Pb Isotope Composition in Lichens and Aerosols from Eastern Sicily: Insights into the Regional Impact of Volcanoes on the Environment

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• 作者：Fabrice Monna ; Alessandro Aiuppa ; Daniela Varrica ; and Gaetano Dongarra
• 刊名：Environmental Science & Technology
• 出版年：1999
• 出版时间：August 1, 1999
• 年：1999
• 卷：33
• 期：15
• 页码：2517 - 2523
• 全文大小：131K
• 年卷期：v.33,no.15(August 1, 1999)
• ISSN：1520-5851

文摘

A total of 25 lichen thalli of Parmelia conspersa (Ehrh),collected at Vulcano island and at Mt. Etna, during a one-year biogeochemical survey, were analyzed for Pb, Br,Al, Sc, ²⁰⁶Pb/²⁰⁷Pb, and ²⁰⁸Pb/²⁰⁶Pb ratios. Lead isotope ratioswere also measured on aerosols samples from urbanareas and industrial sites of Sicily. The observed ²⁰⁶Pb/²⁰⁷Pb range for urban and industrial aerosols (1.103-1.174)closely matches the anthropogenic signature (1.080-1.165). Lichens (²⁰⁶Pb/²⁰⁷Pb = 1.156-1.226), instead, arecloser to the compositional field of ²⁰⁶Pb rich geogenicsources. This natural input is more evident at Vulcano islandthan at Mt. Etna, where the anthropogenic activities areconsiderably more effective. On the basis of lead isotopedata, Pb/Br ratios and calculated lead enrichmentfactors, a "natural" lead pollution from volcanoes issuggested. Volcanic lead contribution ranges from 10 to30% at Mt. Etna to 10-80% at Vulcano island.