| 1. |
- Ferrara, R, et al.
(författare)
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Vertical Profiles of Atmospheric Mercury Concentration
- 1992
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Ingår i: Environmental Technology. - : Informa UK Limited. - 1479-487X .- 0959-3330. ; 13:11, s. 1061-1068
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Tidskriftsartikel (refereegranskat)abstract
- Vertical profiles of atmospheric mercury concentration determined with a lidar and point monitor systems in the mineralized region of Mt. Amiata (Italy) are reported. Measurements were performed over a large flat area, without arboreal and herbaceous vegetation, constituting a roasted cinnabar deposit which still contains about two parts per thousand of mercury. The determinations carried out with the two techniques yielded comparable results for the working conditions used. Data demonstrate the presence of a vertical gradient of atmospheric mercury concentration, which is particularly large in the layers of air nearest the soil. The highest values (45-1000 ng m-3) were measured a few centimeters from the soil, while background values (2-3 ng m-3) were reached at heights of 10-20 m. The vertical gradient proved to be strongly dependent on ambient temperature.
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| 2. |
- Johansson, Lena, 1967-, et al.
(författare)
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Transplanted aquatic mosses and freshwater mussels to investigate the trace metal contamination in the rivers Meurthe and Plaine, France
- 1993
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Ingår i: Environmental technology. - 0959-3330 .- 1479-487X. ; 14:11, s. 1027-1036
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Tidskriftsartikel (refereegranskat)abstract
- Aquatic mosses Cinclidotus nigricans and freshwater mussels Dreissena polymorpha were transferred at eight monitoring sites along the rivers Meurthe and Plaine (northeastern France) for a biological assessment of the trace metal contamination. Autochthonous Fontinalis antipyretica mosses were collected at the end of the experiment. The major contaminants detected in the organisms were Cr, Ni, Pb and Zn. A comparison between the native and the introduced bryophytes showed that the transfer technique was preferable to assess the recent pollution situation. In the case of the transplanted mosses, high initial levels of strongly bound Pb and Zn prevented an accurate assessment of the contamination with these two metals, since only little depuration occurred at unpolluted sites. A good qualitative agreement was observed between the indications obtained from the mosses and those obtained from the mussels, suggesting that both are suitable indicators for monitoring purposes. The observed quantitative disparities were attributed to inherent differences in the accumulation strategies of each sentinel organism. Due to specific uptake and depuration kinetics, mosses and mussels appeared to be complementary in the detection of various types of pollution.
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