Benzene and toluene levels measured with a commercial DOAS system in Thessaloniki, Greece
Benzene and toluene levels measured with a commercial DOAS system in Thessaloniki, Greece
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DOI：
10.1016/s1352-2310(99)00375-1
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发表时间：
2000
影响因子：
5
通讯作者：
K. Kourtidis;I. Ziomas;C. Zerefos;Achilleas Gousopoulos;D. Balis;P. Tzoumaka
中科院分区：
文献类型：
--
作者：
K. Kourtidis;I. Ziomas;C. Zerefos;Achilleas Gousopoulos;D. Balis;P. Tzoumaka
在1993年12月至1994年8月期间，通过商业差分光学吸收光谱仪（OPSIS DOAS），在希腊塞萨洛尼基的建筑物水平以上测量了苯、甲苯和对二甲苯约8个月。苯和甲苯的日平均混合比分别为1-6和1- 32 ppb。数据表明，年平均苯浓度最有可能位于2- 3 ppb的范围内，这是低于指导值，但高于欧洲国家设定的苯限值的目标值。夏季和冬季苯和甲苯的平均日变化反映了排放、光化学降解和混合的影响。苯和甲苯的每小时值相互之间以及与NO2的相关性很好。甲苯和苯的小时值与臭氧在夏季呈负相关。在冬季，苯和甲苯混合比的显着增强可能与天气系统的晴朗天气的通道。虽然对二甲苯的测量，原则上，有效地进行了DOAS技术，OPSIS仪器对二甲苯的测量与目前的理解，其源和汇，因此归因于错误的仪器在评估这种物质。
Benzene, toluene and p-xylene were measured above the buildings level in Thessaloniki, Greece for around eight months during the period December 1993–August 1994 by means of a commercial differential optical absorption spectrometer (OPSIS DOAS). Daily mean mixing ratios for benzene and toluene varied between 1–6 and 1–32ppb, respectively. The data indicate that the annual mean benzene concentrations most probably lie in the range 2–3ppb, which is below the guide values but above the target values of European countries that have set limits for benzene. Mean diurnal variations of benzene and toluene during summer and winter months reflect the effects of emission, photochemical degradation and mixing. Benzene and toluene hourly values correlated well with each other and with NO2. Toluene and benzene hourly values were negatively correlated with ozone during summertime. During wintertime, considerable enhancements of benzene and toluene mixing ratios might be associated with the passage of synoptic weather systems of fair weather. Although the measurement of p-xylene is, in principle, efficiently performed with the DOAS technique, the OPSIS instrument p-xylene measurements contradict current understanding of its sources and sinks and are thus attributed to errors of the instrument in the evaluation of this substance.