摘要
The migration and dissolution of AgNPs in an aquatic system with plants was investigated.By using a hydroponic system with Eichhornia crassipes,the absorption and transportation processes of silver nanoparticles were investigated.The results show that AgNPs concentrations in the water phase declined with the increase in time,and the reduction degree was dependent on the initial concentrations of AgNPs.The silver concentrations in the roots(r=0.98,p<0.05),stems and leaves(r=1,p<0.001)were significantly positively correlated with the initial concentrations of AgNPs.Silver nanoparticles accumulated in plant roots more than stems and leaves.Compared with the addition of AgNO 3 at identical concentrations,lower removal rates of silver and plant uptake were observed in the AgNPs stress systems.A significant positive correlation was also found between the initial AgNPs concentrations and the removed amount of silver(r=0.99,p<0.001).For AgNPs,the primary removal mechanisms in these aquatic systems were agglomeration and sedimentation,while the absorption by plants had a relatively weak contribution.
研究了纳米银在水生态系统中的迁移降解.通过凤眼莲水培系统,探究AgNPs在该系统中的吸附和转移过程.结果表明,随着培养时间的增加,水相中AgNPs的浓度下降,并且下降程度与初始投加浓度成正相关.初始投加AgNPs浓度与凤眼莲根系(r=0.98,p<0.05)和茎叶(r=1,p<0.001)中的银浓度显著相关.根系中的银含量高于茎叶.AgNPs处理下,水相中银的去除率和植物吸收量低于相同浓度AgNO3处理组.同时发现,AgNPs的去除量与初始投加浓度成显著正相关(r=0.99,p<0.001).实验结果表明,水培系统中AgNPs的主要去除机理为凝聚和沉积作用,其中植物起到的作用较小.
基金
The National Natural Science Foundation of China(No.51479034,5151101102)
Fundamental Research Funds for the Central Universities(No.2242016R30008)
作者简介
Cao Chong(1991—),male,Ph.D.candidate.;Huang Juan(corresponding author),female,doctor,associate professor,101010942@seu.edu.cn.
