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-TiO_2 in aquatic culture media for freshwater algae and daphnia

作　　者：李金丽[1,2] 李梦婷[2] 黄兵[1] 王振红[2] 罗专溪[2] 

机构地区：[1]昆明理工大学环境科学与工程学院,昆明650500 [2]中国科学院城市环境研究所环境与健康重点实验室,福建厦门361021

出　　处：《农业环境科学学报》2017年第2期376-381,共6页Journal of Agro-Environment Science

基　　金：国家自然科学基金项目(41271484;41401552)~~

摘　　要：进入水环境的纳米二氧化钛(n Ti O2)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n Ti O2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n Ti O2在分散介质中的稳定性。结果表明:n Ti O2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n Ti O2的稳定性,n Ti O2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n Ti O2的稳定性和迁移能力,使绿藻和大型蚤暴露于稳定的n Ti O2-As(Ⅲ)体系,增大两者的生态风险。Nano-titanium dioxide（nTiO_2）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 nTiO_2 in fresh water, we investigated the stability of nTiO_2 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 nTiO_2 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 nTiO_2; The stability significantly positively related with arsenite＇s concentration, indicating enhanced stability and migration of nTiO_2 by arsenite. As a result algae and daphnia were fully exposed to the stable nTiO_2-As（Ⅲ）system, and the ecological risk of both spieces increased.

关 键 词：nTiO2 As(Ⅲ) 稳定性 

分 类 号：X703[环境科学与工程—环境工程]