API src

Found 115 results.

Related terms

Moosmonitoring 1995/96, Untersuchungen der Schwermetallgehalte in Moosen, Cer in Moosen, Einzelelementkarten

In der Bundesrepublik Deutschland wurden von 1990 bis 2005 in fünfjährigem Abstand sowie in den Jahren 2015/16 und 2020/21 Untersuchungen zur Bestimmung der Inhaltsstoffe von Moosen durchgeführt. Schwerpunkt war die Analyse von Schwermetallen, ab 2005/06 auch von Sticksoff. Seit 2015/16 wurde das Stoffspektrum auf persistente organische Stoffe (POP) und Mikroplastik ausgeweitet. Dieses „Moosmonitoring“ ist der deutsche Beitrag zum europäischen Moosmonitoringprogramm, welches durch das „Internationale Kooperativprogramm zur Wirkung von Luftverunreinigungen auf die natürliche Vegetation und auf landwirtschaftliche Kulturpflanzen“ („International Cooperative Programme on Effects of Air Pollution on Natural Vegetation and Crops“, kurz: ICP Vegetation) der Genfer Luftreinhaltekonvention (Convention on Long-range Transboundary Air Pollution, CLRTAP) koordiniert wird. Mit der Durchführung der einzelnen Probenahmekampagnen sowie der Auswertung der Untersuchungsergebnisse wurden durch das Umweltbundesamt (UBA) wechselnde Institutionen beauftragt, so die Bundesanstalt für Geowissenschaften und Rohstoffe (BGR) mit dem Moosmonitoring 1995/96. Die Ergebnisse der nachfolgenden Monitoringjahre hat das Umweltbundesamt veröffentlicht. Sie sind abrufbar unter https://www.umweltbundesamt.de/daten/luft/bioindikation-von-luftverunreinigungen. Das Moos-Monitoring 1995/96 ist mit 1026 Standorten neben dem Moos-Monitoring 2000 das mit der größten Probenahmedichte und mit 40 analysierten Elementen das mit dem größten Untersuchungsspektrum. Obwohl die in den Jahren 1998 und 1999 fertiggestellten Forschungsberichte (Siewers & Herpin, 1998; Siewers, Herpin & Straßburg, 1999) eine Auswertung (Kurzbeschreibung, statistische Maßzahlen, Verteilungskarten) aller 40 analysierten Elemente enthalten, wurden bislang nur die Daten von 12 der analysierten Elemente veröffentlicht. Darüber hinaus wurden im Jahr 2007 die im Ergebnis der Analytik vorliegenden Rohdaten aus den Laboratorien einer Neubewertung unterzogen. Daraus resultiert eine Reihe von Fehlerkorrekturen, das auswertbare Elementspektrum konnte auf 42 Elemente erweitert werden. Auch die Ergebnisse dieser Neubewertung sind bislang unveröffentlicht. Die ergänzende Bearbeitung der Daten mit modernen Verfahren bringt eine zusätzliche Aufwertung dieser. Die Downloads zeigen die Verteilung der Cergehalte in Moosen in vier verschiedenen farbigen Punkt- und Isoflächenkarten. Die Legenden der Karten sind wahlweise in der Maßeinheit µg/g oder in einer an den Gehaltsbereich des dargestellten Elements angepassten Maßeinheit abrufbar.

Trace element contents for the <2 μm, 2-20 μm and bulk fractions from LGM European loess sequences

Trace element contents in microg/g measured on the <2 microns, 2-20 microns size fractions and bulk samples from LGM European loess sequences. Samples were crushed in an agate mortar and trace element concentrations were measured following Chauvel et al. (2011). Reproducibility for trace element analyses is better than 5% based on repeat measurements, and the accuracy is also better than 5%, based on the analyses of international rock standards (JSD-1, JSD-3 and LKSD-1.

