We investigated the polycyclic aromatic hydrocarbons (PAHs) contents in 68 soils samples collected at housing developments that represent different length of development periods across Beijing. Based on the data, we derived a mass balanced mathematical model to simulate the dynamics of PAH accumulations in urban soils as affected by the urban developments. The key parameters were estimated by fitting the modified mass balance model to the data of PAH concentrations vs. building age of the sampling green area. The total PAH concentrations would increase from the baseline of 267 ng g(-1) to 3631 ng g(-1) during the period of 1978-2048. It showed that the dynamic changes in the rates of accumulations of light and heavy PAH species were related to the shifting of sources of fuels, combustion efficiencies, and amounts of energy consumed during the course of development. (C) 2014 Elsevier Ltd. All rights reserved.
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机译：我们调查了68个土壤样本中的多环芳烃（PAHs）含量，这些样本是在住房开发项目中收集的，代表了北京不同时期的发展。基于这些数据，我们推导了一个质量平衡的数学模型，以模拟受城市发展影响的城市土壤中PAH积累的动力学。通过将改进的质量平衡模型拟合到PAH浓度与采样绿色区域的建筑年龄的数据中，可以估算关键参数。在1978-2048年期间，PAH的总浓度将从267 ng g（-1）的基线增加到3631 ng g（-1）。结果表明，轻，重PAH物质积累速率的动态变化与燃料来源的转移，燃烧效率以及在开发过程中消耗的能量有关。 （C）2014 Elsevier Ltd.保留所有权利。
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