Key Laboratory of Geographic Information Science, Ministry of Education, School of Geographical Sciences, East China Normal University, 500 Dongchuan Road, 200241 Shanghai, China.
Key Laboratory of Geographic Information Science, Ministry of Education, School of Geographical Sciences, East China Normal University, 500 Dongchuan Road, 200241 Shanghai, China.
Chemosphere. 2017 Oct;184:1334-1345. doi: 10.1016/j.chemosphere.2017.06.117. Epub 2017 Jun 28.
The city-scale land use/land cover change derived by urbanization on the fates of PAHs is of great concerns recently. This study evaluated spatiotemporal variations and sources of PAHs from a highly urbanized river sediments in the Huangpu River, Shanghai. Results indicated that the concentrations of PAHs in the sediments varied greatly across locations and seasons. The concentration of ΣPAHs in the dry season were 6 times higher than that in wet season. The mainstream and midstream of the Huangpu River were identified as the hotspots in both dry and wet seasons. However, 4-ring PAH compounds were dominated, contributing 42.41% ± 6.81% and 44.70 ± 7.73% in the dry and wet seasons, respectively. Multivariate statistical and land use analysis suggested that the main sources of PAHs derived from the cultivation, traffic and commercial activities. Buffer radii (<750 m) area with cultivated land, road/street and transportation and commercial and business facilities contributed significantly the PAHs in the sediment of the Huangpu River. Population density was also an important variable regulating the PAHs concentrations less than 750 m in the wet season. Risk assessment results revealed that the PAHs toxicity in the sediments was higher in dry season than in wet season. Overall, severe land use changes caused by rapid urbanization can contribute more amount of PAHs emission and complicated sources of PAHs, thus provide insights into the importance of land use types in indicating PAHs source.
城市尺度的土地利用/土地覆被变化对多环芳烃（PAHs）归宿的影响受到了广泛关注。本研究评估了高度城市化的黄浦江河流沉积物中 PAHs 的时空变化和来源。结果表明，沉积物中 PAHs 的浓度在不同地点和季节差异很大。旱季沉积物中ΣPAHs 的浓度是雨季的 6 倍。黄浦江的干流和中游在旱季和雨季都是热点地区。然而，4 环 PAH 化合物占主导地位，分别占旱季和雨季的 42.41%±6.81%和 44.70%±7.73%。多元统计和土地利用分析表明，PAHs 的主要来源来自农业种植、交通和商业活动。缓冲区半径（<750 m）内的耕地、道路/街道、交通和商业及商业设施对黄浦江沉积物中的 PAHs 贡献显著。人口密度也是一个重要的变量，它调节着 750 m 以内的 PAHs 浓度在雨季的变化。风险评估结果表明，旱季沉积物中 PAHs 的毒性高于雨季。总的来说，快速城市化导致的严重土地利用变化可能会导致更多的 PAHs 排放和更复杂的 PAHs 来源，从而深入了解土地利用类型在指示 PAHs 来源方面的重要性。