Metal distribution for sediment samples of the cruise AT010

Offshore wind energy is a steadily growing sector contributing to the worldwide energy production. The impact of these offshore constructions on the marine environment, however, remains unclear in many aspects. In fact, little is known about potential emissions from corrosion protection systems such as organic coatings or galvanic anodes composed of Al and Zn alloys, used to protect offshore structures. In order to assess potential chemical emissions from offshore wind farms and their impact on the marine environment water and sediment samples were taken in and around offshore wind farms of the German Bight between 04.04.2022 and 14.04.2022 within the context of the Hereon-BSH project OffChEm II. The surface sediment samples were taken by a box grab, homogenized, freeze-dried and wet-sieved to gain the <20 µm grain size fraction. The <20 µm grain size fraction was acid digested and measured by ICP-MS/MS for their (trace) metal mass fractions.

Dissolved and particulate trace metal and rare earth element (REE) concentrations during a mesocosm based phytoplankton bloom simulating intertidal coastal conditions

We analyzed concentrations of dissolved and particulate trace metals, including iron (Fe), manganese (Mn), vanadium (V), molybdenum (Mo), thallium (Tl), and rare earth elements (REE), during a mesocosm-based phytoplankton summer bloom mimicking the intertidal zone of the southern North Sea (Jade Bay). The studies aimed to identify key drivers controlling their biogeochemical cycling in dynamic, high-productivity coastal environments. Our results highlight the tidally influenced coastal zone as a critical interface that alters the behavior of supposedly conservative elements such as Mo and Tl (Mori et al., 2021) as well as natural and anthropogenic REE (incl., lanthanum, samarium, and gadolinium) (Mori et al., under review). Trace metal concentrations and shale-normalized REE patterns, determined by quadrupole inductively coupled plasma–mass spectrometry (ICP-MS) and inductively coupled plasma–optical emission spectrometry (ICP-OES), were combined with biogeochemical bulk parameters and pigment-based assessments of phytoplankton growth and community composition (Mustaffa et al., 2020). Trace metal and REE cycling were evaluated in relation to phytoplankton dynamics, particulate organic matter composition (C, N, P), dissolved organic carbon, total dissolved nitrogen, and macronutrient concentrations (nitrate, ammonium, silicate, and inorganic phosphate). The dataset was obtained during a Planktotron-based mesocosm experiment conducted within the framework of the Coastal Ocean Darkening project (Mustaffa et al., 2020).

Elementkarte der Digitalen Lithogeochemischen Karte von Bayern 1:25.000 (dLGK25) - Cer (P50)

Die Elementkarte stellt die räumliche Verteilung der klassifizierten Gehalte des 50. Perzentils von Cer (in mg/kg) innerhalb der 184 geochemischen Gesteinseinheiten in Bayern dar. In die Auswertung gehen dabei nur die Daten der ersten (von maximal drei) Lithologien einer geochemischen Gesteinseinheit ein. Für Informationen im Hinblick auf die Auswertung der Daten sowie auf die kartenmäßige Darstellung wird auf die Metadaten der digitalen Lithogeochemischen Karte 1:25 000 von Bayern (dLGK25) verwiesen.

Elementkarte der Digitalen Lithogeochemischen Karte von Bayern 1:25.000 (dLGK25) - Cer (P90)

Die Elementkarte stellt die räumliche Verteilung der klassifizierten Gehalte des 90. Perzentils von Cer (in mg/kg) innerhalb der 184 geochemischen Gesteinseinheiten in Bayern dar. In die Auswertung gehen dabei nur die Daten der ersten (von maximal drei) Lithologien einer geochemischen Gesteinseinheit ein. Für Informationen im Hinblick auf die Auswertung der Daten sowie auf die kartenmäßige Darstellung wird auf die Metadaten der digitalen Lithogeochemischen Karte 1:25 000 von Bayern (dLGK25) verwiesen.

Ahr river overbank sediments: XRF elemental composition data set (Mayschoß-Transect, core Ahr2022-1_1, Ahr2022-1_2, Ahr2022-2_1, Ahr2022-2_2)

The elemental composition of samples from four sediment cores from the Mayschoß floodplain (Ahr river) was determined by X-ray fluorescence spectrometry (XRF). In the first step of preparation, large organic matter and pebbles were removed from freeze-dried samples (8 g) by sieving (2 mm). Subsequently, the samples were powdered and homogenised with vibratory Retsch mill MM 200. The uniform pills for the analysis were pressed with a carbon-based binding agent by Vaneox press at 20 t for 2 min. The elemental analysis of 50 elements was conducted in a He atmosphere using a Spectro Xepos energy dispersive XRF spectrometer. The surface elevation was extracted from Brell et al. (2023).

