| 重庆市大气二(口恶)英污染水平及季节变化 |
| 摘要点击 2126 全文点击 1138 投稿时间：2013-04-12 修订日期：2013-05-21 |
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| 中文关键词 二(口恶)英 大气 季节变化 功能区 常规指标 |
| 英文关键词 dioxin atmosphere seasonality functional areas conventional indicators |
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| 中文摘要 |
| 一年内分季节对重庆市不同功能区大气中二(口恶)英（PCDD/Fs）污染情况进行了监测研究. 结果表明，重庆市大气中PCDD/Fs浓度范围和平均值（以TEQ计）分别为0.017~0.21 pg·m-3和（0.094±0.054） pg·m-3. PCDD/Fs污染水平区域分布和季节变化明显，分别为：商住区>郊区>对照点，冬季>春季>秋季>夏季. 其中，冬季时大气中的二(口恶)英浓度约为夏季时的2.2~4.6倍. 主成分分析结果显示，PCDD/Fs同系物分布特征季节变化明显：冬、春季时主要表现为颗粒相中的分布特征，夏、秋季节则主要表现为气相中的. 相关性分析表明，PCDD/Fs异构体质量浓度与SO2、NO2、PM10和TSP等常规参数含量大都呈显著正相关，与O3则呈负相关，但未达显著性水平. 这表明，重庆大气PCDD/Fs的空间分布和季节变化与SO2、NO2、PM10和TSP等环境空气质量常规指标的分布情况基本一致，重庆大气PCDD/Fs污染与常规污染物的排放源密切相关. |
| 英文摘要 |
| As a comprehensive monitoring survey on polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) in Chongqing, 20 ambient air samples taken from 5 locations in four seasons were studied. The PCDD/F TEQ concentrations varied from 0.017 pg·m-3 to 0.21 pg·m-3. The average value was (0.094±0.054) pg·m-3. The PCDD/F concentrations varied by locations and seasons, and the orders were: urban area>suburban area>background area,and Winter>Spring>Autumn>Summer. The concentrations of PCDD/Fs were 2.2-4.6 times higher in the winter than during the summer. The PCA results indicated that PCDD/F homologue pattern varied by seasons. The PCDD/F homologue pattern in particle dominated in winter and spring, and the pattern in gas dominated in summer and autumn. The mass concentration of PCDD/F congener was significantly positively correlated with that of SO2, NO2, PM10 and TSP, and insignificantly negatively correlated with that of O3,respectively. The results showed that spatial distribution and seasonal variation of atmospheric PCDD/Fs in Chongqing was consistent with that of these conventional indicators, and the PCDD/Fs pollution was closely related with the emission sources of SO2, NO2, PM10 and TSP. |
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