蕨类植物对全氟羧酸烷基化合物的生物富集特性  

Bioaccumulation characteristics of perfluorocarboxylic alkyl compounds by ferns

作　　者：卢虹颖 钱深华 智悦[1] 李正委 颜正 李浩然 陆歆怡 LU Hong-ying;QIAN Shen-hua;ZHI Yue;LI Zheng-wei;YAN Zheng;LI Hao-ran;LU Xin-yi(Key Laboratory of the Three Gorges Reservoir Region’s Eco-Environment,Ministry of Education,Chongqing University,Chongqing 400045,China)

机构地区：[1]重庆大学三峡库区生态环境教育部重点实验室,重庆400045

出　　处：《中国环境科学》2023年第5期2440-2449,共10页China Environmental Science

基　　金：国家自然科学基金资助项目(52200225,U20A20326);中国博士后科学基金资助项目(2021M693723);中央高校基金资助项目(2021CDJXKJC005)。

摘　　要：选择了5种典型蕨类植物开展温室暴露实验,测定了植物对代表性全氟烷基羧酸(PFCA)的生物富集特征:包括PFCA在植物组织中的浓度和质量分布、生物累积系数,并与部分农作物以及湿地植物进行了比较.结果表明:蕨类植物对5种PFCA均有可观的生物富集,地上平均生物积累因子均值(BCF)介于4.6~12.9,地下部分BCF均值介于1.2~6.1.其中刺齿贯众(Cyrtomium caryotideum)对PFCA的富集效果最佳,单株可以富集60μg的ΣPFCA,地上部分生物积累因子(BCF)最高可达25.7(全氟戊酸PFPeA),地下部分生物积累因子(BCF)最高可达12.3(全氟辛酸PFOA).除此之外,刺齿贯众对复杂环境适应性良好、生长速度快、生物量大,是潜在的针对PFAS污染场地植物修复优势物种.除此之外,本文结果显示PFAS被植物富集之后,短链物质(如全氟丁酸PFBA,C3)更容易向上转移累积在植物茎叶中,而长链物质(如PFOA,C7)更易被富集在根部.In this paper,greenhouse exposure experiments with five fern species were conducted to investigate the bioaccumulation characteristics of representative perfluoroalkyl carboxylic acids(PFCA)in plants.Specifically,the concentration,mass distribution,and bioaccumulation coefficient of PFCA in plant tissues were explored.Our results showed significant bioaccumulation of five PFCA in ferns,with an average bioaccumulation factor(BCF)of shoot ranging from 4.6~12.9,and an average BCF of root ranging from 1.2~6.1.Among the species tested,Cyrtomium caryotideum(Cc)exhibited the highest bioaccumulation potential for PFCA,with an individual plant being capable of uptaking 60μg ofΣPFCA.The BCF of the shoot Cc can reach up to 25.7(for PFPeA),while the BCF of the root can reach up to 12.3(for PFOA).Cyrtomium caryotideum is a promising species for phytoremediation of PFAS-contaminated sites due to its adaptability,fast growth,and large biomass.We also found that short-chain PFCA,such as perfluorobutanoic acid(PFBA,C3),are more likely to transfer upwards and accumulate in plant stems and leaves,while long-chain substances,such as PFOA(C7),are more likely to retain in roots.

关 键 词：全(多)氟类化合物 全氟烷基化合物 全氟烷基羧酸 植物 转运 富集 

分 类 号：X173[环境科学与工程—环境科学]