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Paper des Monats
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An environmentally friendly and cost efficient way for the management of municipal solid waste incineration (MSWI) fly ash represents its thermal co-treatment together with combustible waste. However, the safe introduction and storage of MSWI fly ash in the waste bunker is challenging and associated with severe problems (e.g. dust emissions, generation of undefined lumps and heat in case of moistened MSWI fly ash). Therefore, the aim of this study is to investigate the suitability of pelletisation as a pretreatment of MSWI fly ash. In particular, MSWI fly ash was characterised after sampling, pelletisation and thermal treatment and the transfer of constituents to secondary fly ash and flue gas was investigated. For this purpose, MSWI fly ash pellets with a water content of about 0.15 kg/kg and a diameter of about 8 mm have been produced by disc pelletiser and treated in an electrically heated pilot-scale rotary kiln at different temperatures, ranging from 450°C to 1050°C. The total contents of selected elements in the MSWI fly ash before and after thermal treatment and in the generated secondary fly ash have been analysed in order to understand the fate of each element. Furthermore, leachable contents of selected elements and total content of persistent organic pollutants of the thermally treated MSWI fly ash were determined. Due to the low total content of Hg (0.7 mg/kg) and the low leachate content of Pb (<0.36 mg/kg), even at the lowest treatment temperature of 450°C, thermally treated MSWI fly ash pellets can be classified as nonhazardous waste. However, temperatures of at least 650°C are necessary to decrease the toxic equivalency of PCDD/F and DL-PCB. The removal of toxic heavy metals like Cd and Pb is significantly improved at temperatures of 850°C, 950°C or even 1050°C. The observed metal removal led to relatively high contents of e.g. Cu (up to 11,000 mg/kg), Pb (up to 91,000 mg/kg) and Zn (up to 21,000 mg/kg) in the secondary fly ash. This metal enriched secondary fly ash might represent a potential raw material for metal recovery (e.g. via acidic leaching). Due to the high content of total dissolved solids observed in the leachate of thermally treated MSWI fly ash pellets, a wet extraction procedure is suggested to enable its safe disposal at non-hazardous waste landfills.
The presentation gives an overview about the use of ecotoxicity testing in assessment of waste. Especially in cases with unknown composition this kind of test are useful. Recently, the assessment of the hazard property HP 14 "ecotoxicity" for the labelling of waste was published. The labelling procedure is explained in detail.
The presentation gives an overview about the use of ecotoxicity testing in assessment of waste. Especially in cases with unknown composition this kind of test are useful. Recently, the assessment of the hazard property HP 14 "ecotoxicity" for the labelling of waste was published. The labelling procedure is explained in detail.
The presentation gives an overview about the use of ecotoxicity testing in assessment of waste. Especially in cases with unknown composition this kind of test are useful. Recently, the assessment of the hazard property HP 14 "ecotoxicity" for the labelling of waste was published. The labelling procedure is explained in detail.
Zearalenone (ZEN) and its phase II sulfate and glucoside metabolites have been detected in food and feed commodities. After consumption, the conjugates can be hydrolyzed by the human intestinal microbiota leading to liberation of ZEN that implies an underestimation of the true ZEN exposure. To include ZEN conjugates in routine analysis, reliable standards are needed, which are currently not available. Thus, the aim of the present study was to develop a facilitated biosynthesis of ZEN-14-sulfate, ZEN-14-glucoside and ZEN-16-glucoside. A metabolite screening was conducted by adding ZEN to liquid fungi cultures of known ZEN conjugating Aspergillus and Rhizopus strains. Cultivation conditions and ZEN incubation time were varied. All media samples were analyzed for metabolite formation by HPLC-MS/MS. In addition, a consecutive biosynthesis was developed by using Fusarium graminearum for ZEN biosynthesis with subsequent conjugation of the toxin by utilizing Aspergillus and Rhizopus species. ZEN-14-sulfate (yield: 49%) is exclusively formed by Aspergillus oryzae. ZEN-14-glucoside (yield: 67%) and ZEN-16-glucoside (yield: 39%) are formed by Rhizopus oryzae and Rhizopus oligosporus, respectively. Purities of ≥73% ZEN-14-sulfate, ≥82% ZEN-14-glucoside and ≥50% ZEN-16-glucoside were obtained by 1H-NMR. In total, under optimized cultivation conditions, fungi can be easily utilized for a targeted and regioselective synthesis of ZEN conjugates.
