引用本文:
李梅, 裴建川, 付勇, 郭晓丽. 表面活性剂对二氧化钛纳米颗粒和锌离子复合细菌毒性的影响[J]. 环境化学, 2018, 37(12): 2730-2739
LI Mei, PEI Jianchuan, FU Yong, GUO Xiaoli. Effect of surfactants on the combined toxicity of TiO2 nanoparticles and zinc ions[J]. Environmental Chemistry, 2018, 37(12): 2730-2739

表面活性剂对二氧化钛纳米颗粒和锌离子复合细菌毒性的影响
李梅, 裴建川, 付勇, 郭晓丽
浙江农林大学环境与资源学院, 杭州, 311300
摘要:
纳米颗粒和重金属的复合生态毒性已受到广泛关注.作为水体中的常见污染物,表面活性剂可能会影响纳米颗粒和重金属的复合毒性.本文选取常见的阴离子表面活性剂十二烷基苯磺酸钠(SDBS)和非离子表面活性剂Tween 80,以Zn2+为重金属代表,通过细菌毒性实验研究表面活性剂对nano-TiO2和Zn2+对大肠杆菌复合毒性的影响,通过纳米颗粒性质表征、颗粒沉降实验、吸附实验、细菌细胞外膜渗透性测定等揭示毒性影响机制.研究表明,nano-TiO2通过吸附Zn2+降低了Zn2+在介质中的溶解浓度,两者复合毒性小于其叠加毒性;SDBS和Zn2+作用后降低了Zn2+自身的生物可利用性,同时增强了细胞外膜渗透性.当SDBS浓度大于50 mg·L-1,Zn2+浓度大于4 mg·L-1时,两者复合毒性表现为协同效应.3种污染物共存时,nano-TiO2的存在降低了Zn2+和SDBS的复合毒性.Tween 80对nano-TiO2和Zn2+的单独毒性及复合毒性影响均不明显.本研究结果可为表面活性剂存在下纳米颗粒和重金属对细菌或其它生物的复合毒性评价提供理论依据.
关键词:    表面活性剂    二氧化钛纳米颗粒    重金属    复合毒性   
Effect of surfactants on the combined toxicity of TiO2 nanoparticles and zinc ions
LI Mei, PEI Jianchuan, FU Yong, GUO Xiaoli
School of Environmental and Resource, Zhejiang A & F University, Hangzhou, 311300, China
Abstract:
The combined toxicity of nanoparticles and heavy metals has attracted more attention. As common pollutants in polluted waters, surfactants could impact the combined toxicity of nano-particles and heavy metals. In this study, sodium dodecylbenzene sulfonat(SDBS)and Tween 80 as widely used surfactants, Zn2+ as a representative heavy metal, were selected, and the toxicity tests were conducted to investigate the effect of surfactants on the combined toxicity of nano-TiO2 and Zn2+. The underlying toxicity mechanism was revealed by multiple experiments such as characterization of nano-TiO2, cell outer membrane permeability, the settling of nano-TiO2, adsorption tests. Nano-TiO2 reduced the toxicity of Zn2+ by its adsorption of Zn2+, and their combined toxicity was lower than their additive toxicity. The reaction of SDBS and Zn2+ resulted in the reduction of zinc bioavailability and the increase of cell outer membrane permeability. When SDBS was greater than 50 mg·L-1 and Zn2+ was higher than 4 mg·L-1, the combined toxicity of SDBS and Zn2+ showed synergistic effect. In the presence of nano-TiO2, their combined toxicity was reduced by nano-TiO2. The effect of Tween 80 on the individual or combined toxicity of nano-TiO2 and Zn2+ was not obvious. Our results could provide some valuable information for the ecological risk evaluation of the multiple contamination system such as surfactants, nanoparticles, and heavy metals.
Key words:    surfactant    TiO2 nanoparticles    heavy metal    combined toxicity   
收稿日期: 2018-05-09
基金项目: 浙江省自然科学基金(LQ14B070007)和国家自然科学基金(21607132)资助.
李梅,Tel:0571-63920771,E-mail:limei@zafu.edu.cn
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