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41.
Degradation of macrolide antibiotics by ozone: a mechanistic case study with clarithromycin 总被引:6,自引:0,他引:6
Lange F Cornelissen S Kubac D Sein MM von Sonntag J Hannich CB Golloch A Heipieper HJ Möder M von Sonntag C 《Chemosphere》2006,65(1):17-23
Macrolide antibiotics are widely used (in the order of 1g per person per year). They pass the body largely unchanged and are also not degraded in wastewater treatment plants. With not too much effort, they may be eliminated from their effluents by ozonation. The macrolide antibiotics have all a dimethylamino group at one of the carbohydrate residues in common. This functional group is the target of the ozone reaction, and clarithromycin has been selected here for a more detailed study. Since only the free amine reacts with ozone, the rate of reaction is pH dependent (at pH 7: k = 4 x 10(4) M(-1) s(-1)). In analogy to the ozonolysis of trimethylamine, the main reaction is a transfer of an O-atom yielding the N-oxide (identified by HPLC/MS-MS). A minor product (10%, based on formaldehyde yields) is demethylated clarithromycin (identified by HPLC/MS-MS). The dimethylamino group is thought to be essential for the binding of the macrolide antibiotics to their target. As a consequence, chemical changes of this functional group, notably the formation of the N-oxide that is no longer a proton acceptor, inactivates these drugs as assayed by the suppression of the growth of Pseudomonas putida. This is most important for wastewater treatment, as mineralization of clarithromycin by ozone would require 100 times as much ozone. 相似文献
42.
Clemens?J.?Engelke Heike?KnickerEmail author Ingrid?K?gel-Knabner 《Environmental Chemistry Letters》2004,2(2):71-75
Matrix-assisted laser desorption/ionisation time-of-flight mass spectrometry (MALDI-TOF MS) was used to reveal the influence of iron on the detectability of condensed tannins extracted from
Picea abies. Iron chloride mixed with condensed tannins suppresses the detection of tannins by MALDI-TOF MS in a dose-dependent manner. Total suppression is observed at concentrations of 250 and 500 mg FeCl3 g–1 of sample. At lower concentrations, spectrum quality is still greatly reduced, but short chain tannins are detected. At 100 mg FeCl3 g–1 of sample, iron increased the intensity of the tannin galloyl ester peaks above those of the corresponding tannin polymers. This points to an antagonistic effect of the galloyl ester moiety on iron complexation with condensed tannins and, thus, their reduced susceptibility to iron interference during MALDI-TOF MS. 相似文献
43.
Ammonia emissions after spreading animal manure contribute a major share to N losses from agriculture. There is an increasing interest in anaerobic co-digestion of liquid manure with organic additives. This fermentation results in a change of physical and chemical parameters of the slurry. Among these are an increased pH and ammonium content, implying a higher risk of NH3 losses from fermentation products. To compare different application techniques and the effect of fermentation on NH3 volatilization, we used the standard comparison method and tested it for reliability. This method seems to be perfectly suited for experiments with a large number of treatments and replicates if prerequisites concerning the experimental layout are considered. We tested four different application techniques on arable and grassland sites. The more the substrate was incorporated into the soil or applied near the soil surface on the grassland site, the less NH3 was lost. Injection of the substrate reduced losses to less than 10% of applied NH4+ on both sites, whereas losses after splash plate application amounted to more than 30%. Trail shoe application on grassland performed as well as injection. Harrowing on arable land also reduced emissions efficiently, if harrowing occurred within the first 2 h after application. Emissions from trail hose-applied co-fermentation product were not greater than from unfermented slurry. Better infiltration of the less viscous substrate seemed to have compensated for the increased loss potential. 相似文献
44.
