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  1. Article ; Online: Perspective: Hidden biases in isotope delta results and the need for comprehensive reporting.

    Dunn, Philip J H / Skrzypek, Grzegorz

    Rapid communications in mass spectrometry : RCM

    2023  Volume 37, Issue 20, Page(s) e9623

    Abstract: Measurements of stable-isotope composition on an isotope-delta scale can be subject to bias between laboratories or over time within a single laboratory. This bias can arise not just from differences in method protocol but also from changes in reporting ... ...

    Abstract Measurements of stable-isotope composition on an isotope-delta scale can be subject to bias between laboratories or over time within a single laboratory. This bias can arise not just from differences in method protocol but also from changes in reporting guidelines, or even to the isotope-delta scales themselves. Without a clear description of method protocols, including all sample preparation steps, instrumental parameters and settings, data processing including calibration of results and estimation of measurement uncertainty, the traceability and comparability of isotope-delta values cannot be assured as bias(es) may remain hidden. To address this need, there are now clear guidelines published by IUPAC for reporting isotope-delta values for the "light" elements hydrogen, carbon, nitrogen, oxygen and sulfur.
    Language English
    Publishing date 2023-09-14
    Publishing country England
    Document type Journal Article ; Review
    ZDB-ID 58731-x
    ISSN 1097-0231 ; 0951-4198
    ISSN (online) 1097-0231
    ISSN 0951-4198
    DOI 10.1002/rcm.9623
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Zs.A 3461: Show issues Location:
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  2. Article ; Online: Solution to isotope delta challenge.

    Dunn, Philip J H / Meija, Juris

    Analytical and bioanalytical chemistry

    2022  Volume 414, Issue 9, Page(s) 2793

    MeSH term(s) Carbon Isotopes/analysis ; Environmental Monitoring ; Isotopes
    Chemical Substances Carbon Isotopes ; Isotopes
    Language English
    Publishing date 2022-03-21
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 201093-8
    ISSN 1618-2650 ; 0016-1152 ; 0372-7920
    ISSN (online) 1618-2650
    ISSN 0016-1152 ; 0372-7920
    DOI 10.1007/s00216-022-03903-0
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Bonn / Germany

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  3. Article ; Online: Isotope delta challenge.

    Dunn, Philip J H / Meija, Juris

    Analytical and bioanalytical chemistry

    2021  Volume 413, Issue 24, Page(s) 5923–5924

    Language English
    Publishing date 2021-09-15
    Publishing country Germany
    Document type News
    ZDB-ID 201093-8
    ISSN 1618-2650 ; 0016-1152 ; 0372-7920
    ISSN (online) 1618-2650
    ISSN 0016-1152 ; 0372-7920
    DOI 10.1007/s00216-021-03607-x
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Bonn / Germany

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  4. Article ; Online: Recalculation of stable isotope expressions for HCNOS: EasyIsoCalculator.

    Skrzypek, Grzegorz / Dunn, Philip J H

    Rapid communications in mass spectrometry : RCM

    2021  Volume 34, Issue 21, Page(s) e8892

    Abstract: Rationale: The stable HCNOS isotope compositions can be reported as (a) the isotope ratio of two stable isotopes (R); (b) the isotope delta value (δ); and (c) the atom fraction of the isotopes (x). Recalculations between these different expressions are ... ...

    Abstract Rationale: The stable HCNOS isotope compositions can be reported as (a) the isotope ratio of two stable isotopes (R); (b) the isotope delta value (δ); and (c) the atom fraction of the isotopes (x). Recalculations between these different expressions are needed frequently and require the use of the absolute isotope ratio for the zero points of the stable isotope delta scales (R
    Methods: We summarised the recalculation procedures between different expressions of the stable isotope compositions and introduced a user-friendly EasyIsoCalculator that allows the recalculation between the main expressions of isotope compositions. We mathematically and empirically evaluated the possible inconsistencies in reporting of the stable isotope data due to the use of different R
    Results: The recalculation between δ-values and other expressions of the stable isotope compositions always involves the use of R
    Conclusions: Differences in the selection of R
    Language English
    Publishing date 2021-01-19
    Publishing country England
    Document type Journal Article
    ZDB-ID 58731-x
    ISSN 1097-0231 ; 0951-4198
    ISSN (online) 1097-0231
    ISSN 0951-4198
    DOI 10.1002/rcm.8892
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  5. Article ; Online: Absolute isotope ratios defining isotope scales used in isotope ratio mass spectrometers and optical isotope instruments.

    Skrzypek, Grzegorz / Dunn, Philip J H

    Rapid communications in mass spectrometry : RCM

    2020  Volume 34, Issue 20, Page(s) e8890

    Abstract: Rationale: The isotope delta is calculated from the isotope ratio of a sample and the absolute isotope ratio of the zero reference point defining each stable isotope international scale (R: Methods: We reviewed R: Results: Different R: ... ...

