二氧化钛纳米颗粒对亚砷酸盐形态及生物有效性的影响。
Influence of titanium dioxide nanoparticles on speciation and bioavailability of arsenite.
作者信息
Sun Hongwen, Zhang Xuezhi, Zhang Zhiyan, Chen Yongsheng, Crittenden John C
机构信息
Key Laboratory of Pollution Processes and Environmental Criteria of Ministry of Education, College of Environmental Science and Engineering, Nankai University, Tianjin, China.
出版信息
Environ Pollut. 2009 Apr;157(4):1165-70. doi: 10.1016/j.envpol.2008.08.022. Epub 2008 Oct 30.
In this study, the influence of the co-existence of TiO(2) nanoparticles on the speciation of arsenite [As(III)] was studied by observing its adsorption and valence changing. Moreover, the influence of TiO(2) nanoparticles on the bioavailability of As(III) was examined by bioaccumulation test using carp (Cyprinus carpio). The results showed that TiO(2) nanoparticles have a significant adsorption capacity for As (III). Equilibrium was established within 30 min, with about 30% of the initial As (III) being adsorbed onto TiO(2) nanoparticles. Most of aqueous As (III) was oxidized to As(V) in the presence of TiO(2) nanoparticles under sunlight. The carp accumulated considerably more As in the presence of TiO(2) nanoparticles than in the absence of TiO(2) nanoparticles, and after 25-day exposure, As concentration in carp increased by 44%. Accumulation of As in viscera, gills and muscle of the carp was significantly enhanced by the presence of TiO(2) nanoparticles.
在本研究中，通过观察TiO₂纳米颗粒共存对亚砷酸盐[As(III)]形态的影响，研究了其吸附和价态变化。此外，使用鲤鱼（Cyprinus carpio）通过生物累积试验研究了TiO₂纳米颗粒对As(III)生物有效性的影响。结果表明，TiO₂纳米颗粒对As(III)具有显著的吸附能力。在30分钟内达到平衡，约30%的初始As(III)被吸附到TiO₂纳米颗粒上。在阳光照射下，在TiO₂纳米颗粒存在的情况下，大多数水中的As(III)被氧化为As(V)。与不存在TiO₂纳米颗粒相比，鲤鱼在存在TiO₂纳米颗粒时积累的As要多得多，并且在暴露25天后，鲤鱼体内的As浓度增加了44%。TiO₂纳米颗粒的存在显著增强了As在鲤鱼内脏、鳃和肌肉中的积累。
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