| 引用本文: | 秦宁,朱樱,吴文婧,王军军,王雁,何玘霜,何伟,徐福留.多环芳烃在小白洋淀挺水植物中的分布、组成及其影响因素.湖泊科学,2010,22(1):49-56. DOI:10.18307/2010.0107 |
| QIN Ning,ZHU Ying,WU Wenjing,WANG Junjun,WANG Yan,HE Qishuang,HE Wei,XU Fuliu.The distributions,composition and their determining factors of polycyclic aromatic hydro-carbons in emergent macrophytes in Small Baiyangdian Lake. J. Lake Sci.2010,22(1):49-56. DOI:10.18307/2010.0107 |
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| 多环芳烃在小白洋淀挺水植物中的分布、组成及其影响因素 |
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秦宁, 朱樱, 吴文婧, 王军军, 王雁, 何玘霜, 何伟, 徐福留
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北京大学城市与环境学院, 地表过程分析与模拟教育部重点实验室, 北京 100871
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| 摘要: |
| 利用GC-MS测定了端村小白洋淀5个采样点三种主要挺水植物（荷花、蒲草和芦苇）中16种优控多环芳烃（PAHs）的含量,分析了其分布与组成特征及其影响因素。结果表明:（1）16种优控多环芳烃总量(PAH16)在三种挺水植物中的平均干重含量范围为82.5-448.6ng/g（dw）,七种挺水植物组织荷叶、荷茎、蒲叶、蒲茎、蒲根、苇叶与苇根中PAH16的平均干重含量分别为448.6ng/g（dw）、129.3ng/g（dw）、292.6ng/g（dw）、166.8ng/g（dw）、82.5ng/g（dw）、141.5ng/g（dw）和90.0ng/g（dw）,这些数据表明同种植物的叶中PAHs含量最高、茎中次之、根中最低;PAHs各组份在七种挺水植物中的含量具有显著的正相关关系,反映了PAHs在植物组织中的分布模式极为相似.（2）七种挺水植物组织中,均以低环PAHs为主,中环PAHs次之,高环PAHs很低,其百分比范围分别为66.2%（荷叶）-89%（蒲茎）、10.2%（蒲茎）-32.6%（荷叶）和0.6%（蒲叶）-3.7%（苇根）;菲、荧蒽、萘、芴、芘和屈6种PAHs组分在挺水植物组织中的平均百分含量较高,分别为35.3%、15.5%、12.1%、11.7%、9.2%和5.2%,占PAH16的89%.3)PAHs在挺水植物中的含量与植物含脂率具有显著的正相关关系,与PAHs组分的辛醇-水分配系数(Kow)以及辛醇-大气分配系数(Koa)具有显著的负相关关系. |
| 关键词: 小白洋淀 挺水植物 多环芳烃 分布 组成 影响因素 |
| DOI：10.18307/2010.0107 |
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| 基金项目:国家杰出青年基金项目(40725004);国家自然科学基金项目(40671165);国家重点基础研究发展计划(973)项目(2007CB407304,2006CB403304)联合资助 |
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| The distributions,composition and their determining factors of polycyclic aromatic hydro-carbons in emergent macrophytes in Small Baiyangdian Lake |
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QIN Ning, ZHU Ying, WU Wenjing, WANG Junjun, WANG Yan, HE Qishuang, HE Wei, XU Fuliu
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College of Urban Environmental Sciences,MOE Laboratory for Earth Surface Process,Peking University,Beijing 100871, P.R.China
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| Abstract: |
| The contents of 16 priority polycyclic aromatic hydrocarbons(PAHs) in the seven tissues of three species emergent mac-rophytes from five sampling sites in Small Baiyangdian Lake nearby Duancun Village were measured by GC-MS. The PAHs distri-button, composition, and their determining factors were analyzed. The following results were obtained;(1)the total dry-weightcontents of 16 priority PAHs(PAH16)ranges From 82.5 to 448.6ng/g(dw),with the average contents of 448.6ng/g(dw) in lotusleaves, 129.3 ng/g(dw) in lotus stems,292.6ng/g(dw) in cattailleaves,166.8ng/g(dw) in cattail stem, 82.5ng/g(dw) in cat-tail mots,141.Sng/g(dw) in reed leaves and 90. Ong/g(dw) in reed roots. This shows that highest contents are in leaves, followedby stems and roots. The significant positive relations among the contents of PAHsc:ongeners in seven macrophytes tissues are o6-served, implying the very similar PAHs distribution patterns among seven tissues. (2)Of 16 priority PAHs, lower molecular weightPAHs are dominant with the percentages varying from 66. 2%(in lotus leaves) to 89%(in cattail stems),while the percentagesof moderate and higher molecular weight PAHs range from 10.2%(in cattail stem,) to 32.6%(in lotus leaves) and from 0.60/(in cattail leaves) to 3.70/(in reed roots).Six PAH congeners including phenanthrenr(Phe),fluoranthene(Fla),naphtha-lene(Nap),fluorine(Flo),pyrene(Pyr) and chrysene(Chr) are dominant components with average percentages of 35.3%,15.5%,12.1%,11.70%, 9.2% and 5.2%, standing for 89% of total 16 priority PAHs(P.AH16).3)PAHs contents in emergentmacrophytes are observed to be significant positive relations with their lipid percentages, and to be significant negative relations with the octanol-water partition coefficient (Kowand octanol-air partition coefficient(Kow)of PAH congeners. |
| Key words: Small Baiyangdian Lake emergent macrophytes PAHs distribution composition determining factors |
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