Mercury isotopes in plants
Başlık çevirisi mevcut değil.
- Tez No: 402628
- Danışmanlar: DR. LEROY ODOM
- Tez Türü: Yüksek Lisans
- Konular: Ziraat, Agriculture
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 2010
- Dil: İngilizce
- Üniversite: Florida State University
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 54
Özet
Özet yok.
Özet (Çeviri)
As a global pollutant and a metal toxic to living organisms, mercury is one of the most environmentally studied elements. The mercury cycle is a complex phenomenon due to transfonnations in various media and exchange between them. Thus, there is an incomplete und erstanding of the mercury cycle in the environment. The recent fınding of Mass Independent Fractionation (MIF) of mercury isotopes (Bergquist and Blum, 2007; Ghosh et al., 2008) portend a new understanding of mercury isotopes and the mercury cycle in the environment. Different mercury isotopic features of different materials potentially indicate possible different transfonnations of mercury. This study attempts to define mercury isotopic features of plants and relate these with different photosynthetic pathways which are obtained by examining carbon isotopic signatures of plants. Plants were sub-sampled into leaves, stems and roots, with the understanding that if fractionation of mercury isotopes occurred in vivo, plants might be isotopically heterogeneous. Soil samples were also analyzed in this study to examine possible differences between plants and soils and also possible transfonnations inside the plants. Both C3 and C4 plants exhibit mass dependent and mass independent mercury isotope effects. Both C3 and C4 plants are enriched in light isotopes, but the degree of mass :fractionation is approximately three times greater in C3 plants, than in C4 plants ( -0.29%o/amu compared to - 0.09%o/amu). Mercury in both C3 and C4 plants exhibit a MIF isotope effect as well; that being a depletion (generally less than 0.5%o) of the odd mass isotopes 199Hg and 201Hg. The one CAM plant studied contained mercury that is slightly heavy isotope enriched and with no clearly discemable MIF effect. These findings suggest a connection between the isotopic composition of mercury and the photosynthetic pathway of the plants. Leaves are slightly more :fractionated than the roots are. The mass dependent effect is a light isotope enrichment of up to 1.54 %o. Mass independent fractionation is a relative depletion of the odd mass isotopes with L1199Hg ranging from -0.12 to -0.6 %o. A difference in the MIF effect of root-leaf pairs seems to require different sources. Soils also showed similar isotopic feature with the plants samples.
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