Influence of environmental factors on arsenic accumulation and biotransformation using the aquatic plant species Hydrilla verticillata  

作　　者：Yuan Zhao Zhuo Zhen Zhenhong Wang Liqing Zeng Changzhou Yan 

机构地区：[1]Key Laboratory of Urban Environment and Health,Fujian Key Laboratory of Watershed Ecology,Institute of Urban Environment,Chinese Academy of Sciences,Xiamen 361021,China [2]University of Chinese Academy of Sciences,Beijing 100049,China [3]School of Chemistry and Environment,Fujian Province Key Laboratory of Modern Analytical Science and Separation Technology,Minnan Normal University,Zhangzhou 363000,China

出　　处：《Journal of Environmental Sciences》2020年第4期244-252,共9页环境科学学报（英文版）

基　　金：supported by National Natural Science Foundation of China(No.21577138)

摘　　要：Hydrilla verticillata(waterthyme)has been successfully used for phytoremediation in arsenic(As)contaminated water.To evaluate the effects of environmental factors on phytoremediation,this study conducted a series of orthogonal design experiments to determine optimal conditions,including phosphorus(P),nitrogen(N),and arsenate(As(Ⅴ))concentrations and initial pH levels,for As accumulation and biotransformation using this aquatic plant species,while also analyzing As species transformation in culture media after 96-hr exposure.Analysis of variance and the signal-to-noise ratio were used to identify both the effects of these environmental factors and their optimal conditions for this purpose.Results indicated that both N and P significantly impacted accumulation,and N was essential in As species transformation.High N and intermediate P levels were critical to As accumulation and biotransformation by H.verticillata,while high N and low P levels were beneficial to As species transformation in culture media.The highest total arsenic accumulation was(197.2±17.4)μg/g dry weight when As(V)was at level 3(375μg/L),N at level 2(4 mg/L),P at level 1(0.02 mg/L),and pH at level 2(7).Although H.verticillata is highly efficient in removing As(Ⅴ)from aquatic environments,its use could be potentially harmful to both humans and the natural environment due to its release of highly toxic arsenite.For cost-effective and ecofriendly phytoremediation of As-contaminated water,both N and P are helpful in regulating As accumulation and transformation in plants.

关 键 词：PHYTOREMEDIATION Orthogonal design pH Phosphorus Nitrogen 

分 类 号：X52[环境科学与工程—环境工程] X173