| 摘要: |
| 探讨不同质量浓度纳米TiO2(0, 4, 8, 12, 16, 20 mg/L)对海洋生源要素(N, P, Si, Fe)含量及威氏海链藻(Thalassiosira weissflogii)生长的影响。实验结果表明: 随纳米二氧化钛浓度增大, 对海洋生源要素的吸附率有不同程度的提高, 海洋生源要素含量下降, 对磷和铁的影响最为明显; 纳米二氧化钛吸附对氮磷比和硅磷比影响很大, 氮磷比为68~126, 硅磷比为74~135, 而对硅氮比影响很小基本维持在1。纳米二氧化钛对威氏海链藻生长有明显抑制, 并存在剂量—效应关系, 与海洋生源要素含量影响存在相关性。 |
| 关键词: 纳米二氧化钛 海洋生源要素 海洋生态毒理学 硅藻 纳米污染 |
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| 基金项目:国家自然科学基金资助项目(40506020; 20977074;21175115); 教育部新世纪优秀人才支持计划资助项目( 教技函[2011]95号); 福建省杰出青年基金项目(2010J06005) |
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| Influence of nanometer size titanium dioxide on the content of marine biogenic elements and the growth of Thalassiosira weissflogii |
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| Abstract: |
| 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. |
| Key words: nanometer size TiO2 marine biogenic element marine ecological toxicology diatom Nano-pollution |
