| 广州市交通主干道空气中苯系物的测量 |
| 摘要点击 2215 全文点击 1148 投稿时间：2012-01-04 修订日期：2012-03-06 |
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| 中文关键词 差分吸收光谱 苯系物 相关性 交通排放 气象条件 |
| 英文关键词 differential optical absorption spectroscopy BTX correlation traffic emission meteorological conditions |
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| 中文摘要 |
| 为了研究广州市道边空气中苯系物的污染状况,利用差分吸收光谱(DOAS)系统于2010年11 ~12月广州亚运会期间对广州市荔湾区黄沙大道道边空气中的苯系物(苯、甲苯、二甲苯等)及常规污染物NO2、O3等进行了监测. 结果表明,在整个测量期间,苯系物在夜间显示了较高的浓度值,苯的平均浓度为 15.9 μg·m-3、甲苯为 61.3 μg·m-3、对-二甲苯为6.5 μg·m-3、间-二甲苯为16.9 μg·m-3、苯酚为 0.88 μg·m-3. 甲苯与苯的平均浓度与国内其他城市的平均水平较为接近,两者的比值变化范围在 1.2~6.16. 通过比对甲苯与苯的相关性,在整个测量期间内其相关系数为 0.86,在浓度值较高时段,其相关系数达到 0.985,表明在该区域苯与甲苯存在同源性; 以甲苯为例,分析其与CO的相关性,相关系数为 0.78,表明交通排放是苯、甲苯的一个主要来源. 结合风速风向等气象数据的分析得出气象条件是影响苯系物污染物浓度水平的一个重要因子,并给出了可能的点污染源. |
| 英文摘要 |
| In order to study the levels of BTX (benzene, toluene, xylene, etc) nearby the main roads of Guangzhou from November 2010 to December 2010 during the Asian Games, BTX and conventional pollutants such as NO2, O3 in the air were monitored by the DOAS system nearby Huangsha Road, which is in the Liwan District of Guangzhou City. The results showed that, during the entire period, BTX showed a high concentration in the evening and the average concentrations of benzene, toluene, p-xylene, m-xylene and phenol were 15.9 μg·m-3, 61.3 μg·m-3, 6.5 μg·m-3, 16.9 μg·m-3, 0.88 μg·m-3, respectively. The average concentrations of benzene and toluene were close to those in other cities, and the ratio of toluene to benzene was in range of 1.2-6.16. Throughout the monitoring period, the correlation coefficient of benzene and toluene was 0.86 and it rose to 0.985 during the high concentration period, indicating that they had the same source in this region. The correlation coefficient between toluene and CO was 0.78, indicating that traffic emissions was the major source of benzene and toluene. Based on the combination of wind speed, wind direction and other meteorological data, it was found that the weather condition was an important factor which affected the BTX concentration, and some possible point sources were suggested nearby the site. |
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