Die BAM wurde 2009 u. a. mit der Zulassung von Bewehrungsgittern für den Deponiebau beauftragt. Der Stand von Wissenschaft und Technik bot jedoch keine ausreichende Grundlage, die tatsächlich relevanten Widerstände und die mit diesen Widerständen verbundene Wechselwirkung zwischen Gitter und Boden im Hinblick auf eine mindestens 100-jährige Funktionsdauer realistisch beurteilen zu können. Es wurde daher nur eine vorläufige Zulassungsrichtlinie für diese Produkte erarbeitet. In der Zwischenzeit hat sich ein neuer Kenntnisstand ergeben. Vor diesem Hintergrund hat die AG (Arbeitsgruppe) Geogitter des Fachbeirats der BAM am 26.09.2017 getagt. Es sollen die aktuellen Erkenntnisse und Schlussfolgerungen für die Zulassung in Kürze vorgestellt werden. Die entsprechenden Kapitel beruhen dabei auf einem Arbeitspapier von W.W. Müller und dem Autoren, das der Arbeitsgruppe zur Diskussion vorgelegt wurde.
Weiterhin soll über Entwicklungen in Zusammenhang mit Kunststoffdichtungsbahnen (KDB) berichtet werden. Die Anforderungen an die Schweißzusätze für das Extrusionsschweißen wurden angepasst. Zudem soll über die aktuelle Diskussion der Schweißbarkeit unterschiedlicher HDPE Materialien informiert werden. Die maßgebliche DVS (Deutscher Verband für Schweißen und verwandte Verfahren) Richtlinie 2225-4 wird derzeit offenbar so ausgelegt, dass Materialien mit völlig unterschiedlichen Schmelze-Massefließrate miteinander verbunden werden können. Dies steht allerdings im grundlegenden Widerspruch zum Stand der Technik.
Die BAM wurde 2009 u. a. mit der Zulassung von Bewehrungsgittern für den Deponiebau beauftragt. Der Stand von Wissenschaft und Technik bot jedoch keine ausreichende Grundlage, die tatsächlich relevanten Widerstände und die mit diesen Widerständen verbundene Wechselwirkung zwischen Gitter und Boden im Hinblick auf eine mindestens 100-jährige Funktionsdauer realistisch beurteilen zu können. Es wurde daher nur eine vorläufige Zulassungsrichtlinie für diese Produkte erarbeitet. In der Zwischenzeit hat sich ein neuer Kenntnisstand ergeben. Vor diesem Hintergrund hat die AG (Arbeitsgruppe) Geogitter des Fachbeirats der BAM am 26.09.2017 getagt. Es sollen die aktuellen Erkenntnisse und Schlussfolgerungen für die Zulassung in Kürze vorgestellt werden. Die entsprechenden Kapitel beruhen dabei auf einem Arbeitspapier von W.W. Müller und dem Autoren, das der Arbeitsgruppe zur Diskussion vorgelegt wurde.
Weiterhin soll über Entwicklungen in Zusammenhang mit Kunststoffdichtungsbahnen (KDB) berichtet werden. Die Anforderungen an die Schweißzusätze für das Extrusionsschweißen wurden angepasst. Zudem soll über die aktuelle Diskussion der Schweißbarkeit unterschiedlicher HDPE Materialien informiert werden. Die maßgebliche DVS (Deutscher Verband für Schweißen und verwandte Verfahren) Richtlinie 2225-4 wird derzeit offenbar so ausgelegt, dass Materialien mit völlig unterschiedlichen Schmelze-Massefließrate miteinander verbunden werden können. Dies steht allerdings im grundlegenden Widerspruch zum Stand der Technik.
