TY - CONF A1 - Kraft, S. A1 - Böttcher, Katrin A1 - Bonse, Jörn A1 - Schille, J. A1 - Löschner, U. A1 - Krüger, Jörg T1 - Unwanted X-ray emission in ultrashort pulse laser processing: From metallic to biological materials N2 - X-rays can be generated as an unwanted side effect during ultrashort pulse laser material processing of technical work pieces and even biological samples with laser intensities above 10^13 W/cm^2. First studies demonstrate the need to address this effect in industrial as well as in medical applications. This secondary hazard should be considered in work safety and risk assessment. T2 - Lasers in Manufacturing 2023 (LiM 2023) CY - Munich, Germany DA - 26.06.2023 KW - Ultrashort pulse laser processing KW - Laser-induced X-ray emission KW - Secondary hazard PY - 2023 SP - LiM 2023 - 1 EP - LiM 2023 - 6 PB - Wissenschaftliche Gesellschaft Lasertechnik und Photonik e.V. (WLT) AN - OPUS4-58358 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Krüger, Oliver A1 - Kalbe, Ute A1 - Berger, Wolfgang A1 - Simon, Franz-Georg A1 - López Meza, S. T1 - Leaching experiments on the release of heavy metals and PAH from C&D waste and MSWI bottom ash N2 - Leaching tests are fundamental tools for the assessment of long-term impact of contaminated waste materials on the soil-groundwater pathway. Waste materials should be tested under conditions equal to their actual application in re-use scenarios to achieve reliable results. Since the standards for leaching procedures available on international level so far are either not validated or considered inadequate in respect to coarse grained materials, new standards had to be developed. Therefore column percolation and batch test procedures have been standardized and validated to enable their introduction to new German regulations concerning waste management. Practical aspects of the test procedures as well as the boundary conditions compared to the already existing standards will be described. Examples including round robin test results will be given to justify the selection of the new specifications. T2 - 2nd International conference on hazardous and industrial waste management CY - Chania, Crete, Greece DA - 2010-10-05 KW - Leaching KW - Bioavailability KW - Column tests KW - Batch tests PY - 2010 IS - Session A, A5.1. SP - 1 EP - 8 AN - OPUS4-22128 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Kalbe, Ute A1 - Krüger, Oliver A1 - Wachtendorf, Volker A1 - Berger, Wolfgang A1 - Hally, S. T1 - Development of leaching procedures for synthetic turf systems containing scrap tyre granules N2 - Scrap tyres are widely reused in the form of granules as infill materials or component of sub-base layers in construction of sporting grounds such as synthetic turf areas and athletic track surfaces. The recycled rubber may contain organic and inorganic pollutants due to the presence of vulcanisation catalysts, stabilisers and other additives which can be released into soil and groundwater in the case of outdoor sports facilities. In order to evaluate the amount of potentially mobile pollutants, leaching tests can be employed. This study aimed particularly at the investigation of the feasibility of column tests using complete synthetic surface flooring or turf system assemblies. The release of zinc and polycyclic aromatic hydrocarbons (PAH) leached from components of sports surfaces containing recycled rubber granules was considered. Additionally, batch tests on coated and uncoated styrene butadiene rubber (SBR) granules aged by artificial weathering were performed to indicate its possible influence on the leaching behaviour of zinc and PAH. The chosen approach of column tests simulating typical complete synthetic sports surface installations has been proven to be feasible and robust. The time-dependent leaching behaviour and interactions between single components can be evaluated by column tests. Zinc was the most relevant contaminant in the eluates and its leachability was enhanced after accelerated ageing by artificial weathering. Leachable PAH were found in relatively low but well detectable amounts which increase by ageing as well. KW - Waste rubber KW - SBR KW - Artificial turf KW - Leaching KW - behaviour KW - Column test KW - Batch test KW - Weathering PY - 2013 DO - https://doi.org/10.1007/s12649-013-9248-5 SN - 1877-2641 SN - 1877-265X VL - 4 IS - 4 SP - 745 EP - 757 PB - Springer Science + Business Media CY - Dordrecht AN - OPUS4-29454 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Berger, Wolfgang A1 - Kalbe, Ute A1 - Krüger, Oliver A1 - Hennecke, D. A1 - Hoffe, S. T1 - Validierung des Schüttelverfahrens DIN 19527 für organische Schadstoffe N2 - Die im Jahre 1999 in Kraft getretene Bundes-Bodenschutz- und Altlastenverordnung (BBodSchV) befindet sich gegenwärtig in der Phase der Novellierung. Darüber hinaus ist die Einführung einer Ersatzbaustoffverordnung zur Verwertung mineralischer Abfälle vorgesehen. Beide Verordnungen erfordern für eine Gefahrenbeurteilung Prüfwerte, die auf der Grundlage validierter Elutionsverfahren hergeleitet sind. Im DIN-Normenausschuss NA 119-01-02-05 UA „Elutionsverfahren“ wurden Anfang 2009 zwei Normen zur Elution von Feststoffen verabschiedet. DIN 19528 beinhaltet ein Säulenverfahren zur grundlegenden Charakterisierung und für die Übereinstimmungsuntersuchung sowohl für anorganische Stoffe als auch für organische Stoffe (nur polyzyklische aromatische Kohlenwasserstoffe - PAK) und DIN 19529 ein Schüttelverfahren für anorganische Stoffe mit einem Wasser- Feststoffverhältnis von 2 l/kg. Beide Normen wurden auf der Grundlage von Ringversuchen validiert. Die Diskussion zur Erarbeitung eines Schüttelverfahrens für organische Stoffe verlief zunächst äußerst konträr. Auf Initiative von Kördel wurde zur Erarbeitung von E DIN 19527 (Schüttelverfahren für organische Stoffe mit einem Wasser-/Feststoffverhältnis von 2 l/kg) ein Ringversuch organisiert, bei dem zwar unterschiedliche Bodenarten Berücksichtigung fanden, die organischen Schadstoffe aber auf PAK beschränkt blieben. In einem Forschungsvorhaben zur Bewertung der Robustheit von E DIN 19527 zeigte sich, dass eine einfache Übertragung der Ergebnisse mit PAK-belasteten Böden auf andere Schadstoffgruppen nicht ohne Weiteres möglich ist. Für beide o. g. Verordnungen war es somit erforderlich, das Schüttelverfahren auch für weitere prioritäre organische Schadstoffgruppen wie Mineralölkohlenwasserstoffe (MKW), polychlorierte Biphenyle (PCB) und Phenole in Böden und Bodenmaterialien zu validieren. In diesem Beitrag werden die Ergebnisse von Ringversuchen zur Validierung von DIN 19527 vorgestellt, bei denen zwei unterschiedliche mit prioritären organischen Schadstoffen kontaminierte Böden/Bodenmaterialien eingesetzt wurden. PY - 2013 DO - https://doi.org/10.37307/j.1864-8371.2013.01.04 SN - 0942-3818 SN - 1864-8371 IS - 1 SP - 5 EP - 8 PB - Erich Schmidt Verlag CY - Berlin AN - OPUS4-27786 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Krüger, Oliver A1 - Kalbe, Ute A1 - Meißner, K. A1 - Sobottka, S. T1 - Sorption effects interfering with the analysis of polycyclic aromatic hydrocarbons (PAH) in aqueous samples N2 - Polycyclic aromatic hydrocarbons (PAH) are severe environmental pollutants that are analyzed frequently. The risk assessment of PAH impact to groundwater can be performed using leaching tests. Therby a liquid–solid separation step including centrifugation may be required, which in turn might lead to loss of analytes due to sorption on the equipment. Thus we determined the PAH recoveries from various container materials (polyethylene (PE), polypropylene (PP), polytetraflourethylene (PTFE), stainless steel (ES), and perflouroalkoxy (PFA)) and compared them to selected PAH properties. We found the best recoveries for PFA (68%) and PTFE (65%) containers. We found good negative correlations (-0.93 and better) between PAH recovery and log partition coefficient organic carbon–water (log KOC) for PFA, PTFE, and ES containers. KW - PAH recoveries KW - Sorption KW - Plastic surfaces KW - Centrifuge containers PY - 2014 DO - https://doi.org/10.1016/j.talanta.2014.01.038 SN - 0039-9140 VL - 122 SP - 151 EP - 156 PB - Elsevier B.V. CY - Amsterdam AN - OPUS4-31383 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - RPRT A1 - Berger, Wolfgang A1 - Kalbe, Ute A1 - Krüger, Oliver A1 - Hennecke, D. A1 - Hoffe, S. T1 - Validierungsringversuche für E DIN 19527 Elution von Feststoffen - Schüttelverfahren zur Untersuchung des Elutionsverhaltens von organischen Stoffen mit einem Wasser/ Feststoff-Verhältnis von 2 l/kg für Boden- und andere geeignete Materialien N2 - Für die vom Bundesumweltministerium vorgesehene Mantelverordnung sind validierte Unter-suchungsmethoden erforderlich. Dazu gehört auch die Herstellung von wässrigen Eluaten, z.B. zur Beurteilung der Mobilität von Schadstoffen und der Ableitung von Grenzwerten. Ziel des Vorhabens war es, auf der Grundlage geeigneter Testmaterialien (mit prioritären organischen Schadstoffen kontaminierte Böden und Bodenmaterialien) Ringversuche zur Validierung des Schüttelverfahrens nach E DIN 19527 und des Säulenverfahrens für die Übereinstimmungs-untersuchung nach DIN 19528 durchzuführen. Auf der Grundlage der Untersuchungsergebnisse sollten beide Normen bezüglich der Vorgehensweise präzisiert werden und es sollten die während des Ringversuchs ermittelten Verfahrenskenndatenn zur Validierung der Normen herangezogen werden. Darüber hinaus sollten Säulen- und Schüttelverfahren als Übereinstimmungstest vergleichend bewertet werden. Es wurden vier geeignete Ringversuchsmaterialien hergestellt und an insgesamt 18 Ringversuchsteilnehmer ausgegeben. Die Auswertung der Ringversuche erfolgte auf der Grundlage klassischer Statistik nach DIN ISO 5725 mit Hilfe der AuswertesoftwareProLab 2011 (quo data). Auf der Grundlage der Validierungsringversuche wurden die Verfahrenskenndaten für die Norm DIN 19527 ermittelt. Die statistische Auswertung der eingereichten Datensätze war aufgrund der großen Streubreite der Daten schwierig. Die vorgeschriebenen statistischen Methoden zur Datenauswertung adressieren die Behandlung nicht gleichverteilter Datensätze nur ungenügend. Das muss bei der Bewertung der Ergebnisse und deren Zuverlässigkeit berücksichtigt werden. Generell kann festgestellt werden, dass keine signifikanten Unterschiede zwischen den Ergebnissen der Schüttel- und Säulenelution beobachtet werden. Dabei werden beim Schüttelverfahren tendenziell etwas geringere Gesamtmittelwerte erzielt als beim Säulenverfahren, die berechneten Vergleichsvariationskoeffizienten sind für das Schüttelverfahren meist etwas niedriger. Dennoch erweisen sich beide Elutionsverfahren bei den eingesetzten Ringversuchsmaterialien als gut vergleichbar. N2 - Validated investigation methods are required for the drafted decree, called “Mantelverordnung”, comprising the amendment of the Federal Ordinance on Soil Protection and Contaminated Sites, the Federal Ordinance on Mineral Waste Utilization and Groundwater Ordinance published by the German Federal Ministry for the Environment, Nature Conservation and Nuclear Safety in January 2011. These methods include such for the creation of aqueous eluates, which contribute to the evaluation of the mobility of pollutants and the derivation of threshold values. Objectives of the R&D project were interlaboratory tests for the validation of the batch test (E DIN 19527) and the column test using the compliance test option according to DIN 19528 based on contaminated soil test materials with organic pollutants of high priority. Dependent on the test results both standards should be specified concerning the experimental details. Furthermore, the standards shall be validated using the determined performance characteristics. The comparability of column and batch test procedures as compliance tests shall be evaluated in addition. Four appropriate test materials were prepared from two different types of soils, each with the pollutant combinations PAH/PCB and Phenols/TPH/PAH, respectively. These materials were delivered along with test solutions to 18 participants of the interlaboratory comparision. The evaluation of the interlaboratory comparison was carried out on the basis of classical statistics according to DIN ISO 5725. The software ProLab 2011 (quodata) was used for the evaluation. The performance characteristic parameters for the standard DIN 19527 were determined on the basis of the interlaboratory tests. The main challenge was the statistical evaluation due to the fact that the common statistical procedures do not address the evaluation of nonuniformly distributed datasets. This must be considered for the assessment of the results and reliability of the conclusions. However, on a more general level it can be concluded that no significant differences between the batch and column percolation test procedure were observed. The total mean values determined by batch tests tend to be slightly below the values from column tests. The between labvariation coefficients representing the reproducibility of the methods follow the same trend. All in all both methods can be assessed to be equivalent using the materials tested. KW - Kontaminierter Boden KW - PAK KW - PCB KW - MKW KW - Phenole KW - Elutionsverfahren KW - Schütteltest KW - Säulenversuch KW - Validierungsringversuche PY - 2012 SP - 1 EP - 189 AN - OPUS4-53610 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Bonse, Jörn A1 - Bachelier, G. A1 - Wiggins, S. M. A1 - Siegel, J. A1 - Solis, J. A1 - Krüger, Jörg A1 - Sturm, Heinz T1 - Femtosecond laser ablation of indium phosphide in air: dynamical, structural and morphological evolution N2 - The irradiation of single-crystalline indium phosphide (c-InP) by Ti:sapphire femtosecond laser pulses (130 fs, 800 nm) in air is studied by means of in-situ time resolved reflectivity measurements [fs-time-resolved microscopy (100 fs-10 ns) and point probing analysis (ns - µs)] and by complementary ex-situ surface analytical methods (Micro Raman Spectroscopy, Scanning Force, and Optical Microscopy). The dynamics of melting, ablation, and optical breakdown as well as structural changes resulting from rapid solidification are investigated in detail. Different laser-induced surface morphologies are characterized and discussed on the basis of recent ablation and optical breakdown models. KW - Femtosecond laser ablation KW - Optical breakdown KW - Time-resolved measurements KW - Semiconductor KW - Indium phosphide PY - 2010 SN - 1454-4164 VL - 12 IS - 3 SP - 421 EP - 426 PB - INOE & INFM CY - Bucharest AN - OPUS4-21082 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Krüger, Oliver A1 - Adam, Christian A1 - Hobohm, J. A1 - Basu, S. A1 - Kuchta, K. A1 - van Wasen, Sebastian T1 - Recycling oriented comparison of mercury distribution in new and spent fluorescent lamps and their potential risk N2 - This study compares the mercury distribution in the vapor phase, the phosphor powder and the glass matrix of new and spent fluorescent lamps. The spent fluorescent lamps were obtained at the collection yards of a public waste management company in Hamburg, Germany. An innovative systematic sampling method is utilized to collect six spent and eight corresponding new, off-the-shelf fluorescent lamp samples. The efficiency of several acid digestion methods for the determination of the elemental composition was studied and elemental mass fractions of K, Na, Y, Ca, Ba, Eu, Al, Pb, Mg, Hg, and P were measured. The study also finds aqua regia to be the best reagent for acid digestion. However, no significant difference in mercury distribution was found in the different phases of the new and spent fluorescent lamps. KW - Mercury KW - Rare earth elements KW - Hg distribution KW - Fluorescence lamps PY - 2017 DO - https://doi.org/10.1016/j.chemosphere.2016.11.104 SN - 0045-6535 SN - 1879-1298 VL - 169 SP - 618 EP - 626 PB - Elsevier AN - OPUS4-38481 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Beckmann, S. A1 - Krüger, M. A1 - Engelen, B. A1 - Gorbushina, Anna A1 - Cypionka, H. T1 - Role of bacteria, archaea and fungi involved in methane realease in abandoned coal mines N2 - Worldwide, abandoned coal mines release substantial amounts of methane, which is largely of biogenic origin. The aim of this study was to understand the microbial processes involved in mine-gas formation. Therefore, coal and timber samples and anaerobic enrichments from two abandoned coal mines in Germany were subjected to DGGE analyses and quantitative PCR. The primers used were specific for Bacteria, Archaea, Fungi, and the key functional genes for sulfate reduction (dsrA) and methanogenesis (mcrA). A broad spectrum of facultative anaerobic bacteria and acetogens belonging to all five groups (α-ε) of the Proteobacteria, as well as the Bacteroidetes, Tenericutes, Actinobacteria, Chlorobi and Chloroflexi were detected. Archaea were represented by acetoclastic Methanosarcinales and Crenarchaeota with an unknown metabolism. Fungi formed thick biofilms particularly on timber, and were identified as typical wood degraders belonging to the Ascomycetes and Basidiomycetes. The community analysis as well as the environmental conditions and the metabolites detected in a previous study are consistent with the following scenario of methane release: Weathering of coal and timber is initiated by wood-degrading Fungi and Bacteria under a suboxic atmosphere. In the lower, oxygen-depleted layers Fungi and Bacteria perform incomplete oxidation and release reduced substrates which can be channeled into methanogenesis. Acetate appeared to be the main precursor of the biogenic methane in the investigated coal mines. KW - Mine gas KW - Community analysis or microbial diversity KW - Quantitative PCR KW - DGGE KW - Acetoclastic methanogenesis KW - Fermentative bacteria KW - Methanosarcinales PY - 2011 DO - https://doi.org/10.1080/01490451.2010.503258 SN - 0149-0451 VL - 28 IS - 4 SP - 347 EP - 358 PB - Crane, Russak & Co. CY - New York, NY, USA AN - OPUS4-23841 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Peruzzi, N. A1 - Galli, S. A1 - Helmholz, H. A1 - Kardjilov, N. A1 - Krüger, D. A1 - Markötter, Henning A1 - Moosmann, J. A1 - Orlov, D. A1 - Prgomet, Z. A1 - Willumeit-Römer, R. A1 - Wennerberg, A. A1 - Bech, M. T1 - Multimodal ex vivo methods reveal that Gd-rich corrosion byproducts remain at the implant site of biodegradable Mg-Gd screws N2 - Extensive research is being conducted on magnesium (Mg) alloys for bone implant manufacturing, due to their biocompatibility, biodegradability and mechanical properties. Gadolinium (Gd) is among the most promising alloying elements for property control in Mg alloy implants; however, its toxicity is contro- versial. Investigating Gd behavior during implant corrosion is thus of utmost importance. In this study, we analyzed the degradation byproducts at the implant site of biodegradable Mg-5Gd and Mg-10Gd implants after 12 weeks healing time, using a combination of different imaging techniques: histology, energy-dispersive x-ray spectroscopy (EDX), x-ray microcomputed tomography (μCT) and neutron μCT. The main finding has been that, at the healing time in exam, the corrosion appears to have involved only the Mg component, which has been substituted by calcium and phosphorus, while the Gd remains localized at the implant site. This was observed in 2D by means of EDX maps and extended to 3D with a novel application of neutron tomography. X-ray fluorescence analysis of the main excretory organs also did not reveal any measurable accumulation of Gd, further reinforcing the conclusion that very limited or no removal at all of Gd-alloy happened during degradation. KW - Magnesium-gadolinium alloy KW - Biodegradable implant KW - Multimodal analysis KW - Energy-dispersive x-ray spectroscopy KW - Micro-computed tomography PY - 2021 UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-535910 DO - https://doi.org/10.1016/j.actbio.2021.09.047 SN - 1742-7061 SP - 1 EP - 10 PB - Elsevier Ltd. AN - OPUS4-53591 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -