Balabanova, Biljana and Lazarova, Maja and Boev, Blazo (2019) Improving the dominance of surface dust absorption vs. bulk deposition in moss tissue cross bio-indication process of metals deposition in environment. In: 2nd International meeting agriscience & practice (ASP 2019), 12th April 2019, Stip, Republic of North Macedonia.
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Abstract
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 absorbed on the moss from the atmosphere either 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. Main problem with issue moss-biomonitoring are reveal as: a) 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 praticular 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 capacity, 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 (emission SEM, TESCAN VEGA3) has been involved for determination of the dry deposition occurred within two species (Homalothecium lutescens and Homalothecium sericeum) from the genus Homalothecium.
| Item Type: | Conference or Workshop Item (Speech) |
|---|---|
| Subjects: | Natural sciences > Chemical sciences Agricultural Sciences > Other agricultural sciences |
| Divisions: | Faculty of Agriculture |
| Depositing User: | Biljana Balabanova |
| Date Deposited: | 20 Aug 2019 13:08 |
| Last Modified: | 20 Aug 2019 13:08 |
| URI: | https://eprints.ugd.edu.mk/id/eprint/22339 |
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