| Autor: |
Lucian Barbu-Tudoran, Blažo Boev, Maja Lazarova, Maria Suciu, Biljana Balabanova |
| Přispěvatelé: |
Balabanova, Biljana, Stafilov, Trajče |
| Jazyk: |
angličtina |
| Rok vydání: |
2021 |
| Předmět: |
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| Zdroj: |
Emerging Contaminants and Associated Treatment Technologies ISBN: 9783030661342 |
| Popis: |
Mosses have been used for biomonitoring in a number of different ways which may lead to rather different results, and some kind of classification seems necessary at this point. Epigeic mosses (growing on the ground) are preferred in the regional surveys in Europe. Trace elements may be either absorbed on the moss from the atmosphere as soluble chemical species in wet deposition or contained in particles from dry deposition. Part of the trace element content of particulates may eventually be released by weathering and reabsorbed by the moss. Whereas uptake efficiencies for particulate-bound trace elements are generally poorly known, ions may be subject to active uptake into cells or attached on the moss surface by physical and chemical forces. Methods are available to distinguish between intracellular and surface-bound fractions of elements. The main problem with the issue of moss biomonitoring is revealed as (a) the transport of soluble compounds from the soil into moss tissue, particularly during periods with excessive soil/water contact. Although mosses do not have a root system, influence from this source cannot be disregarded, in particular in areas with low atmospheric deposition and (b) windblown mineral dust from local soil. As far as the surface-bound fraction is concerned, little is known about the binding mechanisms, but the fact that different metals show rather large differences in their retention capacities indicates that both simple cation exchange on negative surface charges and complex formation with ligands on the moss surface are involved. Laboratory analysis using scanning electron microscopy has been involved for the determination of the dry deposition occurring within moss bioindicators. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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