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纳米二氧化钛对三价砷在大型蚤中累积与毒性的影响
王振红,李金丽,严雅萌,樊荣建,罗专溪,等
作者单位E-mail
王振红 闽南师范大学化学与环境学院 zhhwang1979@163.com 
李金丽 中国科学院城市环境研究所城市环境与健康重点实验室  
严雅萌 中国科学院城市环境研究所城市环境与健康重点实验室  
樊荣建 重庆市永晟环保工程有限公司  
罗专溪 中国科学院城市环境研究所城市环境与健康重点实验室 zxluo@iue.ac.cn 
摘要:
nTiO2 (纳米二氧化钛)可作为其吸附污染物的运输载体而影响污染物在生物体内的累积与毒性. 为明晰nTiO2 (纳米二氧化钛)吸附As(III)(三价砷)后作为As的运输载体对水生物体内As累积与毒性的影响,以大型蚤(Daphnia magna)为受试生物,通过室内培养实验,研究了不同nTiO2浓度、As(Ⅲ)不同暴露水平相互作用下蚤体中As与Ti的累积量、毒性及其潜在作用机制. 结果表明,nTiO2可在30 min内吸附As(III )至平衡,其中2、20 mg/L nTiO2对75 μg/L As(III)的吸附率分别可达31.38%、51.84%,蚤体内As的累积量分别为对照组的2.9和3.8倍,表明nTiO2可作为运输载体提高As(III)在大型蚤体内的累积;但不同砷暴露水平下蚤体As和Ti含量的相关关系表明nTiO2作为载体的运输作用可能会因As暴露水平的增加而减弱. 另外,nTiO2虽然作为运输载体提高了As(III)在大型蚤中的累积,但并未增加As(III)对大型蚤的毒性.添加2、20 mg/L nTiO2后,As(III)对大型蚤的24h IC50分别从0.93 mg/L增至2.53和2.97 mg/L,表明nTiO2减少了As(III)对大型蚤的毒性. 研究结果发现nTiO2虽增加了As(III)在大型蚤中的累积,但却降低了As(III)对大型蚤的毒性,这可进一步促进nTiO2与其复合的重金属污染风险的认识.
关键词:    纳米材料  吸附  毒性  累积
DOI:
分类号:X
基金项目:
Influence of Nano-TiO2 on Accumulation and Toxicity of Arsenite in Daphnia magna
luo zhuanxi,et al
Abstract:
Titanium dioxide nanoparticles (nTiO2) have a higher capacity to adsorb contaminants, which in turn affects the biological accumulation and toxicity. To examine the toxicity and accumulation of arsenite [As(III)] in Daphnia magna in the presence of nTiO2 as transport carriers, the IC50 (Half Inhibitory Concentration), and As and Ti (titanium) accumulated levels were determined for different As concentrations (75 μg/L and IC50 ) in absence and presence of nTiO2 at 2 and 20 mg/L. Results showed that nTiO2 can adsorb As(III) to be balanced after 30 min. Specifically, the adsorption rate of As(III) was 31.38% and 51.84%, respectively at 2 and 20 mg/L nTiO2, and the amount of accumulated arsenic in D. magna was 2.9 and 3.8 times the amount accumulated in the control (without nTiO2). This indicated that nTiO2 could function as carrier and enhance the accumulation of As(III) in D. magna. Meanwhile, the amount of accumulated arsenic in D. magna transported by nTiO2 might decreased with increasing exposed As(III) levels. This observation is supported by the relationship between arsenic and titanium in D. magna for different As exposed levels. Furthermore, in spite of the increasing arsenic accumulation in D. magna with the nTiO2 concentration, the toxicity of As(III) did not increase. Specifically, the 24 h IC50 of As(III) increased from 0.93 mg/L in absence of nTiO2 to 2.53 and 2.97 mg/L at 2 and 20 mg/L of nTiO2, respectively, demonstrating that nTiO2 decreased the toxicity of As(III) on D. magna. The study concluded that nTiO2 can enhance the accumulation of As(III) in D. magna, but reduced its toxicity, which will be helpful of providing insights into ecological risks of combined pollution of nTiO2 and heavy metals.
Key words:  arsenic  nanomaterials  adsorption  toxicity  accumulation