Pongpiachan Siwatt
NIDA Center for Research and Development of Disaster Prevention and Management, School of Social and Environmental Development, National Institute of Development Administration (NIDA), Sereethai Road, Klong-Chan, Bangkapi, Bangkok, Thailand.
Asian Pac J Cancer Prev. 2013;14(3):1851-63. doi: 10.7314/apjcp.2013.14.3.1851.
Diurnal variation of particulate polycyclic aromatic hydrocarbons (PAHs) was investigated by collecting PM10 at three different sampling altitudes using high buildings in the city center of Chiang-Mai, Thailand, during the relatively cold period in late February 2008. At site-1 (12 m above ground level), B[a]P concentrations ranged from 30.3 -1,673 pg m-3 with an average of 506±477 pg m-3, contributing on average, 8.09±8.69% to ?PAHs. Ind and B[b]F concentrations varied from 54.6 to 4,579 pg m-3 and from 80.7 to 2,292 pg m-3 with the highest average of 1,187±1,058 pg m-3 and 963±656 pg m-3, contributing on average, 19.0±19.3% and 15.4±12.0% to ?PAHs, respectively. Morning maxima were predominantly detected in all observatory sites, which can be described by typical diurnal variations of traffic flow in Chiang-Mai City, showing a morning peak between 6 AM. and 9 AM. Despite the fact that most monitoring sites might be subjected to specific-site impacts, it could be seen that PAH profiles in Site-1 and Site-2 were astonishingly homogeneous. The lack of differences suggests that the source signatures of several PAHs become less distinct possibly due to the impacts of traffic and cooking emissions from ground level.
2008年2月下旬相对寒冷的时期，在泰国清迈市中心利用高层建筑在三个不同采样高度收集PM10，对颗粒态多环芳烃（PAHs）的日变化进行了研究。在1号采样点（地面以上12米），苯并[a]芘浓度范围为30.3 - 1673 pg/m³，平均为506±477 pg/m³，平均占总PAHs的8.09±8.69%。茚并[1,2,3-cd]芘和苯并[b]荧蒽浓度分别在54.6至4579 pg/m³和80.7至2292 pg/m³之间变化，平均最高值分别为1187±1058 pg/m³和963±656 pg/m³，平均分别占总PAHs的19.0±19.3%和15.4±12.0%。在所有观测点均主要检测到早晨最大值，这可以用清迈市典型的交通流量日变化来解释，即在上午6点至9点之间出现早晨高峰。尽管大多数监测点可能受到特定地点的影响，但可以看出1号采样点和2号采样点的PAH分布惊人地相似。缺乏差异表明，由于地面交通和烹饪排放的影响，几种PAHs的源特征可能变得不那么明显。
