Institute of Nuclear and New Energy Technology, Tsinghua University, Energy Science Building, Beijing, China.
Environ Monit Assess. 2010 Sep;168(1-4):21-31. doi: 10.1007/s10661-009-1088-1. Epub 2009 Jul 18.
Within the Sino-Italian environmental protection cooperation framework established in 2002, a comprehensive air quality monitoring network has been developed in urban Suzhou, a medium-sized Chinese city, in compliance with European standards (Directive 96/62/EC). This paper is among the first attempts to present a systematic and scientific analysis of benzene, toluene, and xylenes (BTX) pollution in China. It presents our analysis of BTX space-related and time-related measurement results. Background BTX concentrations were investigated by passive sampler Analyst(R) in 2003. We depicted the spatial distribution of average BTX concentrations collected from three 15-day campaigns on isoconcentration maps. This is the first time such detailed BTX concentration maps have been developed in China in a city scale. Continuous measurement of BTX by automatic gas chromatography was carried out at two fixed monitoring stations, one in an urban residential zone and one in a heavy traffic zone, from April to December 2005. The results show similar seasonal trends at both sites, the similarities reaching their greatest level in December and their lowest level in August. The average daily profile of BTX shows greater fluctuation in spring and winter with clear morning and evening peaks. Daily average benzene, toluene, and m,p-xylenes concentrations for the study period were 2.64, 11.52, and 3.52 microg m(-3), respectively. The benzene/toluene ratio we found was lower in Suzhou than those published in studies of other worldwide cities, which indicates serious levels of toluene pollution from local stationary sources. The similarities in seasonal trend and spatial distribution in these manual and automatic measurement results were compared with each other, though the concentration values differed.
在中国和意大利 2002 年建立的环境保护合作框架内，中国中等城市苏州按照欧洲标准（指令 96/62/EC）建成了一个全面的空气质量监测网络。本文首次尝试对中国苯、甲苯和二甲苯（BTX）污染进行系统和科学的分析，介绍了 BTX 的空间和时间相关测量结果。背景 BTX 浓度是用被动采样器 Analyst(R)在 2003 年进行测量的。我们在等浓度图上描绘了从三个为期 15 天的测量活动中收集到的平均 BTX 浓度的空间分布。这是中国首次在城市尺度上绘制如此详细的 BTX 浓度图。2005 年 4 月至 12 月，在两个固定监测站使用自动气相色谱仪对 BTX 进行连续测量，一个位于城市住宅区，一个位于交通繁忙区。结果表明，两个站点的季节变化趋势相似，12 月的相似性最大，8 月的相似性最小。BTX 的日平均浓度曲线在春季和冬季波动较大，早晚有明显的峰值。研究期间苯、甲苯和间、对二甲苯的日平均值分别为 2.64、11.52 和 3.52μg m(-3)。我们发现的苏州苯/甲苯比值低于其他世界城市研究中公布的值，这表明当地固定污染源的甲苯污染严重。虽然浓度值不同，但手动和自动测量结果的季节趋势和空间分布相似性进行了比较。