Recycling-Düngemittel auf Basis von sekundären Ressourcen (Gülle, Gärreste, Klärschlamm, Tiermehl etc.) gewinnen in den letzten Jahren zunehmend an Bedeutung in der Landwirtschaft. Die in den Recycling-Düngemitteln enthaltenen P-Spezies weichen oft stark von denen in konventionell hergestellten Düngemitteln aus Rohphosphat ab, zudem enthalten Recyclingdünger oft mehrere verschiedene P-Formen. Die Pflanzenverfügbarkeit des P in ist ganz wesentlich von der enthaltenen P-Form abhängig. Derzeit gibt es außer zeitaufwendigen und kostspieligen Gefäß- und Feldversuchen keine zufriedenstellende Testmethode zur Analyse der P-Pflanzenverfügbarkeit von unterschiedlichen Recycling P-Düngemitteln. Die im europäischen Düngemittelrecht normierten chemischen Extraktionsmethoden (Wasser, Zitronensäure, Ameisensäure, neutral Ammoniumcitrat etc.) zeigen oftmals keine oder nur sehr geringe Korrelation zu der P-Aufnahme von Pflanzen in Gefäßversuchen mit Recycling-Düngemitteln (Kratz et al. 2010, Steckenmesser et al. 2017, Vogel et al. 2017). Eine grundlegende Schwäche chemischer Extraktionsmethoden liegt darin, dass es sich dabei um statische Methoden handelt, die nicht in der Lage sind, die im System Boden/Düngemittel-Bodenlösung-Pflanze stattfindenden dynamischen Prozesse wie P-Freisetzung und Entzug durch die Pflanzenwurzeln abzubilden.
Einen Lösungsansatz bieten hier sog. P-Senken-Methoden. Bereits in den 1950er Jahren wurden erstmals P-Senken zur Analyse des Boden-P angewendet (Chardon et al. 1996). In den darauffolgenden Jahrzehnten wurden verschiedene P-Senken auf der Basis von Eisenoxid-Papier entwickelt (Chardon et al. 1996). Jedoch konnten diese Ansätze auch nur begrenzt zur Bestimmung der P-Pflanzenverfügbarkeit des Boden-P eingesetzt werden. Mitte der 1990er Jahre wurde die DGT (engl. diffusive gradients in thin films) Methode entwickelt (Zhang et al. 1998). Bei der DGT Methode diffundiert P aus der Bodenlösung des angefeuchteten Bodens durch einen Membranfilter und die Diffusionsschicht und wird anschließend an einer Bindungsschicht absorbiert. Durch den Diffusionsgradienten wird das Gleichgewicht in der Bodenlösung permanent gestört, wodurch auch labiles P im Boden gelöst wird. Die stetige Entnahme von P aus der Bodenlösung über die Diffusions-/Bindungsschicht simuliert dabei den Entzug von P durch die Pflanzenwurzel. Die an die Bindungsschicht adsorbierte Menge an P korreliert stark mit der P-Aufnahme von Pflanzen (u.a. Mason et al. 2005, 2013; Menzies et al. 2005, Six et al. 2012). Im Gegensatz zu chemischen Extraktionsmethoden werden bei der DGT Methode Mischungen an Düngemittel und Boden für mehrere Tage inkubiert (Vogel et al. 2017; Duboc et al. 2017), da ansonsten wasserlösliche P-Dünger den DGT Adsorber sättigen und wasserunlösliche P-Dünger unterschätzt werden. Ein bis zwei Wochen Inkubation sind ausreichend, damit sich pflanzenverfügbares P in die Mischungen bildet.
In letzter Zeit haben verschiedene Forschungsgruppen gezeigt, dass die DGT Methode auch eine sehr gute Korrelation mit der Pflanzenverfügbarkeit verschiedener Typen von (Recycling-)P-Düngemitteln aufweist (Vogel et al. 2017; Duboc et al. 2017; Foereid 2017; Haarstad and Bavor 2017; Lemming et al. 2017). Bei Gefäßversuchen mit verschiedenen Recycling P-Düngemitteln konnte die DGT Methode den Ertrag bzw. die P-Aufnahme von Mais deutlich besser vorhersagen als herkömmliche chemische Extraktionsmethoden (Vogel et al. 2017; Duboc et al. 2017).
Daher kann die DGT Methode im Vorfeld der Zulassung von neuen Düngermitteltypen als zuverlässige und robuste Methode zum Screening von Produktvarianten eines Düngemittelherstellers verwendet werden. Um dieses Messverfahren im Rahmen des Düngemittelrechts als Bewertungsinstrument für die Abschätzung der Pflanzenverfügbarkeit unterschiedlicher Düngemittel zu verwenden, muss es allerdings zunächst standardisiert werden. Zu diesem Zweck bietet sich der Einsatz eines „standardisierten“ Bodens bzw. Bodenrezepts an. Zur Kalibrierung der Methode im jeweiligen Labor könnten auch chemisch definierte P-Verbindungen mit bekannter Löslichkeit/Pflanzenverfügbarkeit als Referenz-substanzen verwendet werden.
Virologists. You might know a couple of them, but unless you are a virologist yourself, the probability that you have collaborated with one in the past is low. The community is relatively small, but they pack a heavy punch and are expected to play a leading role in the research into pathogens that lies ahead. You may ask why we think virologists are our future. Suffice it to say that it is not just because they have invented technologies that belong to the space age, including use of viruses as vehicles to shuttle genes into cells[1], organic nanoparticles with specific tools attached to their surfaces to get inside target cells[2], and using genetically modified viruses as therapies to fight against cancer[3]. Did you know that virologists currently only know of about 3,200 viral species but that more than 320,000 mammal-associated viruses[4] are thought to await discovery? Just think about the viruses hidden in the Arctic ice[5] or in the insects and other animals from once cut-off regions in the world, which now face ever-increasing human exposure[6]. But a heroic (as well as an apocalyptic) role for virologists may also be on the horizon, as the adoption of phage therapy may, in the future, be used to control harmful bacteria when antibiotics fail
Zukünftig werden vermehrt P-Recyclate auf den Düngemittelmarkt kommen. Diese müssen ausreichend charakterisiert werden, um Sicherheit und Wirksamkeit beurteilen zu können. Mit dem Vortrag wurde der wissenschaftliche Beirat für Düngungsfragen des Bundesministeriums für Ernährung und Landwirtschaft beraten.
Rare occurrences of termites in Germany. Termites are typical elements of the tropical and subtropical insect fauna. In Europe, their most northern natural range is southern France, Italy and the South-Balkan region. Only occasionally are termites found in Germany. Their occurrence is always very closely associated with the synanthropic environment. Drywood termites like Cryptotermes brevis or Kalotermis flavicollis were accidentally imported with furniture, wooden artefacts or plant material into homes or indoor arboretums. Similar pathways of termite introduction are described for Coptotermes gestroi and Reticulitermes sp. into tropical botanical gardens and tropical theme parks. Although termites were introduced to Germany several times, successful spreading or long term establishment never occurred due to climatic barriers, namely cold winter temperatures. Only Reticulitermes flavipes formed sustainable colonies in the city of Hamburg for several decades. Originating from the eastern United States of America, this species was introduced in the 1930s with infested wood through the sea port. Small subterranean colonies could survive the winter in areas where pipes of the central heating system kept the ground from freezing. Control efforts of this potentially invasive species of economic importance started early on but failed until modern bait techniques were applied in the year 2000. Currently, termites have not been detected in Hamburg for the last five years.
