TY - JOUR A1 - Gloede, J. A1 - Ozegowski, S. A1 - Keitel, I. A1 - Buttge, K. A1 - Gruner, M. A1 - Costisella, B. A1 - Pritzkow, Wolfgang A1 - Stephan, H. A1 - Bartoschek, M. T1 - Zweifach und dreifach intramolekular verbrückte p-tert-Butylcalix[8]aren-triphosphate - Synthese, Struktur und Stereochemie [1] N2 - The phosphorylation of p-tert-butylcalix[8]arene (1) with phosphorus pentachloride and hydrolysis gives intramolecular bridging tert-butylcalix[8]arene triphosphates. The reactivity (esterification, dehydratisation, complexation), the structure (nmr and x-ray), and the stereochemical behaviour of the phosphates will be discussed. KW - Calix[8]arenes KW - Phosphates KW - Heterocycles KW - Stereochemistry PY - 2006 DO - https://doi.org/10.1002/zaac.200500203 SN - 0044-2313 SN - 1521-3749 SN - 0372-7874 SN - 0863-1786 SN - 0863-1778 VL - 632 IS - 1 SP - 123 EP - 132 PB - Wiley-VCH CY - Weinheim AN - OPUS4-13201 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Lucassen, F. A1 - Pritzkow, Wolfgang A1 - Rosner, M. A1 - Sepulveda, F. A1 - Vasquez, P. A1 - Wilke, H. A1 - Kasemann, S. A. T1 - The stable isotope composition of nitrogen and carbon and elemental contents in modern and fossil seabird guano from Northern Chile – Marine sources and diagenetic effects N2 - Seabird excrements (guano) have been preserved in the arid climate of Northern Chile since at least the Pliocene. The deposits of marine organic material in coastal areas potentially open a window into the present and past composition of the coastal ocean and its food web. We use the stable isotope composition of nitrogen and carbon as well as element contents to compare the principal prey of the birds, the Peruvian anchovy, with the composition of modern guano. We also investigate the impact of diagenetic changes on the isotopic composition and elemental contents of the pure ornithogenic sediments, starting with modern stratified deposits and extending to fossil guano. Where possible, 14C systematics is used for age information. The nitrogen and carbon isotopic composition of the marine prey (Peruvian anchovy) of the birds is complex as it shows strong systematic variations with latitude. The detailed study of a modern profile that represents a few years of guano deposition up to present reveals systematic changes in nitrogen and carbon isotopic composition towards heavier values that increase with age, i.e. depth. Only the uppermost, youngest layers of modern guano show compositional affinity to the prey of the birds. In the profile, the simultaneous loss of nitrogen and carbon occurs by degassing, and non-volatile elements like phosphorous and calcium are passively enriched in the residual guano. Fossil guano deposits are very low in nitrogen and low in carbon contents, and show very heavy nitrogen isotopic compositions. One result of the study is that the use of guano for tracing nitrogen and carbon isotopic and elemental composition in the marine food web of the birds is restricted to fresh material. Despite systematic changes during diagenesis, there is little promise to retrieve reliable values of marine nitrogen and carbon signatures from older guano. However, the changes in isotopic composition from primary marine nitrogen isotopic signatures towards very heavy values generate a compositionally unique material. These compositions trace the presence of guano in natural ecosystems and its use as fertilizer in present and past agriculture. KW - Isotope ratio KW - VPDB KW - Fishmeal KW - Elemental analyser KW - Vario EL III KW - Casein standard KW - ICP-OES KW - Accelerator mass spectrometry PY - 2017 UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-407911 DO - https://doi.org/10.1371/journal.pone.0179440 SN - 1932-6203 VL - 12 IS - 6 SP - Article e0179440, 1 EP - 25 PB - PLOS CY - San Francisco, California, US AN - OPUS4-40791 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Vogl, Jochen A1 - Pritzkow, Wolfgang A1 - Klingbeil, Patrick T1 - The need for new SI-traceable magnesium isotopic reference materials KW - Isotopic Reference Material KW - Multi-collector ICP-MS KW - Isotopic abundance variations KW - Primary Isotopic Reference Material KW - Magnesium PY - 2004 DO - https://doi.org/10.1007/s00216-004-2859-8 SN - 1618-2642 SN - 1618-2650 VL - 380 SP - 876 EP - 879 PB - Springer CY - Berlin AN - OPUS4-6904 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Vogl, Jochen A1 - Rosner, Martin A1 - Pritzkow, Wolfgang T1 - The need for new isotope reference materials N2 - Isotope reference materials are needed to calibrate and validate analytical procedures used for the determination of isotope amount ratios, procedurally defined isotope ratios or so-called δ values. In contrast to the huge analytical progress in isotope ratio analytics, the production of isotope reference materials has not kept pace with the increasing needs of isotope analysts. Three representative isotope systems are used to explain the technical and non-technical difficulties and drawbacks, on one hand, and to demonstrate what can be achieved at its best, on the other hand. A clear statement is given that new isotope reference materials are needed to obtain traceable and thus comparable data, which is essential for all kinds of isotope research. The range of available isotope reference materials and δ reference materials should be increased and matrix reference materials certified for isotope compositions or δ values, which do not exist yet, should be provided. KW - Isotope reference materials KW - Delta reference materials KW - Synthetic isotope mixtures KW - Mass spectrometry KW - Comparability KW - Traceability KW - Measurement uncertainty PY - 2013 DO - https://doi.org/10.1007/s00216-012-6605-3 SN - 1618-2642 SN - 1618-2650 VL - 405 IS - 9 SP - 2763 EP - 2770 PB - Springer CY - Berlin AN - OPUS4-28169 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Pritzkow, Wolfgang A1 - Wunderli, S. A1 - Vogl, Jochen A1 - Fortunato, G. T1 - The isotope abundances and the atomic weight of cadmium by a metrological approach N2 - Gravimetric synthetic mixtures of seven enriched, purified cadmium isotope materials were used to determine the correction factors for mass fractionation (MC-TIMS) and mass discrimination (MC-ICP-MS). The isotope abundance ratios determined for various natural cadmium materials represents the isotope composition for natural cadmium materials. Correction of the isotope abundance ratios observed yielded isotope abundances of 106Cd 0.012450(8), 108Cd 0.008884(4), 110Cd 0.124846(16), 111Cd 0.127955(14), 112Cd 0.241110(38), 113Cd 0.122254(22), 114Cd 0.287439(60) and 116Cd 0.075183(32). The newly determined atomic weight of natural cadmium based on SI-traceable evaluation of the isotope abundance ratios is 112.41384(18). The cadmium material designated in the paper as Cd-2211 can be used as an isotope reference material with a δ(114Cd/110Cd)-value of 0‰. The results obtained show that the uncertainties for the isotope abundances and the atomic weight given as IUPAC values for cadmium are overestimated. KW - Atomic weight KW - Isotope abundance KW - Isotopic composition KW - Cadmium PY - 2007 SN - 0168-1176 SN - 0020-7381 SN - 1387-3806 SN - 1873-2798 VL - 261 IS - 1 SP - 74 EP - 85 PB - Elsevier CY - Amsterdam AN - OPUS4-14543 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Pritzkow, Wolfgang A1 - Rosner, Martin A1 - Vogl, Jochen A1 - Herwig, Nadine A1 - Rienitz, O. A1 - Jährling, R. T1 - Sr-Isotopenreferenzmaterial - Ist eine neue Zertifizierung erforderlich? T2 - 21. ICP-MS-Anwendertreffen + 8. Symposium der Massenspektrometische Verfahren der Elementaranalyse CY - Dresden, Germany DA - 2008-09-17 PY - 2008 AN - OPUS4-18056 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Riebe, Gundel A1 - Pritzkow, Wolfgang A1 - Vogl, Jochen T1 - Schwermetallbestimmung im Boden KW - Königswasserextraktion KW - Bodenanalyse KW - Schwermetallbestimmung KW - Unsicherheitsvergleiche PY - 2006 SN - 0016-3538 IS - 8 SP - 688 EP - 690 PB - GIT-Verlag CY - Darmstadt AN - OPUS4-13725 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CHAP A1 - Vogl, Jochen A1 - Pritzkow, Wolfgang ED - Vanhaecke, F. ED - Degryse, P. T1 - Reference materials in isotopic analysis KW - ICPMS KW - IRM KW - Reference materials KW - Delta reference materials PY - 2012 SN - 978-3-527-32896-3 IS - Chapter 6 SP - 139 EP - 163 PB - Wiley-VCH Verlag GmbH & Co. KGaA CY - Weinheim AN - OPUS4-26102 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Ecker, Klaus A1 - Wätjen, U. A1 - Berger, Achim A1 - Persson, L. A1 - Pritzkow, Wolfgang A1 - Radtke, Martin A1 - Riesemeier, Heinrich T1 - RBS, SY-XRF, INAA and ICP-IDMS of antimony implanted in silicon - A multi-method approach to characterize and certify a reference material N2 - A layer of Sb atoms, implanted with an energy of 400 keV and a nominal dose of 5×1016 atoms/cm2 into a high purity silicon wafer, was certified for its areal density (atoms/cm2) using Rutherford backscattering spectrometry (RBS), instrumental neutron activation analysis (INAA) and inductively coupled plasma isotope dilution mass spectrometry (ICP-IDMS) and for its isotope ratio using INAA and ICP-IDMS. Excellent agreement between the results of the different independent methods was found. In the present work, the measurements of the homogeneity of the areal density of Sb, previously determined with RBS in spots having 1 mm diameter, are improved with synchrotron X-ray fluorescence analysis: Higher precision in even smaller sample spots allows to estimate a reduced inhomogeneity of the whole batch of samples of the order of only 0.4%. Thus the uncertainty of the certified value can further be reduced. Down to fractions of a chip with 0.3×0.4 mm2 area, the areal density is now certified as (4.81±0.06)×1016 Sb atoms/cm2, where the expanded uncertainty 0.06 (coverage factor k=2) corresponds to only 1.2%. The relative merits of the different analytical methods are discussed. KW - Certified reference material KW - RBS KW - INAA KW - ICP-IDMS KW - XRF KW - SY-XRF PY - 2002 DO - https://doi.org/10.1016/S0168-583X(01)01038-2 SN - 0168-583X SN - 1872-9584 VL - 188 IS - 1-4 SP - 120 EP - 125 PB - Elsevier CY - Amsterdam AN - OPUS4-13870 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Linsinger, T. A1 - Andrzejuk, W. A1 - Bau, A. A1 - Charoud-Got, J. A1 - De VOs, P. A1 - Emteborg, H. A1 - Hearn, R. A1 - Lamberty, A. A1 - Oostra, A. A1 - Pritzkow, Wolfgang A1 - Quétel, C. A1 - Roebben, G. A1 - Tresl, I. A1 - Vogl, Jochen A1 - Wood, S. T1 - Production of three certified reference materials for the sulfur content in gasoline (petrol) N2 - Directive 2003/17/EC of the European Parliament and the European Council stipulates that petrol (gasoline) with a total sulfur content below 10 mg kg-1 must be available in all European Union member states by 2009. Three certified reference materials were produced in support of this directive in a joint effort of the members of the European Reference Materials Initiative (ERM). Two of the materials were made from commercial petrol, while the third one was prepared from a blend of commercial petrols. Relative between-ampule heterogeneity of the materials was quantified and found to be below 2.5%. Potential degradation during storage and dispatch was quantified, and shelf lives based on these values were set. The three materials were characterized by three institutes using different variants of isotope-dilution mass spectrometry. The results from the three institutes were combined, and the final uncertainties of the respective sulfur mass fractions were estimated including contributions from heterogeneity, stability, and characterization. The following mass fractions were derived: ERM-EF211, 48.8 ± 1.7 mg kg-1; ERM-EF212, 20.2 ± 1.1 mg kg-1; and ERM-EF213, 9.1 ± 0.8 mg kg-1. KW - CRM KW - IDMS KW - ERM PY - 2007 DO - https://doi.org/10.1021/ef070155t SN - 0887-0624 SN - 1520-5029 VL - 21 IS - 4 SP - 2240 EP - 2244 PB - ACS Publ. CY - Washington, DC AN - OPUS4-16371 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -