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Bioaccumulation characteristics of perfluorocarboxylic alkyl compounds by ferns |
LU Hong-ying, QIAN Shen-hua, ZHI Yue, LI Zheng-wei, YAN Zheng, LI Hao-ran, LU Xin-yi |
1. Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, China |
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Abstract 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 of ΣPFCA. 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.
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Received: 15 September 2022
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