Polycyclic aromatic hydrocarbons in leaf cuticles and inner tissues of six species of trees in urban Beijing.
Polycyclic aromatic hydrocarbons in leaf cuticles and inner tissues of six species of trees in urban Beijing.
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DOI：
10.1016/j.envpol.2007.02.005
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发表时间：
2008
影响因子：
8.9
通讯作者：
Yilin Wang;Shu Tao;Shu Tao;X. Jiao;R. Coveney;Shaowei Wu;Bao S. Xing
中科院分区：
文献类型：
--
作者：
Yilin Wang;Shu Tao;Shu Tao;X. Jiao;R. Coveney;Shaowei Wu;Bao S. Xing
在北京城市道路和校园附近采集了6种树种的叶片样本，测定了其多环芳烃（PAHs）含量。通过序次提取，将叶片中的多环芳烃划分为叶片角质层和叶片内组织两个部分。路边角质层和内部组织中16种多环芳烃的总浓度分别为69.3±64.6μgg−1（d.w）和1.07±0.2μgg−1(d.w)，校园中分别为57.5±52.6μgg−1和0.716±0.2μgg−1。脂质标准化组织内PAHs变化范围为5.8μgg−1 ~ 15.0μgg−1。叶片角质层与空气颗粒之间、内部组织与气相之间多环芳烃光谱的相似性表明，空气颗粒和气体多环芳烃可能分别是角质层和内部组织中多环芳烃的来源。较重的多环芳烃难以迁移到内部组织可能是另一个原因。
Leaf samples of six tree species were collected along urban roadsides and a campus site in Beijing for measurement of polycyclic aromatic hydrocarbons (PAHs). PAHs in leaves were attributed to two fractions, leaf cuticles and inner leaf tissues, using sequential extraction. Total concentrations of 16 PAHs in the cuticles and the inner tissues were 69.3±64.6μgg−1(d.w.) and 1.07±0.2μgg−1(d.w.) at roadside and 57.5±52.6μgg−1and 0.716±0.2μgg−1on campus, respectively. The lipid-normalized inner tissue PAHs varied from 5.8μgg−1to 15.0μgg−1. Similarities in PAH spectra between leaf cuticles and airborne particles and between the inner tissues and gaseous phase imply that airborne particulates and gaseous PAHs are likely the sources of PAHs for cuticles and the inner tissues, respectively. Difficulty in migration of heavier PAHs into inner tissues could be another reason.