不同浓度及不同来源纳米银对伴矿景天生长及重金属吸收的影响研究  

Effects of different concentrations and sources of silver nanoparticles on growth and metal uptake by Sedum plumbizincicola

作　　者：王朝阳[1,2] 马婷婷[3] 周通[2] 李柱[2] 吴龙华[2] 周守标[1] 骆永明[2] 

机构地区：[1]安徽师范大学环境科学与工程学院,安徽芜湖241000 [2]中国科学院南京土壤研究所土壤环境与污染修复重点实验室,南京210008 [3]湖北文理学院汉江研究院,湖北襄阳441053

出　　处：《农业环境科学学报》2017年第2期250-256,共7页Journal of Agro-Environment Science

基　　金：国家自然科学基金项目(41401581;41325003)~~

摘　　要：近年来,随着纳米银(Ag NPs)的广泛应用,环境中银(Ag)浓度迅速增加,污泥中存在的Ag NPs的生态风险和环境危害尤其值得关注。采用温室盆栽法,设置Ag NPs+污泥与单独Ag NPs处理(Ag NPs浓度为0~10 mg·kg^(-1)),研究了不同浓度及不同来源Ag NPs对镉/锌(Cd/Zn)超积累植物伴矿景天生长和Ag、Cd、Zn 3种重金属元素吸收性的影响。结果表明:单独Ag NPs处理在0~10mg·kg^(-1)浓度范围内对伴矿景天生长未产生显著影响,但与单独Ag NPs处理相比,Ag NPs+污泥处理明显抑制了伴矿景天生长,导致其生物量显著下降(P<0.05)。随着土壤中不同来源Ag NPs浓度的增加,伴矿景天地上部Ag浓度未有显著变化,但根中Ag浓度明显升高,最高浓度可达2.07 mg·kg^(-1),根部对Ag的富集系数(0.177~0.330)明显高于地上部(0.001 01~0.004 02);种植伴矿景天后土壤中Cd和Zn浓度未有明显变化,每盆植物地上部带走的Cd和Zn的量分别占供试土壤的2.62%~7.14%和2.39%~7.65%。因此,该研究条件下Ag NPs+污泥处理对伴矿景天生长的抑制作用与污泥施用有关,污泥中Ag NPs或单独添加的Ag NPs均未对伴矿景天的重金属吸收性产生显著影响。The recent gradual increase in the use of silver nanoparticles（Ag NPs）has resulted in a rapid increase in the release of silver（Ag）to the environment and has led to serious environmental risk. A glasshouse pot experiment was conducted in which treatments with and without sewage sludge application were set up with addition of Ag NPs at concentrations ranging from 0 to 10 mg·kg（-1）. The effects of Ag NP addition at different concentrations and from different sources to Sedum plumbizincicola on plant growth and Ag, cadmium（Cd）, and zinc（Zn）uptake from the soil were studied. The results indicate that：Ag NPs treatment alone had no significant effect on the growth of S. plumbizincicola at a concentration range of 0 ～10 mg·kg（-1）, but the application of sewage sludge significantly inhibited the growth and biomass of S.plumbizincicola plants（P〈0.05）; As the Ag NPs concentration increased there was no significant change in Ag concentration in S. plumbizincicola shoots but the concentration in the roots increased markedly with a maximum concentration of 2.07 mg·kg（-1）. The enrichment factor of Ag in the roots（0.177～0.330）was significantly higher than that in the aboveground parts（0.001 01～0.004 02）. Cadmium and Zn concentrations in the soil were not changed significantly after planting of S. plumbizincicola. The amounts of Cd and Zn taken up by potted plants from the test soils were 2.62% ～7.14% and 2.39% ～7.65%, respectively. Irrespective of whether Ag NPs were added directly or mixed with sewage sludge they exerted no significant effect on the uptake of Cd or Zn by S. plumbizincicola.

关 键 词：纳米银 污泥 伴矿景天 镉 锌 

分 类 号：X503.23[环境科学与工程—环境工程]