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Organisationseinheit der BAM
- 4 Material und Umwelt (1130)
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- 4.0 Abteilungsleitung und andere (130)
- 6 Materialchemie (90)
- 1 Analytische Chemie; Referenzmaterialien (75)
- 6.1 Oberflächen- und Dünnschichtanalyse (35)
Paper des Monats
- ja (19)
Wie Länder mit ihren Abfällen umgehen, hängt nicht nur von der Wirtschaftskraft eines Landes ab. Selbst in einem reichen Land wie Australien werden unbehandelte Abfälle einfach deponiert. Im Rahmen der Travelling Conference, einer vom Bundesministerium für Bildung und Forschung (BMBF) geförderten Vortragsreihe, besuchten Fachleute die Länder Südkorea, Vietnam und Australien, um mit Experten vor Ort Fragestellungen aus der Abfallwirtschaft zu diskutieren. Zu den Schwerpunktthemen zählte die Steigerung der Ressourceneffizienz im Spannungsfeld von ökonomischen und umweltpolitischen Interessen. Eine Frage war beispielsweise die Bewertung der Umweltverträglichkeit von mineralischen Abfällen, wenn diese als Ersatzbaustoffe eingesetzt werden. In diesem Beitrag werden Ähnlichkeiten und Unterschiede bei der Entsorgung von Siedlungsabfällen, beim Recycling und bei der Bewertung der Umweltverträglichkeit der Wiederverwertung von Abfällen in den drei besuchten Ländern im Vergleich zu Deutschland aufgezeigt. Dabei ist man sich in Deutschland und den drei besuchten Ländern einig, dass die Abfallbeseitigung auf Deponien ohne Rückgewinnung von Ressourcen oder Energie die schlechteste Abfallentsorgungsoption ist. Einigkeit besteht auch darin, dass die Ziele einer nachhaltigen Abfallwirtschaft der Schutz der menschlichen Gesundheit und der Umwelt sowie die Schonung von Ressourcen sind. In allen drei Ländern werden große Mengen an mineralischen Abfällen erzeugt, die bei Nachweis der Umweltverträglichkeit einen Teil von natürlichem Sand und Kies für die Bauindustrie ersetzen könnten. Ähnlich wie in Deutschland werden recycelte Abfälle im Tiefbau jedoch nur in geringem Maße eingesetzt. Gründe dafür sind fehlende Behandlungsanlagen für mineralische Abfälle und Bedenken im Hinblick auf die Umweltverträglichkeit.
A new sewage sludge ordinance was set in force in Germany in 2017 that makes phosphorus recovery from sewage sludge mandatory. The technological possibilities for P-recovery from waste water, sewage sludge and sewage sludge ash were presented.
Normativ ist der Holzschutz in Deutschland durch die DIN 68800-Reihe geregelt. Die Normungsarbeit in CEN/TC 38 bildet dafür den Rahmen, der national angepasst und fachspezifisch erweitert wurde. Zusammen mit dem Kommentar ergeben beide ein in Europa einzigartiges Regelkompendium im Holzschutz. In Zukunft wird die Regelsetzung noch stärker durch internationale Zusammenarbeit bestimmt sein. Der interkontinentalen Marktöffnung sollten Verständigungen auf gemeinsame Qualitätsstandards vorausgehen.
The Cairo Geniza is an “archive” discovered in the 19th century in Ben Ezra Synagogue in Fustat, a district in Old Cairo (Egypt). The collection of mostly Jewish documents that vary in genres, languages and writing supports contains a large number of early medieval Hebrew manuscripts.
The Geniza provides sources for the literary, linguistic, historical studies of the various aspects Jewish life. As the documents attest, at least two Jewish communities co-existed in Fustat up to 11th century: a so-called Babylonian and Palestinian. These communities had different leaders, different traditions and lived independently. The differences seem to manifest themselves also in the paleographical, codicological and some material properties of the manuscripts produced by each community.
The aim of this project is to compare the inks used in the Jewish documents depending on different variables: support (paper, parchment), purpose of the manuscript (legal, private, religious), provenance of the scribe. For the determination of the inks type and composition we had to choose non-invasive, non-destructive and portable techniques to analyze the corpus directly on-situ.
The analyses were carried out with a micro-X-ray spectrometer ArtTAX® (Bruker GmbH) and a digital stereomicroscope features built-in LED illumination at 395 nm and 940nm, Dino Lite.
We would like to stress that though the methods of material analysis listed above have been successfully employed in the field of cultural heritage and conservation including ancient and medieval manuscripts they have not yet been used to study fragments from the Cairo Genizah. Therefore, we believe that this research project is a pioneering study that will provide new insights into the history of Hebrew writing materials, their production techniques and materials and, thus, contribute new data to the field of Hebrew paleography.
L'archéométrie est une discipline riche qui peut nous apporter beaucoup d'informations sur l'étude des manuscrits et qui, conjuguée à la paléographie et la codicologie, peut s'apporter un outil précieux pour mieux appréhender les sociétés qui ont produits ces manuscrits.
Nous verrons ici quelques exemples de techniques scientifiques non destructives, principalement appliqués à la Génizah du Caire, appliquées à l'étude des manuscrits.
The technique of painting on the reverse side of a glass panel was rediscovered by German artists at the beginning of the 20th century. They appreciated the impressive gloss, luminosity, and depth of colours in this genre. Compared to stained glass, the distinctive properties of this technique are: (1) the paint is applied “cold”, hence, it doesn’t involve a firing step, (2) reverse paintings on glass are framed and always viewed in reflected light and (3) the reverse paint stratigraphy is different from canvas paintings, starting with the front most layer and ending with the backing layer. In 1908 several artists, including Gabriele Münter, Wassily Kandinsky, Heinrich Campendonk, August Macke and Franz Marc of the “Der Blaue Reiter” (the Blue Rider) collective took an interest in this technique and started to share their interest with other colleagues in Europe. Our pioneering project is tracing this transfer of knowledge by a multidisciplinary approach in terms of art history, paint technology and material science. More than 100 artists and >1000 reverse paintings on glass were identified during the project. This high number of objects clearly points out that this technique was by far more important for modern art than previously assumed. In-situ, non-invasive measurements (XRF, Raman, VIS, DRIFTS) on a well-considered selection of 67 paintings reveal the broad palette of colorants ranging from traditional to experimental. Special attention is paid to the impact of synthetic organic pigments (SOP) in artists palette. Demonstrative examples by W. Kandinsky, L. G. Buchheim and F. Jespers are used to discuss analytical challenges and highlights.
Near-ambient pressure XPS makes it possible to characterise samples not compatible to ultra-high vacuum, and enables the study of liquid-solid, gas-liquid and gas-solid interfaces. NAP-XPS meas-urements of biofilms, suspended nanoparticles and metal-organic frameworks were performed with EnviroESCA developed by SPECS.
An interesting application is surface characterisation of biofilms, which are bacterial communities embedded in a self-produced polysaccharide matrix. Various model systems ranging from pure polysaccharides of alginate to biofilms harvested directly from the growth medium have been char-acterised in humid conditions[1].
NAP-XPS also makes it possible to characterise nanoparticles in solution. Silver nanoparticles in aqueous solution were characterised and the Ag 3d-spectrum compared to spectra obtained of dried nanoparticles in UHV-conditions[2]. The binding energy of the Ag 3d-core level peak was shifted by 0,6 eV towards higher binding energy for suspended nanoparticles compared to the dried sample measured in UHV. This can be assigned to a change in surface potential at the water-nanoparticle interface.
Metal-organic frameworks (MOFs) are suitable materials for gas storage of small molecules due to their nanoporous, crystalline structure. However, instability in humidity remains an issue for many types of MOFs. XPS-measurements of the MOF-structure HKUST-1 were performed in various NAP-conditions to assess the stability of the sample and its interaction with the gas molecules as water, methanol and pyridine.
In Goethes naturwissenschaftlichen Sammlungen, die als Arbeits- und Studiensammlungen, zum Teil aber auch als Lehrsammlung für den Sohn August angelegt sind, haben sich sowohl die eigentlichen Sammlungsobjekte als auch deren vermeintlich ursprünglichen Kontexte durch Beschriftungen, Etiketten und in Teilen noch existierende Präsentationsmedien erhalten. Es stellt sich jedoch die grundsätzliche Frage nach deren Ursprünglichkeit. Präsentieren sich die Objekte noch so wie zur Goethezeit oder erfuhren die historischen Dichotomien im Laufe der Zeit Veränderungen, sodass die zeitgenössischen Präsentationsformen und die damit verbundenen didaktischen Funktionen heute nicht mehr lesbar sind?
Tantalum and niobium are essential for the development of electronics towards a more and more compact design, but without reducing their performance today. Especially in smart phones and tablets, tantalum and niobium capacitors with high charge densities have already become almost indispensable. However, tantalum as a critical raw material is still a problem for the sustainable production of electronics. Due to this fact, the existence of efficient recycling processes especially in Europe is becoming even more important nowadays.
The Bundesanstalt für Materialforschung und -prüfung (BAM) is currently working on the optimisation of an existing pyrometallurgical tantalum recycling process. Optimisation of this industrial process is carried out in a small-scale electric arc furnace (480 kVA, capacity approx. 150 kg/h) at BAM using a new and innovative equipment for on-line analysis of high temperature processes.
The aim of this project is to identify the best timing for an optimum slag tapping, when the slag is lower than minimum targeted tantalum concentration. Hence, LIBS (Laser induced breakdown spectroscopy) is used to identify the chemical composition of the slag layer and during slag tapping. The on-line-LIBS prototype of BAM enables an in-situ measurement of the element distribution in the melt after calibration on the slag system.
First results of this joint research project will be presented including LIBS-measurements and thermodynamic and kinetic aspects of the process.
Z02 is one of the three technically supporting projects at the Centre for the Study of Manuscript Cultures (CSMC). In collaboration with the other two service projects, Z01 and Z03, it aims at bridging the gap between humanities and natural sciences and technology. To that purpose, we set up a laboratory with a range of high-end instruments, most of them mobile, allowing thorough non-destructive analysis of manuscripts. In addition to working on constantly improving the laboratory and the methods of analysis, a substantial part of our activities is dedicated to service, by supporting different research projects conducted at the centre. In this talk, we will present our equipment and the possibilities offered by the different techniques available regarding the different kinds of missions: typology and classification of inks, provenance studies, recovery of faded inscriptions and palimpsests, reconstruction of the history of manuscripts, authentication and dating. We will give a brief overview of our past and ongoing activities in the frame of the second phase of the CSMC. Finally, a selection of projects will be presented in greater detail to highlight the possibilities of our laboratory and the diversity of missions which can be carried out.
In addition to previously reported results on the simulated aging of polystyrene samples (PS) containing 1 wt. % hexabromocyclododecane (HBCD), we present the first results of our investigations of polypropylene (PP)-samples containing 0.1 wt. % BDE-209. All studied polymer samples were exposed to a defined weathering schedule in a climate chamber in accordance to regulation EN ISO 4892-3:2006.For the determination of BDE-209 in the collected rain water samples derived from the used climate chamber, the samples were prepared in accordance with a validated protocol. Before the analyses, each sample was spiked with 2 µL of isotopically labeled BDE-209 (13C10-BDE-209) to serve as internal standard (ISTD) in the performed stable isotope dilution analysis. Subsequently the samples were extracted with isooctane, the obtained aliquots of the extracts were concentrated to 200 µL and 2 µL of the resulting solution were injected to the GC/MS for quantification.
Additionally, the total bromine contents are monitored for the aged and untreated samples using laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) as well as X-ray fluorescence analysis (XRF) as non-destructive and rapid method. Furthermore, results from surface analysis using environmental scanning electron microscopy (ESEM) for morphological characterization of the aged and untreated samples were presented and discussed. In general, the resulting data from the accelerated aging will be compared to those from the natural weathering experiments (“atmospheric exposure”, in soil).
The atmospheric exposure was performed by placing the samples on a weathering rack, which is aligned in SW direction (in a 45° angle to the horizon). The weathering data were regularly recorded by Deutscher Wetterdienst at this site. The surfaces of the test specimens (aged and stored references) were analyzed by ESEM as well as by LA-ICP-MS and by XRF. The surface of PS and PP specimens aged outdoors present the aging under real conditions and allow the comparison to the accelerated aged specimens by means of the weathering chamber. This way, we explore the efficiency of the accelerated aging procedure, which provides the advantage of well-defined and reproducible conditions compared to natural weathering, as a tool for testing different plastic materials.
