| 1. |
- Ferrara, R, et al.
(författare)
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Atmospheric Mercury Emission At Solfatara Volcano (Pozzuoli, Phlegraean Fields, Italy)
- 1994
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Ingår i: Chemosphere. - : Elsevier BV. - 1879-1298 .- 0045-6535. ; 29:7, s. 1421-1428
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Tidskriftsartikel (refereegranskat)abstract
- Mercury concentrations in air and in condensed steam coming from fumarolic activity at the Solfatara crater (Phlegraean Fields - Italy) were determined. In the condensed steam, mercury was found mainly associated as Hg-S complexes and showed a flux in the range from 0.9 to 4.5 g day(-1). Using the point monitor technique, high values (up to 690 ng m(-3)) of atmospheric mercury levels were observed only close to the main exhaling areas, while background levels (2 ng m(-3)) were measured over the crater area using the lidar technique. An upper limit (<2.4 g day(-1)) for the flux of elemental mercury in air was estimated with the lidar. This remote sensing technique also allowed to assess an upper limit for the SO2 flux (<24 kg day (-1)).
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| 2. |
- Fiedler, Heidelore, 1953-, et al.
(författare)
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QSAR generated octanol-water partition coefficients of selected mixed halogenated dibenzodioxins and dibenzofurans
- 1990
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Ingår i: Chemosphere. - : Elsevier. - 0045-6535 .- 1879-1298. ; 20:10-12, s. 1597-1602
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Tidskriftsartikel (refereegranskat)abstract
- We have calculated the values of pkow, water solubility, and Koc for chlorinated, brominated and mixed halogenated dibenzodioxins and dibenzofurans that have been identified in environmental samples. From the results it can be concluded that brominated and mixed halogenated dioxins and furans will show an ecological behaviour similar to that of the pure chlorinated compounds.
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| 3. |
- Fiedler, Heidelore, 1953-, et al.
(författare)
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Sources and sinks of dioxins : Germany
- 1992
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Ingår i: Chemosphere. - : Elsevier. - 0045-6535 .- 1879-1298. ; 25:7-10, s. 1487-1491
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Tidskriftsartikel (refereegranskat)abstract
- Combustion processes are known to produce dioxins and especially municipal waste incineration is thought to have the highest contribution to the general background. On the other hand the general acceptance of non-thermal waste treatment methods such as composting is much higher than incineration. The results of an estimation on the input of PCDD/PCDF to Germany show that besides the thermal processes so-called sinks for pollutants, such as sewage sludge, compost, and foliage represent a reservoir to release dioxins by use in agriculture.
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| 4. |
- Hauk, A., et al.
(författare)
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Reduction of nitrated phenols : A method to predict half-wave-potentials of nitrated phenols with molecular modeling
- 1990
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Ingår i: Chemosphere. - : Elsevier. - 0045-6535 .- 1879-1298. ; 20:6, s. 717-728
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Tidskriftsartikel (refereegranskat)abstract
- The redox stability of 13 nitrated phenols was investigated using polarographic measured half-wave-potentials. These half-wave-potentials were compared with data from a semi-empirical quantum mechanic computer model. A good correlation was found between LUMO energy and the half-wave-potential for phenols, but for phenolates the correlation coefficient was lower, even when a multivariate regression model was used.
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| 5. |
- Hutzinger, O., et al.
(författare)
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From source to exposure : Some open questions
- 1993
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Ingår i: Chemosphere. - : Elsevier. - 0045-6535 .- 1879-1298. ; 27:1-3, s. 121-129
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Tidskriftsartikel (refereegranskat)abstract
- PCDD/PCDF are trace contaminants in industrial and thermal processes, whose formation often cannot be avoided. Although the most important sources seem to be recognized within the last years new sources have been discovered. Very often only limited data are available. For the understanding of human exposure it is necessary to understand the pathways from the source to target organs or organisms. Environmental concentrations of dioxins have to be analyzed under ectoxicological aspects. Transfer and transformation mechanisms to be considered are: evaporation, deposition, erosion, photochemical degradation
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| 6. |
- GUSTAFSSON, E, et al.
(författare)
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LETHALITY AND EROD-INDUCING POTENCY OF CHLORINATED CHRYSENE IN CHICK-EMBRYOS
- 1994
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Ingår i: CHEMOSPHERE. - : PERGAMON-ELSEVIER SCIENCE LTD. - 0045-6535. ; 29:9-11, s. 2301-2308
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Chrysene was non-specifically chlorinated and the toxic potency of the mixture formed was studied. The chlorinated mixture was considerably more potent than the parent compound in terms of embryolethality and EROD and AHH induction in a 2-week test in chi
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