| Autor: |
Rimondi V; Dipartimento di Scienze della Terra, Università di Firenze, Via G. La Pira 4, 50121 Firenze, Italy.; CNR-IGG, Via G. La Pira 4, 50121 Firenze, Italy., Benesperi R; Dipartimento di Biologia, Università di Firenze, Via G. La Pira 4, 50121 Firenze, Italy., Beutel MW; University of California, Merced, 5200 Lake Road, Merced, CA 95343, USA., Chiarantini L; Dipartimento di Scienze della Terra, Università di Firenze, Via G. La Pira 4, 50121 Firenze, Italy.; Centro di Servizi di Microscopia Elettronica e Microanalisi (M.E.M.A), Università di Firenze, Via G. Capponi 3r, 50121 Firenze, Italy., Costagliola P; Dipartimento di Scienze della Terra, Università di Firenze, Via G. La Pira 4, 50121 Firenze, Italy.; CNR-IGG, Via G. La Pira 4, 50121 Firenze, Italy., Lattanzi P; CNR-IGG, Via G. La Pira 4, 50121 Firenze, Italy., Medas D; Dipartimento di Scienze Chimiche e Geologiche, Università di Cagliari, S.S. 554 bivio per Sestu, 09042 Monserrato (CA), Italy., Morelli G; CNR-IGG, Via G. La Pira 4, 50121 Firenze, Italy. |
| Abstrakt: |
In the present study, mercury (Hg) concentrations were investigated in lichens ( Flavoparmelia caperata (L.) Hale, Parmelia saxatilis (L.) Ach., and Xanthoria parietina (L.) Th.Fr.) collected in the surrounding of the dismissed Abbadia San Salvatore Hg mine (Monte Amiata district, Italy). Results were integrated with Hg concentrations in tree barks and literature data of gaseous Hg levels determined by passive air samplers (PASs) in the same area. The ultimate goal was to compare results obtained by the three monitoring techniques to evaluate potential mismatches. Lichens displayed 180-3600 ng/g Hg, and Hg concentrations decreased exponentially with distance from the mine. Mercury concentration was lower than in Pinus nigra barks at the same site. There was a moderate correlation between Hg in lichen and Hg in bark, suggesting similar mechanisms of Hg uptake and residence times. However, correlation with published gaseous Hg concentrations (PASs) was moderate at best (Kendall Tau = 0.4-0.5, p > 0.05). The differences occurred because a) PASs collected gaseous Hg, whereas lichens and barks also picked up particulate Hg, and b) lichens and bark had a dynamic exchange with the atmosphere. Lichen, bark, and PAS outline different and complementary aspects of airborne Hg content and efficient monitoring programs in contaminated areas would benefit from the integration of data from different techniques. |
