The nanometer size TiO2 could inhibite the growth of T. weissflogii concentration-dependently, which has relationship with the variations of marine biogenic element contents.