TY - JOUR A1 - Ammann, Dominic A1 - Becker, Roland A1 - Kohl, Anka A1 - Hänisch, Jessica A1 - Nehls, Irene T1 - Degradation of the ethyl glucuronide content in hair by hydrogen peroxide and a non-destructive assay for oxidative hair treatment using infra-red spectroscopy N2 - The assessment of quantification results of the alcohol abuse marker ethyl glucuronide (EtG) in hair in comparison to the cut-off values for the drinking behavior may be complicated by cosmetic hair bleaching. Thus, the impact of increasing exposure to hydrogen peroxide on the EtG content of hair was investigated. Simultaneously, the change of absorbance in the range of 1000–1100 cm-1 indicative for the oxidation of cystine was investigated non-destructively by attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR) using pulverized portions of the respective hair samples. Hair samples treated with hydrogen peroxide consistently displayed a significantly increased absorbance at 1040 cm-1 associated with the formation of cysteic acid. The EtG content decreased significantly if the hair was treated with alkaline hydrogen peroxide as during cosmetic bleaching. It could be shown that ATR-FTIR is capable of detecting an exposure to hydrogen peroxide when still no brightening was visible and already before the EtG content deteriorated significantly. Thus, hair samples suspected of having been exposed to oxidative treatment may be checked non-destructively by a readily available technique. This assay is also possible retrospectively after EtG extraction and using archived samples. KW - Hair testing KW - Oxidation KW - Bleaching KW - Cysteic acid KW - HPLC–MS/MS PY - 2014 U6 - https://doi.org/10.1016/j.forsciint.2014.07.029 SN - 0379-0738 SN - 1872-6283 VL - 244 SP - 30 EP - 35 PB - Elsevier CY - Amsterdam [u.a.] AN - OPUS4-31755 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Ammann, Dominic A1 - Becker, Roland A1 - Nehls, Irene T1 - Stability of ethyl glucuronide in hair reference materials after accelerated aging N2 - Two different hair reference materials, one produced from authentic hair displaying an ethyl glucuronide (EtG) content of about 25 pg/mg and one obtained by fortification of blank hair to an EtG level of 85 pg/mg were submitted to accelerated aging between 4 degrees C and 60 degrees C for periods between one and 24 months. Subsequently, the EtG content was determined in the aged samples and untreated reference samples stored at -22 degrees C under repeatability conditions following the so-called isochronous approach. The EtG content remained stable even at 40 degrees C for 24 months and at 60 degrees C over six months. This is in contrast to many organic analytes contained in trace concentrations in diverse matrices. A slight but significant increase of the recovered EtG in case of authentic hair samples having been exposed for 24 months between 4 degrees C and 60 degrees C may be due to a temperature-driven process that allows increased recoveries of the physiologically embedded EtG. KW - Alcohol marker KW - Micropulverization KW - HPLC-MS/MS KW - Fortification KW - Long term stability PY - 2015 U6 - https://doi.org/10.1016/j.forsciint.2015.09.015 SN - 0379-0738 SN - 1872-6283 VL - 257 SP - 337 EP - 340 PB - Elsevier Ireland Ldt. CY - Amsterdam [u.a.] AN - OPUS4-34940 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Bachmann, H. J. A1 - Bucheli, T. D. A1 - Dieguez-Alonso, A. A1 - Fabbri, D. A1 - Knicker, H. A1 - Schmidt, H.-P. A1 - Ulbricht, A. A1 - Becker, Roland A1 - Buscaroli, A. A1 - Buerge, D. A1 - Cross, A. A1 - Dickinson, D. A1 - Enders, A. A1 - Esteves, V.I. A1 - Evangelou, M. W. H. A1 - Fellet, G. A1 - Friedrich, K. A1 - Gasco Guerrero, G. A1 - Glaser, B. A1 - Hanke, U. M. A1 - Hanley, K. A1 - Hilber, I. A1 - Kalderis, D. A1 - Leifeld, J. A1 - Masek, O. A1 - Mumme, J. A1 - Paneque Carmona, M. A1 - Calvelo Pereira, R. A1 - Rees, F. A1 - Rombola, A. G. A1 - de la Rosa, J. M. A1 - Sakrabani, R. A1 - Sohi, S. A1 - Soja, G. A1 - Valagussa, M. A1 - Verheijen, F. A1 - Zehetner, F. T1 - Towards the standardization of biochar analysis: the COST action TD1107 interlaboratory comparison N2 - Biochar produced by pyrolysis of organic residues is increasingly used for soil amendment and many other applications. However, analytical methods for its physical and chemical characterization are yet far from being specifically adapted, optimized, and standardized. Therefore, COST Action TD1107 conducted an interlaboratory comparison in which 22 laboratories from 12 countries analyzed three different types of biochar for 38 physical–chemical parameters (macro- and microelements, heavy metals, polycyclic aromatic hydrocarbons, pH, electrical conductivity, and specific surface area) with their preferential methods. The data were evaluated in detail using professional interlaboratory testing software. Whereas intralaboratory repeatability was generally good or at least acceptable, interlaboratory reproducibility was mostly not (20% < mean reproducibility standard deviation < 460%). This paper contributes to better comparability of biochar data published already and provides recommendations to improve and harmonize specific methods for biochar analysis in the future. KW - Biochar KW - Analysis KW - Standardization KW - Ring test KW - Interlaboratory comparison PY - 2016 U6 - https://doi.org/10.1021/acs.jafc.5b05055 SN - 0021-8561 SN - 1520-5118 VL - 64 IS - 2 SP - 513 EP - 527 PB - American Chemical Society CY - Columbus, Ohio