Compilation of Minimum and Maximum Isotope Ratios of Selected Elements in Naturally Occurring Terrestrial Materials and Reagents

Compilation of Minimum and Maximum Isotope Ratios of Selected Elements in Naturally Occurring Terrestrial Materials and Reagents PDF

Author: Tyler B. Coplen

Publisher:

Published: 2002

Total Pages: 114

ISBN-13:

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Documented variations in the isotopic compositions of some chemical elements are responsible for expanded uncertainties in the standard atomic weights published by the Commission on Atomic Weights and Isotopic Abundances of the International Union of Pure and Applied Chemistry. This report summarizes reported variations in the isotopic compositions of 20 elements that are due to physical and chemical fractionation processes (not due to radioactive decay) and their effects on the standard atomic weight uncertainties. For 11 of those elements (hydrogen, lithium, boron, carbon, nitrogen, oxygen, silicon, sulfur, chlorine, copper, and selenium), standard atomic weight uncertainties have been assigned values that are substantially larger than analytical uncertainties because of common isotope abundance variations in materials of natural terrestrial origin. For 2 elements (chromium and thallium), recently reported isotope abundance variations potentially are large enough to result in future expansion of their atomic weight uncertainties. For 7 elements (magnesium, calcium, iron, zinc, molybdenum, palladium, and tellurium), documented isotope-abundance variations in materials of natural terrestrial origin are too small to have a significant effect on their standard atomic weight uncertainties.

Handbook of Stable Isotope Analytical Techniques

Handbook of Stable Isotope Analytical Techniques PDF

Author: Pier A. de Groot

Publisher: Elsevier

Published: 2004-10-27

Total Pages: 1258

ISBN-13: 9780080533278

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(Parent with price) Volume I contains subjective reviews, specialized and novel technique descriptions by guest authors. Part 1 includes contributions on purely analytical techniques and Part 2 includes matters such as development of mass spectrometers, stability of ion sources, standards and calibration, correction procedures and experimental methods to obtain isotopic fractionation factors. Volume II will be available in 2005.

15N Tracing of Microbial Assimilation, Partitioning and Transport of Fertilisers in Grassland Soils

15N Tracing of Microbial Assimilation, Partitioning and Transport of Fertilisers in Grassland Soils PDF

Author: Alice Fiona Charteris

Publisher: Springer Nature

Published: 2019-10-28

Total Pages: 261

ISBN-13: 3030310574

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This book presents innovative research on soil nitrogen cycling and nitrate leaching with a view to improving soil management and fertiliser nitrogen use efficiency and reducing nitrogen leaching losses. In this regard, nitrogen-15 (15N)-labelled fertiliser was used as a biochemical and physical stable isotope tracer in laboratory and field experiments. The major outcome of the research was the development, validation and application of a new compound-specific amino acid 15N stable isotope probing method for assessing the assimilation of fertiliser nitrogen by soil microbial biomass. The novelty of the method lies in its tracing of incorporated nitrogen into newly biosynthesised microbial protein in time-course experiments using gas chromatography-combustion-isotope ratio mass spectrometry. The approach provides previously unattainable insights into the microbial processing of different nitrogen fertilisers in different soils. Further, it identifies the mechanistic link between molecular-scale processes and observations of field-scale fertiliser nitrogen immobilisation studies. The method and the results presented here will have far-reaching implications for the development of enhanced recommendations concerning farm-based soil management practices for increasing soil productivity and reducing nitrogen losses, which is essential to minimising environmental impacts.

Non-Traditional Stable Isotopes

Non-Traditional Stable Isotopes PDF

Author: Fang-Zhen Teng

Publisher: Walter de Gruyter GmbH & Co KG

Published: 2017-03-06

Total Pages: 902

ISBN-13: 3110545632

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The development of multi-collector inductively coupled plasma mass spectrometry (MC-ICPMS) makes it possible to precisely measure non-traditional stable isotopes. This volume reviews the current status of non-traditional isotope geochemistry from analytical, theoretical, and experimental approaches to analysis of natural samples. In particular, important applications to cosmochemistry, high-temperature geochemistry, low-temperature geochemistry, and geobiology are discussed. This volume provides the most comprehensive review on non-traditional isotope geochemistry for students and researchers who are interested in both the theory and applications of non-traditional stable isotope geochemistry.

Flavourings

Flavourings PDF

Author: Herta Ziegler

Publisher: John Wiley & Sons

Published: 2007-09-24

Total Pages: 852

ISBN-13: 3527611460

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The demand for flavourings has been constantly increasing over the last years as a result of the dramatic changes caused by a more and more industrialised life-style: The consumer is drawn to interesting, healthy, pleasurable, exciting or completely new taste experiences. This book draws on the expert knowledge of nearly 40 contributors with backgrounds in both industry and academia and provides a comprehensive insight into the production, processing and application of various food flavourings. Methods of quality control and quality management are discussed in detail. The authors also focus on conventional and innovative analytical methods employed in this field and, last but not least, on toxicological, legal, and ethical aspects. Up-to-date references to pertinent literature and an in-depth subject index complete the book.

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