Polycyclic Aromatic Hydrocarbons (PAHs) molecular diagnostic ratios (MDRs) are unitless concentration ratios of pair-PAHs with the same molecular weight (MW); MDRs have long been used as a tool for PAHs source identification purposes. In the present paper, the efficiency of the MDR methodology is evaluated through the use of a multimedia fate model, the calculation of characteristic travel distances (CTD) and the estimation of air concentrations for individual PAHs as a function of distance from an initial point source. The results show that PAHs with the same MW are sometimes characterized by substantially different CTDs and therefore their air concentrations and hence MDRs are predicted to change as the distance from the original source increases. From the assessed pair-PAHs, the biggest CTD difference is seen for Fluoranthene (107 km) vs. Pyrene (26 km). This study provides a strong indication that MDRs are of limited use as a source identification tool.

译文

多环芳烃 (PAHs) 分子诊断比 (mdr) 是具有相同分子量 (MW) 的PAHs的无单位浓度比; Mdr长期以来一直被用作PAHs来源鉴定的工具。在本文中,通过使用多媒体命运模型,计算特征行进距离 (CTD) 以及估算各个PAHs的空气浓度 (作为距离的函数) 来评估MDR方法的效率。初始点源。结果表明,具有相同MW的PAHs有时具有明显不同的ctd特征,因此,它们的空气浓度和mdr预计会随着距原始源的距离增加而变化。从评估的PAHs对来看,荧蒽 (107千米) 与芘 (26千米) 的CTD差异最大。这项研究有力地表明,mdr作为来源识别工具的用途有限。

+1
+2
100研值 100研值 ¥99课程
检索文献一次
下载文献一次

去下载>

成功解锁2个技能,为你点赞

《SCI写作十大必备语法》
解决你的SCI语法难题!

技能熟练度+1

视频课《玩转文献检索》
让你成为检索达人!

恭喜完成新手挑战

手机微信扫一扫,添加好友领取

免费领《Endnote文献管理工具+教程》

微信扫码, 免费领取

手机登录

获取验证码
登录