横断山区河谷云南松中全氟化合物的历史反演及赋存特征  

Historical inversion and occurrence of perfluoroalkyl substances in Pinus yunnanensis in Valley of Transverse Mountain Area

作　　者：陈朝辉 孙炼 何利君 夏开鑫 温祥洁 刘伟[1] 孙静[1] 印红玲[1] 方淑红[1] CHEN Zhaohui;SUN Lian;HE Lijun;XIA Kaixin;WEN Xiangjie;LIU Wei;SUN Jing;YIN Hongling;FANG Shuhong(College of Resources and Environment,Chengdu University of Information Technology,Chengdu,610225,China;School of Geography and Tourism,Anhui Normal University,Wuhu,241002,China)

机构地区：[1]成都信息工程大学资源环境学院,成都610225 [2]安徽师范大学地理与旅游学院,芜湖241002

出　　处：《环境化学》2023年第6期1867-1875,共9页Environmental Chemistry

基　　金：国家自然科学基金(21607018);四川省科技计划项目(2021YJ0384);大学生创新创业训练项目(202110621067)资助.

摘　　要：为研究森林树木对全氟化合物(PFASs)污染的历史变化及积累,采集了横断山区河谷云南松(Pinus yunnanensis)年轮,采用超高效液相色谱-质谱联用仪分析了树木年轮中12种PFASs的浓度水平.分析结果表明,年轮中共有6种PFASs检出,ΣPFASs浓度范围为nd—75.7 ng·g^(-1),其中检出率最高的物质是PFOA(91.8%)和PFPeA(89.8%).以PFOA、PFPeA、PFUnDA和PFHxA为主要标志物的2个主成分可以解释该地区年轮中84.4%的PFASs来源,主要来源于PFASs及其前体物的大气长距离迁移.年轮中PFPeA含量随时间变化不符合其生产使用历史,主要受前体物的生物转化和光化学转化影响.单位面积内云南松树干的积累量在高低海拔分别为91.3 g·km^(-2)和22.6 g·km^(-2),说明云南松已成为PFASs在环境中的重要蓄积库之一,今后应进一步加强对横断山区和高海拔地区森林树木的研究,为环境中PFASs的管控提供基础数据.In order to study the historical change and accumulation of perfluoroalkyl substances in forest trees,twelve PFASs in Pinus yunnanensis’s tree rings collected in Valley of Transverse mountain area were analyzed by ultra-performance liquid chromatography-mass spectrometry(UPLC-MS/MS).The results showed that only six PFASs were detected in the tree rings,andΣPFASs concentrations ranged in nd—75.7 ng·g^(-1),with the greatest detection frequency found in PFOA(91.8%)and PFPeA(89.8%).Two principal components with the main markers of PFOA,PFPeA,PFUnDA and PFHxA could explain 84.4%of the sources of PFASs in the growth rings in this region,which mainly came from the long-distance atmospheric migration of PFASs and their precursors.The temporal distribution of PFPeA concentrations in tree rings was not consistent with its production and use history,which was mainly affected by the biotransformation and photochemical transformation of its precursors.The accumulation of Pinus yunnanensis trunk per unit area were 91.3 g·km^(-2)and 23.3 g·km^(-2)at high and low altitudes,respectively,indicating that Pinus yunnanensis has become one of important reservoirs of perfluoroalkyl substances in the environment.Future research on the Transverse mountain area and high altitude areas should be carried out to provide basic data for the control of perfluoroalkyl substances in forest vegetation.

关 键 词：全氟化合物(PFASs) 横断山区河谷 云南松 历史反演 赋存 

分 类 号：X173[环境科学与工程—环境科学]