Second occurrence of aberrant antenna in house longhorn beetle Hylotrupes bajulus (Coleoptera: Cerambycidae) in the F3 generation. In 2016, the house longhorn beetle (Hylotrupes bajulus) breeding culture of the Federal Institute for Materials Research and Testing (BAM) in Berlin produced a second female beetle with a unique malformed right antenna similar to the one previously reported. As in the first case the flagellum following the pedical was bifurcated. This time, however, both branches were of similar length with 7 and 8 flagellomeres, respectively. The left antenna was normally developed with 11 antennal segments (scape, pedicel and 9 flagellomeres). This second female stands as F3-generation in direct maternal line to the previous one. A heritable cause for the malformation is likely.
A short natural and cultural history of the webbing clothes moth (Tineola bisselliella). It is generally accepted that the natural habitats of most pest insects can be found outside the synanthropic environment in layers of leaf litter, under bark, as well as in rodent or bird nests. Indeed, most of the common fabric pests have been reported as being facultative nidicolous. Therefore, infestation of commodities by pest insects out of these reservoirs is one possibility to be considered. However, the likelihood of a pest´s occurrence and survival outside of the synanthropic habitat largely depends on its ecological potential and competitiveness against other species of the same ecological guild. Some pest species are rarely found in wild habitats, especially in those regions where they are not native and where they have been introduced by man.
The fabric pest Tineola bisselliella serves as a good example. Most likely originating from Central or Southern Africa, this insect was introduced into Europe probably not earlier than the late 18th century. Being more tolerant to dry environments than other fabric pests, its economical importance increased during the 20th century when the indoor climate changed because of central heating systems. Its occurrence in outdoor natural habitats must be regarded as accidental. Reported finds of webbing clothes moth larvae in bird nests e. g. have been largely overstated in the literature. Tineola bisselliella should be regarded as an invasive and eusynanthropic species in most parts of the world.
A non-invasivemethod has been carried out to show the capabilities and limitations of Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS) for identifying of colourants and binders in modern reverse glass paintings. For this purpose, the reverse glass paintings “Zwei Frauen am Tisch” (1920–22), “Bäume” (1946) (both by Heinrich Campendonk), “Lofoten” (1933) (Edith Campendonk-van Leckwyck) and “Ohne Titel” (1954) (Marianne Uhlenhuth), were measured. In contrast to other techniques (e.g. panel and mural painting), the paint layers are applied in reverse succession. In multi-layered paint systems, the front paint layer may no longer be accessible. The work points out the different spectral appearance of a given substance (gypsum, basic lead white) in reverse glass paintings. However, inverted bands, band overlapping and derivative-shaped spectral features can be interpreted by comparing the spectra fromthe paintingswith spectra frompure powders and pigment/linseed oil mock-ups. Moreover, the work focuses on this method's capabilities in identifying synthetic organic pigments (SOP). Reference spectra of three common SOP (PG7, PY1, PR83) were obtained from powders and historical colour charts.We identified PR83 and PY1 in two reverse glass paintings, using the measured reference spectra. The recorded DRIFTS spectra of pure linseed oil, gum Arabic, mastic, polyvinyl acetate resin and bees wax can be used to classify the binding media of the measured paintings.
Zu den unerwünschten Gästen im Museum oder im Haushalt gehört zweifelsohne die Kleidermotte Tineola bisselliella. Es sind die Larven dieses Kleinschmetterlings, die die Schäden verursachen. Neben der konventionellen Schadensabwehr besteht die Möglichkeit, Schlupfwespen zur Bekämpfung der Larven einzusetzen. Der Vortrag rekonstruiert die Natur- und Kulturgeschichte der Kleidermotte anhand ökologischer Studien und historischen Indizien.
Derzeit gibt es intensive Diskussionen über die Entlassung von Deponien aus der Nachsorgephase. Die Deponie müsste dafür nach der Deponieverordnung (DepV) u. a. „insgesamt dauerhaft standsicher" sein. Geokunststoffe erfüllten ihre Funktion über einen Zeitrahmen von lediglich mindestens hundert Jahren. Dies stehe somit im Widerspruch wird argumentiert. Das neue LANUV-Arbeitsblatt 33 schließt daher im Moment eine Entlassung aus der Nachsorge von Deponien faktisch aus, wenn in den Böschungen Geokunststoffprodukte eingesetzt wurden. Auch der Fachbeirat der BAM zur Zulassung von Geokunststoffen, Polymeren und Dichtungskontrollsystemen hat sich daher mit der Thematik beschäftigt. Die aktuelle Situation soll daher auf dieser Grundlage diskutiert werden.
