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Featured researches published by Ute Dorgerloh.


Bioresource Technology | 2013

Hydrothermally carbonized plant materials: Patterns of volatile organic compounds detected by gas chromatography

Roland Becker; Ute Dorgerloh; Mario Helmis; Jan Mumme; Mamadou Diakité; Irene Nehls

The nature and concentrations of volatile organic compounds (VOCs) in chars generated by hydrothermal carbonization (HTC) is of concern considering their application as soil amendment. Therefore, the presence of VOCs in solid HTC products obtained from wheat straw, biogas digestate and four woody materials was investigated using headspace gas chromatography. A variety of potentially harmful benzenic, phenolic and furanic volatiles along with various aldehydes and ketones were identified in feedstock- and temperature-specific patterns. The total amount of VOCs observed after equilibration between headspace and char samples produced at 270°C ranged between 2000 and 16,000μg/g (0.2-1.6wt.%). Depending on feedstock 50-9000μg/g of benzenes and 300-1800μg/g of phenols were observed. Substances potentially harmful to soil ecology such as benzofurans (200-800μg/g) and p-cymene (up to 6000μg/g in pine wood char) exhibited concentrations that suggest restrained application of fresh hydrochar as soil amendment or for water purification.


Soil and Sediment Contamination: An International Journal | 2018

Volatile Hydrocarbons in Contaminated Soil: Robustness of Fractional Quantification Using Headspace Gas Chromatography-Mass-Spectrometry

Ute Dorgerloh; Roland Becker; Irene Nehls

ABSTRACT Fuel contamination of soils display complex and variable hydrocarbon mixtures with different volatility and toxicity characteristics. A recently suggested headspace procedure for the structure-based quantification of volatile hydrocarbons is evaluated regarding repeatability, reproducibility, and practical robustness. Three aliphatic and three aromatic fractions covering the boiling range between 69 and 216°C were defined as summation parameters by their respective equivalent carbon number ranges. A standard mixture of 35 aliphatic and aromatic hydrocarbons was used for calibration on basis of selected mass fragments specific for the aliphatics and aromatics, respectively. Two standard soils were fortified with the standard mixture or different fuels, respectively, and submitted to the analytical procedure. Limit of detection (LOD) and limit of quantification (LOQ) were for all fractions lower than 0.1 and 0.3 mg/kg, respectively. Analyte recovery was linear up to between 20 and 110 mg hydrocarbons/kg soil depending on the fraction. Hydrocarbon recovery ranged between 80% and 110% depending on the fraction and the repeatability was typically better than 10%. Finally, the impact of extraction solvent variation, column solid-phase polarity, and alternative summation of fractions were investigated. The procedure was applied to liner samples taken from a site contaminated with aviation fuel and its practicability is discussed.


Environmental Pollution | 2018

The effect of polymer aging on the uptake of fuel aromatics and ethers by microplastics

Axel Müller; Roland Becker; Ute Dorgerloh; Franz-Georg Simon; Ulrike Braun

Microplastics are increasingly entering marine, limnic and terrestrial ecosystems worldwide, where they sorb hydrophobic organic contaminants. Here, the sorption behavior of the fuel-related water contaminants benzene, toluene, ethyl benzene and xylene (BTEX) and four tertiary butyl ethers to virgin and via UV radiation aged polypropylene (PP) and polystyrene (PS) pellets was investigated. Changes in material properties due to aging were recorded using appropriate polymer characterization methods, such as differential scanning calorimetry, Fourier transform infrared spectroscopy, gel permeation chromatography, X-ray photoelectron spectroscopy, and microscopy. Pellets were exposed to water containing BTEX and the ethers at 130-190 μg L-1 for up to two weeks. Aqueous sorbate concentrations were determined by headspace gas chromatography. Sorption to the polymers was correlated with the sorbates Kow and was significant for BTEX and marginal for the ethers. Due to substantially lower glass transition temperatures, PP showed higher sorption than PS. Aging had no effect on the sorption behavior of PP. PS sorbed less BTEX after aging due to an oxidized surface layer.


Journal of Environmental Monitoring | 2010

The quantification of hydrogen and methane in contaminated groundwater: validation of robust procedures for sampling and quantification

Ute Dorgerloh; Roland Becker; Hubert Theißen; Irene Nehls

A number of currently recommended sampling techniques for the determination of hydrogen in contaminated groundwater were compared regarding the practical proficiency in field campaigns. Key characteristics of appropriate sampling procedures are reproducibility of results, robustness against varying field conditions such as hydrostatic pressure, aquifer flow, and biological activity. Laboratory set-ups were used to investigate the most promising techniques. Bubble stripping with gas sampling bulbs yielded reproducible recovery of hydrogen and methane which could be verified for groundwater sampled in two field campaigns. The methane content of the groundwater was confirmed by analysis of directly pumped samples thus supporting the trueness of the stripping results. Laboratory set-ups and field campaigns revealed that bubble stripping of hydrogen may be restricted to the type of used pump. Concentrations of dissolved hydrogen after bubble stripping with an electrically driven submersible pump were about one order of magnitude higher than those obtained from diffusion sampling. The gas chromatographic determination for hydrogen and methane requires manual injection of gas samples and detection by a pulsed discharge detector (PDD) and allows limits of quantification of 3 nM dissolved hydrogen and 1 µg L⁻¹ dissolved methane in groundwater. The combined standard uncertainty of the bubble stripping and GC/PDD quantification of hydrogen in field samples was 7% at 7.8 nM and 18% for 78 nM.


Chemical Engineering & Technology | 2014

Hydrothermal Carbonization of Biomass: Major Organic Components of the Aqueous Phase

Roland Becker; Ute Dorgerloh; Ellen Paulke; Jan Mumme; Irene Nehls


Environmental Chemistry Letters | 2008

Determination of volatile organic sulfur compounds in contaminated groundwater

Ute Dorgerloh; Roland Becker; Irene Nehls


Vom Wasser | 2004

Ringversuch zur Bestimmung von leichtflüchtigen halogenierten Kohlenwasserstoffen (LHKW), Vinylchlorid (VC) und Fluorchlorkohlenwasserstoffen (FCKW) in Grundwasser

Ute Dorgerloh; Ulla Ehrhardt; Irene Nehls; Rosemarie Schmieder; Wolfgang Walter; Tin Win; Sabine Hilbert; Michaela Mechler


Archive | 2017

Einfluss der Alterung auf das Sorptionsverhalten von Mikroplastik, eine Laborstudie mit BTEX und Etherverbindungen

Axel Müller; Roland Becker; Ulrike Braun; Ute Dorgerloh


Archive | 2014

Das Problem löst sich von selbst: Stabilisierung von Grundwasserproben zur Bestimmung organischer Inhaltsstoffe

Ute Dorgerloh; Hubert Theißen; Roland Becker; Irene Nehls


Environmental Science: Processes & Impacts | 2013

Stabilisation of groundwater samples for the quantification of organic trace pollutants

Roland Becker; Ute Dorgerloh; Hubert Theißen; Irene Nehls

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Roland Becker

Bundesanstalt für Materialforschung und -prüfung

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Irene Nehls

Bundesanstalt für Materialforschung und -prüfung

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Axel Müller

Bundesanstalt für Materialforschung und -prüfung

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Tin Win

Bundesanstalt für Materialforschung und -prüfung

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Ulrike Braun

Bundesanstalt für Materialforschung und -prüfung

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Franz-Georg Simon

Bundesanstalt für Materialforschung und -prüfung

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Wolfram Bremser

Bundesanstalt für Materialforschung und -prüfung

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