| PMF和PCA/MLR法解析上海市高架道路地表径流中多环芳烃的来源 |
| 摘要点击 5368 全文点击 1509 投稿时间：2012-12-08 修订日期：2013-03-26 |
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| 中文关键词 多环芳烃 地表径流 源解析 正定矩阵因子分解 主成分分析/多元线性回归 |
| 英文关键词 PAHs road runoff source apportionment PMF PCA/MLR |
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| 中文摘要 |
| 以上海市内环高架道路径流中的多环芳烃(PAHs)为研究对象,于2012年7~9月,实测了8场降雨的道路径流中的PAHs,了解了城市交通干道径流中PAHs的污染状况,并采用正定矩阵因子分解(PMF)和主成分分析/多元线性回归(PCA/MLR)两种模型对径流中的PAHs进行源解析. 因子分析表明,径流中∑16 PAHs的浓度范围为1.585~7.523 μg·L-1,两种模型对于PAHs的来源有较为一致的判定. 交通源为高架道路地表径流中PAHs的主要来源,PMF和PCA/MLR得到的源贡献率分别为37.7%和44.3%,其余3种来源石油源、燃气源和其他源,PMF得到的源贡献率依次为21.9%、26.4%、14.0%; 与之对应,PCA/MLR得到的源贡献率依次为28.9%、18.3%、8.5%. PMF和PCA/MLR模型的计算值与实测值拟合较好,相关系数分别为0.961和0.997. |
| 英文摘要 |
| Runoff samples of the Shanghai elevated inner highway were collected and analyzed during the rainy season of 2012 to investigate the pollution characteristics of 16 USEPA priority pollutant polycyclic aromatic hydrocarbons (PAHs). Total PAHs concentrations ranged from 1.585 to 7.523 μg·L-1. The sources of PAHs in the runoff were determined by using 2 source apportionment models, positive matrix factorization (PMF) and principal component analysis with multivariate linear regression (PCA/MLR). Source profiles and contributions obtained from the two models were comparable. For PMF, PAHs mainly came from vehicle emissions (37.7%), followed by petroleum products (21.9%), combustive gas (26.4%), and other sources (14.0%). As for PCA/MLR, it was 44.3%, 28.9%, 18.3%, 8.5%, respectively. The relation between the modeled total PAH concentrations and the measured concentrations was strong, with the correlation coefficient of 0.961 for PMF and 0.997 for PCA/MLR. |
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