泽泻(Alisma orientale)对全氟化合物的吸收和传输特征-浓度的影响
Concentration-dependent Accumulation and Translocation of PFASs by Wetland Plant Alisma orientale
查看参考文献30篇
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文摘
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为探究泽泻(Alisma orientale)对不同浓度全氟化合物(PFASs)的吸收、积累和传输特征,进行了为期3周的水培实验,全氟辛酸和全氟辛烷磺酸的暴露浓度分别为0、5、10、50、100、200、500和1 000 μg·L ~(- 1).结果表明:随着PFASs浓度的增加,根系电导率、根茎中Cu含量、茎叶中Ca含量均降低,但泽泻生长状况良好;植物对PFASs的去除量不断增加(0.87 ~ 116.50 μg), 去除率却不断降低(20.1 %~ 2.9%).根、茎和叶中PFASs的浓度随着PFASs浓度的增加呈线性增加,且符合Langmuir吸附等温式和Michaelis-menten方程,表明泽泻通过被动扩散的方式吸收PFASs.计算PFOA和PFOS的根、茎和蒸腾流富集系数(RCF、SCF、TSCF), 并用限制分配模型对RCF和SCF值进行拟合,发现RCF、SCF、TSCF和限制分配模型准平衡分配系数αpt均随着PFASs浓度的增加而降低,这是由于随着PFASs浓度的增加,达到平衡所需要的水分量增加,达到平衡的时间也变长. |
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其他语种文摘
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This study investigated the concentration-dependent accumulation and translocation of perfluoroalkyl substances (PFASs) by wetland plant Alisma orientale. The concentrations of PFASs in nutrient solution were 0,5,10,50,100,200,500,and 1000 μg·L ~(- 1). The electrolytic leakage of roots,Cu concentration in roots and stems,and Ca concentration in stems and leaves decreased with an increase in PFASs concentration in external solution,while the plants were growing well. The removal mass of PFASs by plants increased (0.87-116.50 μg) with an increase in PFASs concentration,while the removal efficiency decreased (20.1%-2.9%). The PFASs concentration in plant roots,stems,and leaves increased linearly with that in nutrient solution,and fitted the Langmuir adsorption isotherm and Michaelis-Menten equation well,which indicated PFASs were uptaken through passive diffusion. The root concentration factor,stem concentration factor,transpiration stream concentration factor,and partition limited quasi-equilibrium factor αpt decreased with that of PFASs in nutrient solution,probably due to the increase in the volume of transpiration water and the longer time to reach equilibrium. |
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来源
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环境科学
,2019,40(12):5394-5400 【核心库】
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DOI
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10.13227/j.hjkx.201906060
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关键词
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全氟化合物(PFASs)
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湿地植物
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泽泻
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限制分配模型
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被动扩散
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地址
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1.
中国科学院广州地球化学研究所, 有机地球化学国家重点实验室, 广州, 510640
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华南师范大学环境研究院, 环境理论化学教育部重点实验室, 广州, 510631
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中国科学院大学, 北京, 100049
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暨南大学生态学系,水生生物研究中心, 广州, 510632
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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0250-3301 |
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学科
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环境科学基础理论 |
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基金
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国家自然科学基金-广东联合基金
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全国大学生创新创业大赛项目
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文献收藏号
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CSCD:6624131
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