The possible impact of ultrafine particles from laser printers on human health is controversially discussed although there are persons reporting substantial symptoms in relation to these emissions. A randomized, single-blinded, cross-over experimental design with two exposure conditions (high-level and low-level exposure) was conducted with 23 healthy subjects, 14 subjects with mild asthma, and 15 persons reporting symptoms associated with laser printer emissions. To separate physiological and psychological effects, a secondary physiologically based categorization of susceptibility to particle effects was used. In line with results from physiological and biochemical assessments, we found no coherent, differential, or clinically relevant effects of different exposure conditions on subjective complaints and cognitive performance in terms of attention, short-term memory, and psychomotor performance. However, results regarding the psychological characteristics of participants and their situational perception confirm differences between the participants groups: Subjects reporting symptoms associated with laser printer emissions showed a higher psychological susceptibility for adverse reactions in line with previous results on persons with multiple chemical sensitivity or idiopathic environmental intolerance. In conclusion, acute psychological and cognitive effects of laser printer emissions were small and could be attributed only to different participant groups but not to differences in exposure conditions in terms of particle number concentrations.
Recent DNA-based studies have shown that the built environment is surprisingly rich in fungi. These indoor fungi – whether transient visitors or more persistent residents – may hold clues to the rising levels of human allergies and other medical and building-related health problems observed globally. The taxo¬nomic identity of these fungi is crucial in such pursuits. Molecular identification of the built mycobiome is no trivial undertaking, however, given the large number of unidentified, misidentified, and technically compromised fungal sequences in public sequence databases. In addition, the sequence metadata required to make informed taxonomic decisions – such as country and host/substrate of collection – are often lacking even from reference and ex-type sequences. Here we report on a taxonomic annotation workshop (April 10–11, 2017) organized at the James Hutton Institute/University of Aberdeen (UK) to facilitate reproducible studies of the built mycobiome. The 32 participants went through public fungal ITS bar¬code sequences related to the built mycobiome for taxonomic and nomenclatural correctness, technical quality, and metadata availability. A total of 19,508 changes – including 4,783 name changes, 14,121 metadata annotations, and the removal of 99 technically compromised sequences – were implemented in the UNITE database for molecular identification of fungi (https://unite.ut.ee/) and shared with a range of other databases and downstream resources. Among the genera that saw the largest number of changes were Penicillium, Talaromyces, Cladosporium, Acremonium, and Alternaria, all of them of significant importance in both culture-based and culture-independent surveys of the built environment.
Soiling of photovoltaic (PV) systems compromises their performance causing a significant power loss and demanding periodical cleaning actions. This phenomenon raises great concerns in the solar energy field, thus leading to notable research efforts over the last decades. Soiling is caused by a dual action of dust deposition and biofouling. However, surprisingly, the microbiological contribution to PV soiling is often overlooked or underestimated. In this study, a variety of qPCR-based methods have been developed to quantify the microbial load of fungi, bacteria and phototrophs on PV panels. These protocols were evaluated by comparison with culturedependent methods, and were implemented with real solar plants for two years. The results show that the developed molecular methods are highly sensitive and reliable to monitor the microbial component of the soiling. Fungal biomass was clearly dominant in all analysed PV modules, while bacteria and phototrophs showed much lower abundance. Light microscopy and qPCR results revealed that melanised microcolonial fungi and phototrophs are the main biofilm-forming microorganisms on the studied solar panels. In particular, the fungal qPCR protocol is proposed as a useful tool for monitoring of PV soiling, and investigating the microbial contribution to specific soiling cases.
