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261.
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Geyer HJ Schramm KW Feicht EA Behechti A Steinberg C Brüggemann R Poiger H Henkelmann B Kettrup A 《Chemosphere》2002,48(6):631-644
The elimination half-lives (t1/2) in Sprague-Dawley rats for 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD), 1,2, 3,7,8-pentachlorodibenzo-p-dioxin (PeCDD), 1,2,3,4,7,8-hexachlorodibenzo-p-dioxin (HxCDD), 1,2,3,4,6,7,8-heptachlorodibenzo-p-dioxin (HpCDD) and 1,2,3,4,6,7,8,9-octachlorodibenzo-p-dioxin (OCDD) were estimated in long-term studies by Schlatter, Poiger and others. Furthermore, there are some published half-lives of TCDD in adult humans. The average half-life of TCDD in adult humans is approximately 2840 days, while in Sprague-Dawley rats the average t1/2 of TCDD is 19 days. The t1/2 of TCDD in humans is about 150 times that of rats. This factor was used to calculate the t1/2 values of the other polychlorinated dibenzo-p-dioxins (PCDDs) in humans from the rat data. Furthermore, the terminal t1/2 values of PCDDs in adult humans were calculated from the regression equation: logt1/2H = 1.34 logt1/2R + 1.25 which was recently established for 50 xenobiotics (t1/2H = terminal half-lives in days for humans, t1/2R = terminal half-lives in days for rats). The following terminal half-lives in adult humans were obtained: 12.6 years for 1,2,3,7,8-PeCDD, 26-45 years for 1,2,3,4,7,8-HxCDD, 80-102 years for 1,2,3,4,6,7,8-HpCDD and ca. 112-132 years for OCDD. These half-lives of PCDDs are critically compared with measured t1/2 values of PCDDs and other persistent organic pollutants in rats, monkeys and humans. 相似文献
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Dragana Bojovic Carlo Giupponi Hermann Klug Lucia Morper-Busch George Cojocaru Richard Schörghofer 《Journal of Environmental Planning and Management》2018,61(2):214-229
Climate change may result in reduced water supply from the Alps – an important water resource for Europe. This paper presents a multilingual platform that combines spatial and multi-criteria decision-support tools to facilitate stakeholder collaboration in the analysis of water management adaptation options. The platform has an interactive map interface that allows participants to select a location of their interest within the Alpine Arc. By utilising the decision-support tool, stakeholders can identify suitable adaptation solutions for different geographical units, according to their experience and preference. The platform was used to involve experts across Alpine borders, domains and decision-making levels, as well as a group of university students. The experts favoured the planning instruments for saving water, while the students inclined towards the measures that would improve water conservation. The initial results confirmed the suitability of the platform for future involvement of decision-makers in spatio-temporal analyses of adaptation pathways in the Alps. 相似文献
266.
D. Bunke S. Zangl A. Hermann C. Blum J. Wurbs 《Umweltwissenschaften und Schadstoff-Forschung》2010,22(1):36-45
Hintergrund und Ziel Seit Juni 2007 ist in der EU die neue europ?ische Chemikalienverordnung REACH gültig. Wesentlicher Inhalt der neuen Regelung
ist die Einführung eines einheitlichen Systems zur Registrierung, Bewertung, Zulassung und Beschr?nkung von Chemikalien. Die
Hersteller/Importeure von Chemikalien müssen wesentliche Angaben zu den inh?renten Stoffeigenschaften vorlegen und die Bedingungen
für eine sichere Verwendung der Stoffe über den gesamten Lebenszyklus nennen, d. h. für die Herstellung, Verarbeitung, Nutzung
und Entsorgung der Stoffe. Damit birgt REACH das Potenzial von Schnittstellen zu produktbezogenen Regelungen, sofern bei diesen
ebenfalls eine Bewertung der enthaltenen oder emittierten Chemikalien erfolgt. 相似文献
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The ability of Dutch grassland soil and Dutch peat soil for methane oxidation was investigated. The kinetics of methane oxidation by soil from different depths were determined in batch cultures incubated with 1; 10; 100; and 10,000 ppmv methane, respectively. All 4 applied concentrations of methane were degraded by both types of soil. Thereby, the highest oxidative activities were observed between 5 and 10 cm soil depth. Most importantly, these experiments demonstrated that this soil acts as a sink for methane even at concentrations well below 1 ppmv. Especially at higher methane concentrations (100 - 10,000 ppmv) much higher degradation rates were found in the peat soil. This also correlates with the higher methane production rates which had been observed in peat soil. 相似文献
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