不同湿地植物多环芳烃含量及其对湿地多环芳烃去除量的贡献研究

STUDY ON THE CONTENT OF POLYCYCLIC AROMATIC HYDROCARBONS IN DIFFERENT WETLAND PLANTS AND THEIR CONTRIBUTION TO THE REMOVAL OF POLYCYCLIC AROMATIC HYDROCARBONS IN WETLANDS

利用气相色谱/质谱联用仪测定模拟人工湿地6种不同植物体内16种优先控制多环芳烃(PAHs)含量,分析了植物体内PAHs的组成,且研究了植物脂肪与PAHs含量的相关性及植物去除PAHs的贡献率。结果表明:不同进水方式(间歇和连续进水)同一种植物体内PAHs含量差别不大,同种进水方式不同植物体内PAHs含量存在一定的差异,16种PAHs在6种湿地植物体内干重含量为882.50~1328.33 ng/g(dw)。植物体内PAHs含量以2环、3环和4环为主,占比分别为22.23%~39.20%、24.46%~31.44%和20.88%~30.36%。植物吸收积累PAHs的贡献率为0.59%~2.33%,且植物PAHs与脂肪含量具有明显的相关性。

The contents of 16 kinds of preferentially controlled polycyclic aromatic hydrocarbons(PAHs)in six different plants in simulated constructed wetlands were determined by GC/MS.The composition of PAHs in plants was analyzed,the correlation between plant fat content and PAHs content and the contribution rate of plant removal of PAHs was studied.The results showed that there was little difference in the content of PAHs in the same plant under different influent methods(intermittent and continuous influent),and there were some differences in the content of PAHs in different plants under the same influent method.The dry weight content of 16 kinds of PAHs in six wetland plants was 882.50~1328.33 ng/g(dw).The content of PAHs in plants was mainly 2rings,3rings and 4rings,accounting for 22.23%~39.20%,24.46%~31.44%and 20.88%~30.36%respectively.The contribution rate of plant absorption and accumulation of PAHs was 0.59%~2.33%,and there was a significant correlation between PAHs content and fat content in plants.