Anregungen aus dem N.i.Ke.-Workshop 2017 und künftige Anforderungen. BEMMA steht für Bewertung von Emissionen aus Materialien für Museumsausstattungen. Es ist die Kurzbezeichnung für ein Schema/Verfahren zur Untersuchung und Bewertung flüchtiger organischer Verbindungen aus Werkstoffen, die im mittelbaren Kontakt mit historischen Materialien des Kunst- und Kulturgutes stehen. Hier wird der Status-Quo des Erreichten dargestellt. Wie wird das Schema in der Museumsöffentlichkeit wahrgenommen und seine Akzeptanz.
Normgerechte Ausführung resultiert in Qualität, aber sie ist nicht allein ein Garant auch für hohe Qualität. Hierfür sind begleitend immer auch nachgeordnete Richtlinien wie z. B. spezifische Gütekriterien zu erfüllen. Der Vortrag erklärt die Normungsarbeit auf nationaler und internationaler Ebene und schildert die Stärken aber auch die Schwächen bei der Erstellung von Normen. Dabei ist die Konsensbildung zwischen unterschiedlichen interessierten Kreisen mit deren Partikularinteressen oftmals ein Hindernis, das aber über Zusatzvereinbarungen und der Norm nachgeordneten Regeln überwunden werden kann.
BEMMA steht für Bewertung von Emissionen aus Materialien für Museumsausstattungen. Es ist die Kurzbezeichnung für ein Schema/Verfahren zur Untersuchung und Bewertung flüchtiger organischer Verbindungen aus Werkstoffen, die im mittelbaren Kontakt mit historischen Materialien des Kunst- und Kulturgutes stehen. Ergebnisse der Untersuchungen seit ca. 2010 bis 2017 werden präsentiert und diskutiert.
The present study shows the potential of high-resolution imaging and nano-Fourier-transform infrared (nano-FTIR) spectroscopy for corrosion science. The protective oxidation layers of different chlorine-gas treated silicon
carbides (SiCs) were characterized with these techniques. A nitrified SiC showed the highest resistant strength against chlorine corrosion at 1000 °C compared to the other SiCs. Nano-FTIR spectroscopy with a lateral resolution below 40 nm detected differences in the crystallinity of the bulk-SiC and in the transitional region to the protective layer. Furthermore, high-resolution imaging provides deep insight in the interfacial layer between bulk-SiC and the protective oxidation layer on sub-micrometer scale.
Chemical-free pest control by dielectric
heating with radio waves and microwaves:
Thermal effects
(2018)
Thermal pest control with hot air is widely accepted as an alternative to chemical methods. However, it requires relatively long treatment times owing to the low thermal conductivity of wood. Direct dielectric heating that applies radio waves or microwaves has the advantage of more homogeneous heating. However, Sound experimental data on this technique are currently rare. Therefore, the thermal treatment of wood-destroying insects with radio waves and microwaves was studied with two model pests, Anobium punctatum and Hylotrupes bajulus, and with Tenebrio molitor as a reference. The secure elimination of pests was achieved, and the corresponding treatment time was in the range of a few minutes. Temperature profiles were more homogeneous when applying radio waves.
A pot experiment was carried out with maize to determine the phosphorus (P) plant-availability of different secondary P-fertilizers derived from wastewater. We analyzed the respective soils by P K-edge X-ray absorption near-edge structure (XANES) spectroscopy to determine the P chemical forms that were present and determine the transformation processes. Macro- and micro-XANES spectroscopy were used to determine the chemical state of the overall soil P and identify P compounds in P-rich spots. Mainly organic P and/or P adsorbed on organic matter or other substrates were detected in unfertilized and fertilized soils. In addition, there were indications for the formation of ammonium phosphates in some fertilized soils. However, this effect was not seen in the maize yield of all P-fertilizers. The observed reactions between phosphate from secondary P-fertilizers and cofertilized nitrogen compounds should be further investigated. Formation of highly plant-available compounds such as ammonium phosphates could make secondary P-fertilizers more competitive to commercial phosphate rock-based fertilizers with positive effects on resources conservation.