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Conference Paper: Acid treatment biasing to C/N, δ13C and δ15N of organic matter: A Molecular insight

TitleAcid treatment biasing to C/N, δ13C and δ15N of organic matter: A Molecular insight
Authors
KeywordsAcid treatment
C/N
δ13C
δ15N
Measurement uncertainty
Palaeoclimate
Issue Date2012
PublisherDurham University.
Citation
The 1st DIPPI-C Workshop, Durham, UK., 8-10 May 2012. In Abstract Book, 2012, p. 13 How to Cite?
AbstractIt is known that acid treatment methods employed to remove inorganic carbon (IC) from sample material prior to analysis for C/N, δ13C and δ15N cause non-linear, unpredictable biasing to the organic matter (OM) fraction. Consequently, measured C/N, δ13C and δ15N have an uncertainty much greater than instrument precision: uncertainties for C/N are reported in the range of 1 – 100, for δ13C in the range of 0.2 – 6.8 ‰ and for δ15N in the range of 0.2 – 1.5 ‰, in both modern and palaeo environmental materials. Brodie et al (2011) extended this investigation to a down-core lake sedimentary archive (Lake Tianyang, South China) and noted the potential for uncertainties to preclude “common” interpretations of the data (e.g., C/N values a s a n OM p rovenance tool; δ 13C as a proxy for changes in C3 and C4 vegetation). It is evident that the size of uncertainty between sample horizons varies considerably implying a differential relative reaction to acid treatment down-core (i.e., as the type, relative amount and physical state of organic and inorganic components change). We are now investigating this biasing at the molecular level by employing 13C-NMR and GCIRMS techniques on a suite of modern and palaeo environmental materials and on a lake sedimentary archive. This will provide an important insight into the effect of acid treatment on organic compounds (i.e. removal from the sample, breakdown of compounds and partial removal) and associated isotopic fractionation. From an improved understanding of the type of compounds most susceptible to alteration/removal during the acid treatment processes it will be possible to consider refinements to the acid pre-treatment process and provide information on the relative down-core changes in those compounds susceptible to change (which we may be able to glean environmental information from).
Description(DIPPI-C) - Development of Isotopic Proxies for Palaeoenvironmental Interpretation: a Carbon Perspective
Persistent Identifierhttp://hdl.handle.net/10722/149316

 

DC FieldValueLanguage
dc.contributor.authorBrodie, CRen_US
dc.contributor.authorLeng, MJen_US
dc.contributor.authorCasford, JSLen_US
dc.contributor.authorHeaton, THEen_US
dc.contributor.authorKendrick, CPen_US
dc.contributor.authorLloyd, JMen_US
dc.contributor.authorZong, Yen_US
dc.contributor.authorBird, MIen_US
dc.date.accessioned2012-06-22T06:38:27Z-
dc.date.available2012-06-22T06:38:27Z-
dc.date.issued2012en_US
dc.identifier.citationThe 1st DIPPI-C Workshop, Durham, UK., 8-10 May 2012. In Abstract Book, 2012, p. 13en_US
dc.identifier.urihttp://hdl.handle.net/10722/149316-
dc.description(DIPPI-C) - Development of Isotopic Proxies for Palaeoenvironmental Interpretation: a Carbon Perspective-
dc.description.abstractIt is known that acid treatment methods employed to remove inorganic carbon (IC) from sample material prior to analysis for C/N, δ13C and δ15N cause non-linear, unpredictable biasing to the organic matter (OM) fraction. Consequently, measured C/N, δ13C and δ15N have an uncertainty much greater than instrument precision: uncertainties for C/N are reported in the range of 1 – 100, for δ13C in the range of 0.2 – 6.8 ‰ and for δ15N in the range of 0.2 – 1.5 ‰, in both modern and palaeo environmental materials. Brodie et al (2011) extended this investigation to a down-core lake sedimentary archive (Lake Tianyang, South China) and noted the potential for uncertainties to preclude “common” interpretations of the data (e.g., C/N values a s a n OM p rovenance tool; δ 13C as a proxy for changes in C3 and C4 vegetation). It is evident that the size of uncertainty between sample horizons varies considerably implying a differential relative reaction to acid treatment down-core (i.e., as the type, relative amount and physical state of organic and inorganic components change). We are now investigating this biasing at the molecular level by employing 13C-NMR and GCIRMS techniques on a suite of modern and palaeo environmental materials and on a lake sedimentary archive. This will provide an important insight into the effect of acid treatment on organic compounds (i.e. removal from the sample, breakdown of compounds and partial removal) and associated isotopic fractionation. From an improved understanding of the type of compounds most susceptible to alteration/removal during the acid treatment processes it will be possible to consider refinements to the acid pre-treatment process and provide information on the relative down-core changes in those compounds susceptible to change (which we may be able to glean environmental information from).-
dc.languageengen_US
dc.publisherDurham University.-
dc.relation.ispartof1st DIPPI-C Workshopen_US
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.subjectAcid treatment-
dc.subjectC/N-
dc.subjectδ13C-
dc.subjectδ15N-
dc.subjectMeasurement uncertainty-
dc.subjectPalaeoclimate-
dc.titleAcid treatment biasing to C/N, δ13C and δ15N of organic matter: A Molecular insighten_US
dc.typeConference_Paperen_US
dc.identifier.emailBrodie, CR: brodie@hku.hken_US
dc.identifier.emailZong, Y: yqzong@hku.hken_US
dc.identifier.authorityZong, Y=rp00846en_US
dc.description.naturepostprint-
dc.identifier.hkuros200178en_US
dc.identifier.spage13-
dc.identifier.epage13-
dc.publisher.placeUnited Kingdom-
dc.description.otherThe 1st DIPPI-C Workshop, Durham, UK., 8-10 May 2012. In Abstract Bok of the 1st DIPPI-C Workshop, 2012, p. 13-

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