Stracquadanio Milena, Dinelli Enrico, Trombini Claudio
University of Bologna, CIRSA, via Marconi 2, Ravenna 48100, Italy.
J Environ Monit. 2003 Dec;5(6):984-8. doi: 10.1039/b308587b.
The role of volcanic ash as scavenger of atmospheric pollutants, in their transport and final deposition to the ground is examined. Attention is focused on polycyclic aromatic hydrocarbons (PAHs) and on particulate mercury (Hgp). The ash-fall deposits studied belong to the 2001 and 2002 eruptive activity of Mount Etna, Southern Italy, and were investigated at three (2001) and four (2002) sites downwind of the major tephra dispersal pattern. The dry deposition of mercury and PAHs was determined, and, in particular, a downward flux to the ground of PAHs (approximately 7.29 microg m(-2) per day) and mercury (750 ng m(-2) per day) was estimated in Catania from October 26 to October 28, 2002. Finally, evidence on the anthropogenic origin of PAHs scavenged from the troposphere by volcanic ash is supported by the analysis of PAH compositions in granulometrically homogeneous fractions.
研究了火山灰在大气污染物的清除、传输以及最终沉降到地面过程中的作用。重点关注多环芳烃（PAHs）和颗粒态汞（Hgp）。所研究的火山灰沉降沉积物属于意大利南部埃特纳火山2001年和2002年的喷发活动产物，在主要火山灰扩散模式下风方向的三个（2001年）和四个（2002年）地点进行了调查。测定了汞和多环芳烃的干沉降，特别是在2002年10月26日至10月28日期间，估计卡塔尼亚地区多环芳烃（约每天7.29微克每平方米）和汞（每天750纳克每平方米）向地面的沉降通量。最后，通过对粒度均匀部分中多环芳烃组成的分析，支持了火山灰从对流层清除的多环芳烃具有人为来源的证据。
