| 李金丽,李梦婷,黄兵,王振红,罗专溪.亚砷酸盐提高藻与蚤培养基下纳米二氧化钛的稳定性[J].农业环境科学学报,2017,36(2):376-381. |
| 亚砷酸盐提高藻与蚤培养基下纳米二氧化钛的稳定性 |
| Arsenite enhance the stability of nano-TiO2 in aquatic culture media for freshwater algae and daphnia |
| 投稿时间：2016-08-11 |
| DOI：10.11654/jaes.2016-1031 |
| 中文关键词: nTiO2 As（Ⅲ） 稳定性 |
| 英文关键词: nTiO2 arsenite stability |
| 基金项目:国家自然科学基金项目（41271484，41401552） |
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| 中文摘要: |
| 进入水环境的纳米二氧化钛（nTiO2）会影响水体中其他污染物的环境行为，进而影响其生态风险，这种影响机制受其在水环境中分散、团聚及沉降等稳定性的影响。为更好地认识和预测淡水环境中nTiO2的生态风险，以超纯水和常见的培养基（绿藻培养基BG11、大型水蚤培养基SM7）作为分散介质，分析了亚砷酸盐[As（Ⅲ）]影响下nTiO2在分散介质中的稳定性。结果表明：nTiO2稳定性与其初始浓度、分散介质离子强度显著负相关；As（Ⅲ）能够影响分散介质的pH值、Zeta电位，从而影响nTiO2的稳定性，nTiO2稳定性与As（Ⅲ）浓度显著正相关。这说明水环境中的As（Ⅲ）能增强nTiO2的稳定性和迁移能力，使绿藻和大型蚤暴露于稳定的nTiO2-As（Ⅲ）体系，增大两者的生态风险。 |
| 英文摘要: |
| Nano-titanium dioxide(nTiO2) has an impact on the behavior of other co-contaminants in the environment, then pose to its ecological risk. To better understand and then to predict the ecological risk of nTiO2 in fresh water, we investigated the stability of nTiO2 under arsenite[As(Ⅲ)] stress in different culture media-ultrapure water, Freshwater Algae and Daphnia Culture Media BG11 and SM7. The results showed that:The stability of nTiO2 significantly negatively related with its initial concentration and ion strength of the disperse medium; Arsenite could influence the pH and Zeta-potential of the medium, thus the stability of nTiO2; The stability significantly positively related with arsenite's concentration, indicating enhanced stability and migration of nTiO2 by arsenite. As a result algae and daphnia were fully exposed to the stable nTiO2-As(Ⅲ) system, and the ecological risk of both spieces increased. |
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