Whole-rock chemical analyses from the Heldburg dyke swarm

In the project "Geochemistry and geochronology of the Heldburg dyke swarm, Central European Volcanic Province" we conducted geochemical and geochronological investigations on mafic dykes and former magma chambers of the Heldburg dyke swarm. The latter is part of the Central European Volcanic Province and positioned in the South of Thuringia and the North of Bavaria (Germany). It consists of several hundred mafic NNE-SSW striking dykes with an usual thickness of < 1m and few former magma chambers. All of these have an atypical position within the Central European Volcanic Province located away from Hercynian massifs and major rift axes and were hitherto poorly investigated. In general, 10 different locations of the Heldburg dyke swarm were sampled for whole-rock analyses and 4 different locations were chosen for determining their apatite and zircon ages. The fieldwork was conducted between March 2022 and December 2023. The analytical work was done between June 2022 and April 2024 at the Department of Geodynamics and Geomaterials Research, University of Würzburg (samples preparation, X-ray fluorescence), at the GeoZentrum Nordbayern, University of Erlangen (trace element contents, LA-ICP-MS) and at FIERCE (Frankfurt Isotope & Element Research Center), Goethe University Frankfurt (apatite and zircon ages, LA-ICP-MS). Here, we present the full dataset of 55 whole-rock chemical analyses (X-ray fluorescence, LA-ICP-MS) from ten locations of the Heldburg dyke swarm.

Chemical ICP-AES data of archeological pottery, Wanna, Germany

This is the measurement data from chemical analysis of archaeological Neolithic pottery using Inductively Coupled Plasma- Atomic Emission Spectrometry (ICP-AES). The pottery came from the sites Wanna 1588, 1591, 1592 and 1594 (district of Cuxhaven, Lower Saxony, Germany) and belongs to the cultural group of the Funnel Beaker culture. The measurements are part of the research projects "Preserved in the bog - relics of prehistoric settlement landscapes in the Elbe-Weser triangle" funded by Niedersachsen Vorab and "Pottery traditions as a mirror of social structures of the 5th and 4th millennium BC in northern Central Europe" funded by the German Research Foundation (DFG project number 438036891). The measurements were carried out by OMAC Laboratories Ltd. in Loughrea, Galway, Ireland. A minimum of 0.5 g of sample material was taken from each sherd. The sample material was grinded to a fine powder and solved in a 4-acid solution. These solutions were injected into an excited argon plasma.

Dissolved rare earth elements, shale-normalized patterns, biogeochemical parameters, and indices from molecular analysis of dissolved organic matter across the land-ocean continuum in the German Bight

We analyzed concentrations of dissolved rare earth elements (REE) across the land-ocean continuum in the German Bight (southern North Sea) to identify key drivers for REE cycling in dynamic coastal environments. We identified the coastal transition zone as a critical interface for altering predominantly riverine-derived natural and anthropogenic REEs. We combined shale-normalized REE patterns, measured by quadrupole inductively coupled plasma-mass spectrometry (Q-ICP-MS), with biogeochemical bulk parameters and molecular analysis of dissolved organic matter (DOM) determined by ultrahigh-resolution mass spectrometry (FT-ICR-MS). Samples were acquired during RV Heincke cruise HE527. The dataset includes spatially resolved biogeochemical data (concentrations of chlorophyll-a, dissolved nitrogen, dissolved organic carbon, suspended particulate matter, dissolved iron, dissolved manganese and dissolved REE) in surface waters obtained along the major estuarine transects (Ems, Weser, and Elbe), coast-orthogonal transects and an offshore North Sea transect, with additional deep-water samples. Temporally resolved data were collected near the barrier islands Langeoog and Spiekeroog including the Otzumer Balje inlet. The dataset also contains molecular indices based on DOM composition (see Speidel et al., 2024) REE subgroups, ratios and concentrations of anthropogenic Samarium and Gadolinium (for details see Mori et al., 2025).

1 2 3 4 5 … 10 11 12