    Abstract Rationale: The isotope delta is calculated from the isotope ratio of a sample and the absolute isotope ratio of the zero reference point defining each stable isotope international scale (R
    Methods: We reviewed R
    Results: Different R
    Conclusions: The use of different R
    Language English
    Publishing date 2020-08-23
    Publishing country England
    Document type Journal Article
    ZDB-ID 58731-x
    ISSN 1097-0231 ; 0951-4198
    ISSN (online) 1097-0231
    ISSN 0951-4198
    DOI 10.1002/rcm.8890
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

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  6. Article ; Online: Letter to the Editor regarding: A review of recent compound-specific isotope analysis studies applied to food authentication.

    Salouros, Helen / Carter, James F / Dunn, Philip J H / Doyle, Sean P G

    Food chemistry

    2023  Volume 428, Page(s) 136776

    MeSH term(s) Food ; Carbon Isotopes/analysis ; Food Analysis
    Chemical Substances Carbon Isotopes
    Language English
    Publishing date 2023-07-01
    Publishing country England
    Document type Review ; Letter ; Comment
    ZDB-ID 243123-3
    ISSN 1873-7072 ; 0308-8146
    ISSN (online) 1873-7072
    ISSN 0308-8146
    DOI 10.1016/j.foodchem.2023.136776
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Calibration hierarchies for light element isotope delta reference materials.

    Dunn, Philip J H / Malinovsky, Dmitry / Goenaga-Infante, Heidi

    Rapid communications in mass spectrometry : RCM

    2019  Volume 34, Issue 9, Page(s) e8711

    Language English
    Publishing date 2019-12-17
    Publishing country England
    Document type Letter
    ZDB-ID 58731-x
    ISSN 1097-0231 ; 0951-4198
    ISSN (online) 1097-0231
    ISSN 0951-4198
    DOI 10.1002/rcm.8711
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

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  8. Article ; Online: Publication of the second edition of the FIRMS Network's Good Practice Guide for Isotope Ratio Mass Spectrometry.

    Dunn, Philip J H / Carter, James F

    Rapid communications in mass spectrometry : RCM

    2019  Volume 33, Issue 1, Page(s) 149–150

    Language English
    Publishing date 2019-01-31
    Publishing country England
    Document type Letter
    ZDB-ID 58731-x
    ISSN 1097-0231 ; 0951-4198
    ISSN (online) 1097-0231
    ISSN 0951-4198
    DOI 10.1002/rcm.8299
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: Guidance for characterization of in-house reference materials for light element stable isotope analysis.

    Dunn, Philip J H / Malinovsky, Dmitry / Holcombe, Gill / Cowen, Simon / Goenaga-Infante, Heidi

    Rapid communications in mass spectrometry : RCM

    2021  Volume 35, Issue 20, Page(s) e9177

    Abstract: Rationale: Preparation of in-house reference materials (RMs) is an important aspect of light element stable isotope analysis. While some relevant information is available, there is as yet no clear set of guidelines available covering all aspects of in- ... ...

    Abstract Rationale: Preparation of in-house reference materials (RMs) is an important aspect of light element stable isotope analysis. While some relevant information is available, there is as yet no clear set of guidelines available covering all aspects of in-house production and characterization of RMs.
    Methods: To address this need, the experience of production of certified reference materials under accreditation to ISO 17034:2016 and ISO/IEC 17025:2017 has been distilled into guidance for production of in-house RMs that are fit-for-purpose.
    Results: The guidance provided covers five areas: (i) planning; (ii) material considerations including preparation, packaging, and storage; (iii) measurements and assessments; (iv) value and uncertainty assignment; and (v) monitoring and use.
    Conclusions: In-house RMs prepared by following this guidance can be used to provide traceability to measurement results when used for normalization or for quality control and/or assurance purposes.
    Language English
    Publishing date 2021-08-11
    Publishing country England
    Document type Journal Article
    ZDB-ID 58731-x
    ISSN 1097-0231 ; 0951-4198
    ISSN (online) 1097-0231
    ISSN 0951-4198
    DOI 10.1002/rcm.9177
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  10. Article ; Online: Publication of the second edition of the FIRMS good practice guide for isotope ratio mass spectrometry.

    Dunn, Philip J H / Carter, James F

    Isotopes in environmental and health studies

    2018  Volume 54, Issue 6, Page(s) 656–657

    Language English
    Publishing date 2018-10-24
    Publishing country England
    Document type Journal Article
    ZDB-ID 2100190-X
    ISSN 1477-2639 ; 1025-6016
    ISSN (online) 1477-2639
    ISSN 1025-6016
    DOI 10.1080/10256016.2018.1531495
    Database MEDical Literature Analysis and Retrieval System OnLINE

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