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A study of airborne metals in Calcasieu Parish,Louisiana using the lichens,Parmelia praesorediosa and Ramalina stenospora |
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| Authors: | Robert L. Thompson Gerald J. Ramelow James N. Beck M. Pamela Langley John C. Young Dennis M. Casserly |
| Affiliation: | 1. Department of Chemistry, McNeese State University, 70609, Lake Charles, LA, U.S.A. 2. Department of Mathematics, Computing Science and Statistics, McNeese State University, 70609, Lake Charles, LA, U.S.A. 3. University of Houston, 77058, Clear Lake, TX, U.S.A. |
| Abstract: | Two common species of lichens from southwestern Louisiana, Parmelia praesorediosa and Ramalina stenospora, were analyzed thrice over a period of 9 mo. Samples were analyzed for Th, Cs, Se, Hg, Cr, Ir, Ce, Sc, Rb, Fe, Zn, Co, Ta, Eu, K, and Sb. No statistical differences in concentration over the time interval studied were seen. However, discriminant analysis showed a significant (>90%) difference between elemental content and species. The data could be separated into two geographical areas that were statistically different. Highest concentrations were observed within a 10.8-km radius of the industrial/urban zone. |
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