Additionally “in soil” experiments were conducted in-door in a well characterized testing soil. The soil (boulder-clay, sand with 12 % loam, particle size in total 0.2-4 mm) is filled in a free-draining concrete basin inside of an air-conditioned room. In this manner, TOC, water capacity and humidity are recorded parameters. To assure a washing out process from the samples by the raining water, the target water content is calculated to 8%. The actual humidity is measured by a tensiometer, assuring the duration of the raining period. The water content is additionally monitored by weight of the basin, capturing water from raining periods. The correct humidity is a fundamental parameter for biological activity. Samples of PS resp. PP were of dimension 10x1cm and 5 specimens were placed up to the half in the soil per basin. Microbial activity of the soil, monitored by the reference polyurethane, sets HBCD resp. BDE-209 of the samples free and will be leached from the samples by raining water. Thereafter these will be captured by passive samplers placed in a distinct distance to the samples in the soil. The “in soil” experiments are complementary to the weathering experiments due to the biological activity in the soil. These experiments simulate the fate of the brominated flame retardants in the biosphere.
Environmental sustainability and –stability of Materials concerning the Migration of pollutants
(2018)
MaUS is an acronym for ”Material und Umweltsimulationen“. Plastics are in the focus of environmental politics due to their long-term behaviour and therefore to their persistence. Not only that they appear as visible contaminants in the sea and on the beach, but their unknown behaviour concerning their additives as well as the related transformation products are anxious. Therefore, we wish to establish a certified reference method to provide a method for testing plastics.
Aim of this project is the development of fast motion standard reference methods for testing plastics regarding to their environmental compatibility. To establish these testing methods, we use polystyrene (PS) and polypropylene (PP) with environmental relevant brominated flame retardants, known for their persistent bioaccumulative and toxic (PBT) properties. In case of PS the material contains 1 wt% of 1,2,5,6,9,10-hexabromocyclododecan (HBCD) and in case of PP 0.1 wt% bromodiphenylether (BDE-209), which is known as a substance of very high concern (SVHC). Furthermore, we use polycarbonate (PC), which is still used as material in baby flasks and releases Bisphenol A (BPA), an estrogenic active substance.
As an additional material PTFE is used for its importance as a source for two ubiquitous environmental substances (PFOS and PFOA), whose toxicological effects are still incompletely known.
The focus in this current work is set on the transfer of potential pollutants out of applied materials mentioned above into environmental compartments like water or soil. Here an accelerated aging concept should be developed to shortened time consuming natural processes. For these resulting simulations we use a programmable weathering chamber with dry and wet periods and with high and low temperatures. These programmes run for several weeks and according to a defined sampling schedule we take water samples, run a clean-up procedure by SPE (Molecular imprinted polymers (MiPs) resp. polymer-based cartridges (Waters Oasis HLB)) and analyse them by HPLC-UV resp. LC-MS/MS. Of most interest in case of flame retardants are photocatalytic transformation products. Therefore, we conduct a non-target-screening resp. a suspected target-screening by LC-MS/MS and HRMS.
Gegenstand des Projekts ist die Prüfung der Umweltbeständigkeit und -verträglichkeit von Materialien und Produkten hinsichtlich der Emission von potenziellen Schadstoffen in die Umwelt. Hierzu werden chemisch-physikalische Einflüsse (Bewitterung) und mikrobielle Beanspruchungen an Modellmaterialien evaluiert. So werden die Freisetzungsraten von Schadstoffen in Abhängigkeit der Beanspruchung beschrieben. Als Modellmaterialien kommen die Polymere Polycarbonat, Polytetrafluorethylen, Polystyrol und Polypropylen zum Einsatz. Synergistische Effekte der Bewitterungsparameter und der mikrobiologischen Beanspruchung sollen dabei ebenso betrachtet werden, wie die gezielte Alterung. Auch findet eine Beschreibung des Verhaltens der ausgetragenen Schadstoffe in den Umweltkompartimenten Boden oder Wasser statt. Hier sind mit Hilfe der zu entwickelnden Screening- und non-Target-Analyseverfahren die Transformation und der Metabolismus durch Mikroorganismen zu beschreiben. Aus den Ergebnissen sollen Korrelationen zwischen den künstlichen Alterungsverfahren und realen Szenarien abgeleitet werden, die es gestatten, Schnellprüfverfahren zu etablieren, die die Simulation der realen Beanspruchungen im Zeitraffermodell anwendbar machen. Somit sollen standardisierbare Schnellbeanspruchungs-verfahren erarbeitet werden, die als Prüfeinrichtungen etabliert werden und von externen Auftraggebern zur Prüfung der Umweltbeständigkeit und -verträglichkeit von neuen Materialien genutzt werden können. Die Umweltwirkungen (chemisch-physikalisch und mikrobiologisch) sollen so definiert eingesetzt werden, dass eine reproduzierbare Prüfung möglich wird. Aus diesen Verfahren und Methoden sollen Normen abgeleitet werden, die eine standardisierte Materialprüfung ermöglichen.
Gemeiner Nagekäfer und Kleidermotte sind unerwünscht im Museum. Kulturgüter mit Anteilen von Holz, Federn, Wolle, Haare, etc. wie ethnologische oder naturkundliche Sammlungsstücke, aber auch Bilderahmen oder Freilichtmuseen werden von ihnen gerne besucht. Dabei sind es die Jugendstadien (Larven) dieser Insekten, die sich von ungeschützten Exponaten oder Depotstücken, die diese natürlichen Materialien enthalten, ernähren. Die Entwicklung der Larven findet verborgen im Inneren der Materialien statt. Die geflügelten erwachsenen Formen, die sich im freien Raum bewegen, sich fortpflanzen und den Neubefall herbeiführen, treten saisonal sehr begrenzt auf. Eine frühzeitige Detektion der Schädlinge, als erwachsenes Insekt oder als Larve, ist dadurch erschwert. Es gilt folglich deren Präsenz und erste Anzeichen eines Befalls zuverlässig und vor allem frühzeitig feststellen zu können, um geeignete Maßnahmen zum Schutz des Kulturgutes einzuleiten.
Neben dem Wissen um die Materialeigenschaften des Kulturgutes sind umfängliche Kenntnis über die Biologie der Schädlinge, zu ihren grundsätzlichen Lebensansprüchen und insbesondere zum Verhalten, das zum Neubefall führt, wichtig. Die Larvenstadien von Holz- und Textilschädlingen zeichnen sich durch hohe Toleranzen gegenüber extremen Temperaturen und Luftfeuchten aus. Für sie ungünstige Bedingungen können sie sehr lange in Ruhephasen überdauern. Nicht erkannter, versteckter Befall von Materialien sind häufige Infektionsquellen für Neubefall von Sammlungen. Verborgene natürliche Befallsquellen im eigenen Museumssystem spielen bei Neubefall von Exponaten eine größere Rolle als der Zuflug von Schadinsekten aus Reservoiren von außen.
Der Vortrag stellt beispielhaft Lebenszyklen relevanter Schädlingsarten vor und zeigt Möglichkeiten gezielter Interventionen auf, die in ein IPM Konzept einfließen können. Dies umfasst vorbeugende Maßnahmen wie geeignetes Klima in Ausstellungs- und Lagerräumen, das sogenannte Monitorring sowie eine konsequente Quarantäne bis hin zu physikalischen, biologischen oder chemischen Bekämpfungsmaßnahmen.
Long Term Temperature and Humidity Evolution Forecast in Near Field of Nuclear Waste Container
(2018)
The paper aims to simulate the corrosion environment of nuclear waste containers at different geological disposal periods to obtain temperature and humidity information at the interface between the container and the surrounding environment. The simulated data and calculation results of long term temperature evolution at the surface of nuclear waste (HLW) containers from some typical nuclear countries about the safety disposition were reviewed. Combining different burial patterns, this paper speculated the long term temperature evolution rule for China. According to the study about saturation variation of buffer/backfill material at home and abroad, the humidity evolution of bentonite at the surface of HLW containers was specu- lated. The study showed that the temperature of the container surface increased rapidly at the beginning, and gradually decreased after the climax. For safety reasons, the maximum temperature was designed below 100°C. The saturation of bentonite was af- fected by the mutual influences of the heat released by nuclear waste decay and the infiltration of groundwater. It was dominated by the released heat in the early stage, and later was influenced greatly by the infiltration of groundwater. It is generally believed that the water content at the surface of the container will increase obviously in about 3 years, and will be saturated in about 10 years. The prediction of long-term temperature and humidity evolution will lay a foundation for study of corrosion evolution of nuclear waste containers in China.
Surface environment changes of nuclear waste container, mainly including oxygen contents, buffer pore water components and pH under the conditions of “borehole” type and “In-floor” type with bentonite buffer/backfill and concrete buffer were summarized. This summarization provides a basic corrosion environment reference for the corrosion evolution re- search of high-level radioactive waste disposal repository in our country.