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۱In situ Measurement of Bioavailable Metal Concentrations at the Downstream on the Morava River using Transplanted Aquatic mosses and DGT Technique
نویسنده(ها): ، ، ، ، ، ، ، ، ، ، ،
اطلاعات انتشار: International Journal Of Environmental Research، ششم،شماره۱، Winter ۲۰۱۲، سال
تعداد صفحات: ۸
This work summarized the results of a long term monitoring programme performed downstream on the Morava river (Czech Republic). During this programme the total dissolved concentrations and bioavailable fraction of selected metals (Zn, Pb, Ni, Cu) were monitored. For the determination of bioavailable metals species, diffusive gradients in thin films technique (DGT) together with moss bags technique utilizing Fontinalis antipyretica moss species were used. All of the measured metal concentrations were compared with an amount of accumulated mass by Fontinalis antipyretica, represented as a concentration factor, CF. Obtained results shown that further investigation of DGT technique and metal accumulation processes by Fontinalis antipyretica is needed to conclude if the DGT technique is a good alternative for the biomonitoring technique using Fontinalis antipyretica moss bags as a means to measure (bio)available metal concentrations in natural water. Significant correlation with CF was found in the case of DGTZn and DGTPb concentrations. On the other site, accumulated mass of Cu by Fontinalis antipyretica correlated significantly with total dissolved concentration of Cu. In the case of Ni no correlation was found between total dissolved Ni concentrations, DGTNi concentration and CF of Fontinalis antipyretica.

۲Dandelion Plants as a Biomonitor of Urban Area Contamination by Heavy Metals
نویسنده(ها): ، ، ، ،
اطلاعات انتشار: International Journal Of Environmental Research، هشتم،شماره۱، Winter ۲۰۱۴، سال
تعداد صفحات: ۸
To examine metal content of dandelion plants in relation to environmental metal levels, concentrations of Cd, Hg and Pb were analyzed in plant parts (leaves and roots) and soil samples from five sites in the city of Brno (Czech Republic), differentially impacted by pollution. Soils and plants were collected mid–April 2011. Atomic absorption spectrometry was used to determine concentrations of the studied elements. The amount of metals measured in soils and plants corresponded with the contamination load of the sampling place. The highest values of metals were found in the soil and plants sampled at Opuštěná Street, a heavily polluted locality with high traffic density situated in the city centre. Significant correlations were found between the amount of Cd in the soil and in the dandelion roots (r = 0.863) and between the amount of Pb (r = 0.870) and Hg (r = 0.828) in the soil and in the dandelion leaves. Higher Cd content was found in underground part of the plants, indicating soil contamination. The higher Hg and Pb content in leaves rather than in roots in all locations illustrated a contribution of significant atmospheric deposition. Washing the leaves before the analysis significantly reduced the measured metal concentrations. This indicated that substantial amount of metals was on the leaves surface as dry aerosol particles. Inter–metal correlations between soil, leaves and roots samples showed that the sources of Cd, Pb and Hg pollution in Brno urban areas were mainly of anthropogenic origin. The content of heavy metals both in the dandelion plant tissue and in the soil should be seen as a good indicator of natural urban environmental pollution.
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