Influence of vehicle population on atmospheric levels of carcinogenic polycyclic aromatic hydrocarbons.doc

Influence of vehicle population on atmospheric levels of carcinogenic polycyclic aromatic hydrocarbons
(作者:___________单位: ___________邮编: ___________)
【摘要】 Application of the linear regression between vehicle types/numbers and PAH contents (Particle + Vapor) within a radius of 60 and 300 miles can be employed to assess the impact of long range atmospheric transportation (LRAT) to the level of PAHs in the rural atmosphere of Whitbourne, UK. In general, higher Rvalues coupled with lower Pvalues were found in those samples within a radius of 300 miles, whereas lower Rvalues were detected in those samples within a radius of 60 miles. Rvalues of PAH concentrations vs. all vehicle numbers within radius of 300 miles ranged from to with the arithmetic mean of ± , whilst those Rvalues within a radius of 60 miles ranged from to with the arithmetic mean of ± . This supports the hypothesis that PAHs in Whitbourne undergo LRAT.
【关键词】 Polycyclic aromatic hydrocarb
ons; Linear regression; Vehicle types and numbers; Whitbourne
INTRODUCTION

Polycyclic aromatic hydrocarbons (PAHs) has been widely acknowledged as ubiquitous carcinogenic in the atmospheric environment, generally containing two to eight benzene rings and can be produced in natural (. volcanic eruptions, forest fires) and anthropogenic (. traffic emissions, industrial activities, aluminium production, domestic heating and o smoking) processes (Harvey 1991; Menzie et al 1992; Mastral and Callén 2000; Sanderson et al 2000; Korenaga et al 2001; Ohura et al 2004; Repace et al 2004). PAHs were detected in a wide range of partments in remote areas such as the Artic as consequences of agricultural practice, accidental spillage and uncontrolled release of industrial effluents (Halsall et al 1994 and 2000; Drr et al 1996) and exist mainly in the vapor phase. Therefore, they have atmospheric lifetimes that are relatively short, on the order of hours or days (Brubaker et