Health risk assessment of dioxin emissions from municipal waste incinerators: the Neerlandquarter (Wilrijk, Belgium) 总被引:2,自引:0,他引:2
Nouwen J Cornelis C De Fré R Wevers M Viaene P Mensink C Patyn J Verschaeve L Hooghe R Maes A Collier M Schoeters G Van Cleuvenbergen R Geuzens P 《Chemosphere》2001,43(4-7):909-923
Two municipal waste incinerators in the vicinity of a residential area close to the city of Antwerp caused concern to local habitants. Risk assessment was performed combining chemical, toxicological measurements and model calculations. As the first step in risk assessment an inventory was made of historic emissions from both incinerators with emphasis on dioxins. The operational atmospheric transport and deposition model for priority substances (OPS) was used to calculate the deposition of dioxins in the vicinity of incinerators. The observed soil contamination pattern did not correspond to the calculated deposition pattern, indicating that other sources may contribute at least partly to the local PCDD/PCDF contamination of the area. Dioxin exposure of people in the Neerlandquarter as a function of the food consumption behavior was calculated using a mathematical model (VLIER-HUMAAN) combined with transfer factors. According to the results of these calculations, just residing in the impact area does not result in a meaningful risk. Only if locally produced food was consumed (milk, meat and vegetables), exposure in the Neerlandquarter was enhanced compared to the average dioxin exposure estimated for the Flemish population. Exposure in 1997 was below the exposure in 1980. As a consequence of different eating habits and lower bodyweight, children are subjected to significantly higher exposure than adults. Adverse health outcomes from dioxin exposure in the past cannot be excluded. There was no evidence for enhanced exposure to genotoxicants based on a comparison of chromosomal damage to blood cells of children from the study area to those from a control group. 相似文献
45.
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47.
Sucharova J Suchara I Hola M Reimann C Boyd R Filzmoser P Englmaier P 《Environmental pollution (Barking, Essex : 1987)》2011,159(5):1205-1214
While terrestrial moss and other plants are frequently used for environmental mapping and monitoring projects, data on the regional geochemistry of humus are scarce. Humus, however, has a much larger life span than any plant material. It can be seen as the “environmental memory” of an area for at least the last 60-100 years. Here concentrations of 39 elements determined by ICP-MS and ICP AES, pH and ash content are presented for 259 samples of forest floor humus collected at an average sample density of 1 site/300 km2 in the Czech Republic. The scale of anomalies linked to known contamination sources (e.g., lignite mining and burning, metallurgical industry, coal fired power plants, metal smelters) is documented and discussed versus natural processes influencing humus quality. Most maps indicate a local impact from individual contamination sources: often more detailed sampling than used here would be needed to differentiate between likely sources. 相似文献
48.
Clemens Driessen 《Journal of Agricultural and Environmental Ethics》2012,25(2):163-179
A plethora of ethical issues in livestock agriculture has emerged to public attention in recent decades, of which environmental
and animal welfare concerns are but two, albeit prominent, themes. For livestock agriculture to be considered sustainable,
somehow these interconnected themes need to be addressed. Ethical debate on these issues has been extensive, but mostly started
from and focused on single issues. The views of farmers in these debates have been largely absent, or merely figured as interests,
instead of being considered morally worthwhile themselves. In this paper the relevance for ethical debates of the ways farmers
discuss and engage with moral concerns is explored. The variety of norms that figure in contemporary farming practices is
sketched in its multifarious complexity, illustrated by ethnographic fieldwork, and systematized in terms of “orders of worth.”
Reviewing the practical arguments and commitments of farmers within this framework reveals that farming practices are subject
to mixed motives, in which an amalgam of types of concerns play a role. Recognition of the peculiarly entangled nature of
the ethics of farming practices could counter the tendency in policy making, technological innovation, and ethical thought
to compartmentalize our moral landscape. Understanding farming practice as the integration of a mosaic of concerns in the
light of a variety of moral experiences would foster public appreciation of positions of farmers in debates on improving the
sustainability and societal acceptability of livestock agriculture. 相似文献
49.
Karen Van de Vel Clemens Mensink Koen De Ridder Felix Deutsch Joachim Maes Jo Vliegen Artash Aloyan Alexander Yermakov Vardan Arutyunyan Tamara Khodzher Bas Mijling 《Environmental monitoring and assessment》2010,165(1-4):665-674
In this paper, we assess the status of the air quality in the Lake Baikal region which is strongly influenced by the presence of anthropogenic pollution sources. We combined the local data, with global databases, remote sensing imagery and modelling tools. This approach allows to inventorise the air-polluting sources and to quantify the air-quality concentration levels in the Lake Baikal region to a reasonable level, despite the fact that local data are scarcely available. In the simulations, we focus on the month of July 2003, as for this period, validation data are available for a number of ground-based measurement stations within the Lake Baikal region. 相似文献
50.
Gunther Umlauf Eugen H. Christoph Laura Lanzini Risto Savolainen Helle Skejo Giovanni Bidoglio Joachim Clemens Heiner Goldbach Heinrich Scherer 《Environmental science and pollution research international》2011,18(3):461-470