AN - OPUS4-35289 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Becker, Roland T1 - Interlaboratory comparisons - Erstimating degree of equivalence T2 - 3rd Central European Conference on Reference Materials and Measurements (CERMM-3) CY - Rogaška Slatina, Slovenia DA - 2002-05-30 PY - 2002 AN - OPUS4-2946 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Becker, Roland A1 - Buge, Hans-Gerhard A1 - Nehls, Irene T1 - Proficiency testing of field laboratories - Experience from the soil sector T2 - Workshop on Laboratory Proficiency Testing (Umweltbundesamt) CY - Berlin, Germany DA - 2004-10-07 PY - 2004 AN - OPUS4-5465 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Becker, Roland A1 - Lehnik-Habrink, Petra A1 - Wachholz, S. T1 - BAM-Referenzmaterialien für die Analytik von polychlorierten Biphenylen (PCB) in Altölen sowie polyzyklischen aromatischen Kohlenwasserstoffen (PAK) und Mineralölkohlenwasserstoffen (MKW) in Böden T2 - 11th International Colloquium Tribology, Industrial and Automotive Lubrication CY - Esslingen am Neckar, Germany DA - 1998-01-13 PY - 1998 AN - OPUS4-5682 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Becker, Roland T1 - Zinc-dithialkyldithiophosphates in engine oils - Determination of Conent, Composition and Degradation during Operation using Gas and Liquid Chromatography T2 - 11th International Colloquium Tribology, Industrial and Automotive Lubrication CY - Esslingen am Neckar, Germany DA - 1998-01-13 PY - 1998 AN - OPUS4-5683 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Becker, Roland A1 - Luther, W. T1 - Ringversuch: Methodenvergleich zur Bestimmung von PAK im Boden T2 - 2. Anwendertreffen über kritische Fluide; Universität Siegen CY - Siegen, Germany DA - 1997-10-08 PY - 1997 AN - OPUS4-5674 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Becker, Roland T1 - Besonderheiten der PCP-Bestimmung - erste Erfahrungen eines Rundversuches T2 - Workshop: Bestimmung von Holzschutzmitteln in Gebrauchsholz CY - Braunschweig, Germany DA - 2000-03-16 PY - 2000 AN - OPUS4-5749 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Becker, Roland T1 - Interlaboratory comparisons - Estimating degree of equivalence T2 - 3rd Central European Conference for Reference Materials and Measurements CY - Rogaška Slatina, Slovenia DA - 2002-09-23 PY - 2002 AN - OPUS4-5832 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Becker, Roland T1 - Soil proficiency testing at BAM T2 - Seminario Sectorial Ambiente 2002, Centro National de Metrologia (CENAM) CY - Querétaro, Mexico DA - 2002-09-13 PY - 2002 AN - OPUS4-5833 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Becker, Roland A1 - Scharf, Holger T1 - Altlastenringversuche der BAM - eine Bilanz T2 - InCom 1999 CY - Düsseldorf, Germany DA - 1999-03-22 PY - 1999 AN - OPUS4-5808 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Becker, Roland T1 - Charakterisierung und Qualifizierung von Zinkdialkyldithiophosphaten in Motorölen mittels Gaschrotatografie nach Derivatisierung T2 - InCom 1999 CY - Düsseldorf, Germany DA - 1999-03-22 PY - 1999 AN - OPUS4-5810 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Becker, Roland A1 - Scharf, Holger T1 - Altlastenringversuche der BAM - eine Bilanz IUPAC - ISO/REMCO - BAM - EUROLAB-D T2 - Workshop on proper use of environmental matrix reference materials, BAM CY - Berlin, Germany DA - 1999-04-22 PY - 1999 AN - OPUS4-5811 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Becker, Roland A1 - Reich, Peter A1 - Scharf, Holger T1 - BAM-Ringversuche zur Altlastenanalytik T2 - Analytica Conference 1998 CY - Munich, Germany DA - 1998-04-21 PY - 1998 AN - OPUS4-5817 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Becker, Roland T1 - Proficiency testing of laboratories by interlaboratory comparisons T2 - Workshop of proficiency testing of laboratories by interlaboratory comparisons CY - Dar Es Salaam, Tanzania DA - 2005-07-06 PY - 2005 AN - OPUS4-7650 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Becker, Roland A1 - Buge, Hans-Gerhard A1 - Bremser, Wolfram A1 - Nehls, Irene T1 - Mineral oil content in sediments and soils: ERM-CC015a - a certified reference material for quality assurance T2 - BERM 10, Tenth International Symposium on Biological and Environmental Reference Materials CY - Charleston, SC, USA DA - 2006-04-30 PY - 2006 AN - OPUS4-11810 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Becker, Roland A1 - Mönch, Bettina A1 - Ammann, Dominic A1 - Nehls, Irene T1 - Quantification of ethyl glucuronide in hair: The effect of milling and sonication on the extraction efficiency T2 - 18th Meeting of the Society of Hair Testing CY - Geneva, Switzerland DA - 2013-08-28 PY - 2013 AN - OPUS4-28722 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Becker, Roland T1 - External quality control: a way to improve reliability in hair analysis T2 - 18th Meeting of the Society of Hair Testing CY - Geneva, Switzerland DA - 2013-08-28 PY - 2013 AN - OPUS4-28723 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Becker, Roland A1 - Koon, M. A1 - Helmis, Mario A1 - Wirth, B. A1 - Funke, A. A1 - Mumme, J. T1 - Bewertung von HTC-Kohle für ihre Eignung zur Verbesserung von Bodeneigenschaften T2 - First INTERREG NSR Biochar conference - Biokohle - Klimaretter oder Mogelpackung? Biochar - Climate Savior or Bluff Package? 72. Symposium des ANS e. V., FU BErlin CY - Berlin, Germany DA - 2011-10-05 PY - 2011 AN - OPUS4-24456 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -