Black carbon (BC) in urban and surrounding rural soils of Beijing, China: spatial distribution and relationship with polycyclic aromatic hydrocarbons (PAHs).
Black carbon (BC) in urban and surrounding rural soils of Beijing, China: spatial distribution and relationship with polycyclic aromatic hydrocarbons (PAHs).
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DOI：
10.1016/j.chemosphere.2010.10.017
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发表时间：
2011
期刊：
影响因子：
8.8
通讯作者：
Shaoda Liu;X. Xia;Yawei Zhai;Ran Wang;Ting Liu;Shangwei Zhang
中科院分区：
文献类型：
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作者：
Shaoda Liu;X. Xia;Yawei Zhai;Ran Wang;Ting Liu;Shangwei Zhang
测定了北京市城乡土壤中黑碳(BC)、总有机碳(TOC)和多环芳烃(PAHs)的含量。农村地区可分为平原区和山区，分别靠近城市和远离城市。北京城市土壤中BC浓度(5.83±3.0 5 mg−1)和BC/TOC比值(0.37±0.15)高于世界背景土壤和北京农村土壤，说明城市环境是BC的重要源和汇。城区内BC的浓度由内向外递减，这与北京的城市化历史有关，并推测了BC在老城区土壤中的积累。北京土壤中的黑碳主要来自化石燃料的燃烧，特别是交通排放。城市地区的多环芳烃浓度中位数(502ngg−1)比农村平原(148ngg−1)和山区(146ngg−1)高一个数量级，这些地区的多环芳烃主要来自城市地区的大气沉降。BC浓度与城区PAHs浓度(p<；0.01)和邻近农村平原区较重的4、5、6环多环芳烃浓度(p<；0.01)呈显著正相关，而在较远的农村山区与其它PAHs浓度无显著相关性。
The concentrations of black carbon (BC), total organic carbon (TOC) and polycyclic aromatic hydrocarbons (PAHs) have been determined in soils from urban and rural areas of Beijing. The rural area can be divided into plain and mountainous areas which are close to and relatively far from the urban area, respectively. Concentration of BC (5.83±3.05mgg−1) and BC/TOC concentration ratio (0.37±0.15) in Beijing’s urban soil are high compared with that in world background soils and rural soils of Beijing, suggesting the urban environment to be an essential source and sink of BC. Concentration of BC in the urban area decreases from the inner city to exterior areas, which correlates with the urbanization history of Beijing and infers accumulation of BC in old urban soils. Black carbon in Beijing soils mainly comes from fossil fuel combustion, especially traffic emission. Median PAH concentration in the urban area (502ngg−1) is one order of magnitude higher than that in the rural plain (148ngg−1) and mountainous area (146ngg−1) where PAHs are supposed to mainly come from atmospheric deposition from the urban area. Concentrations of BC correlate significantly with those of PAHs (p<0.01, except naphthalene) in the urban area and with those of heavier 4-, 5- and 6- ring PAHs (p<0.01) in the adjacent rural plain area, while there is no significant correlation with any PAH in the farther rural mountainous area.