Tam N F, Ke L, Wang X H, Wong Y S
Department of Biology and Chemistry, Centre of Coastal Pollution and Conservation, City University of Hong Kong, Kowloon.
Environ Pollut. 2001;114(2):255-63. doi: 10.1016/s0269-7491(00)00212-8.
The concentrations of total polycyclic aromatic hydrocarbons (sigmaPAHs) and 15 individual PAH compounds in 20 surface sediments collected from four mangrove swamps in Hong Kong were analysed. sigmaPAH concentrations ranged from 356 to 11,098 ng g(-1) dry weight with mean and median values of 1992 and 1,142 ng g(-1), respectively. These values were significantly higher than those of marine bottom sediments of Hong Kong harbours, suggesting that more PAHs were accumulated in mangrove surface sediments. The concentrations of sigmaPAHs as well as individual PAH compound varied significantly among mangrove swamps. The swamps heavily polluted by livestock and industrial sewage, such as Ho Chung and Mai Po, had much higher concentrations of total PAHs and individual PAH than the other swamps. The PAH profiles were similar among four mangrove swamps, and were dominated by naphthalene (two-ring PAH), fluorene and phenanthrene (three-ring PAH). The mangrove sediments had higher percentages of low-molecular-weight PAHs. These indicated that PAHs in mangrove sediments might originate from oil or sewage contamination (petrogenic input). Ratio values of specific PAH compounds such as phenanthrene/anthracene and fluoranthene/ pyrene, were calculated to evaluate the possible source of PAH contamination in mangrove sediments. These ratios varied among samples, suggesting that mangrove sediments might have a mixed pattern of pyrolytic and petrogenic inputs of PAHs. Sediments collected from Ho Chung mangrove swamp appeared to be more dominated by pyrolytic input while those from Tolo showed strong petrogenic contamination.
对从香港四个红树林沼泽采集的20份表层沉积物中总多环芳烃（ΣPAHs）和15种单个多环芳烃化合物的浓度进行了分析。ΣPAH浓度范围为356至11,098 ng g⁻¹干重，平均值和中值分别为1992和1,142 ng g⁻¹。这些值显著高于香港港口的海洋底部沉积物，表明更多的多环芳烃积累在红树林表层沉积物中。ΣPAHs以及单个多环芳烃化合物的浓度在不同的红树林沼泽之间有显著差异。受牲畜和工业污水严重污染的沼泽，如蚝涌和米埔，其总多环芳烃和单个多环芳烃的浓度比其他沼泽高得多。四个红树林沼泽的多环芳烃谱相似，以萘（二环多环芳烃）、芴和菲（三环多环芳烃）为主。红树林沉积物中低分子量多环芳烃的百分比更高。这些表明红树林沉积物中的多环芳烃可能源自石油或污水污染（成岩输入）。计算了菲/蒽和荧蒽/芘等特定多环芳烃化合物的比值，以评估红树林沉积物中多环芳烃污染的可能来源。这些比值在不同样品中有所不同，表明红树林沉积物可能具有多环芳烃热解和成岩输入的混合模式。从蚝涌红树林沼泽采集的沉积物似乎更多地受热解输入的影响，而吐露港的沉积物则显示出强烈的成岩污染。
