Linked Life Data

15645508

Source:http://linkedlifedata.com/resource/pubmed/id/15645508

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
3
pubmed:dateCreated
2005-2-3
pubmed:abstractText
Even though the recent development in on-line methods for the stable isotope determination in cellulose has led to a significant increase in sample throughput and decrease in sample preparation expenditure, there still is a large potential for optimizing the analytical procedures by simultaneously measuring the isotope ratios of two or even more elements. Therefore, the main objective of this study was to answer the question whether high-temperature pyrolysis (HTP) is a suitable and reliable technique for the determination of the carbon isotopic composition of cellulose simultaneously during the well-known conventional oxygen isotope analysis. This study shows that HTP of cellulose is a technique that can produce reasonable delta(13)C values, matching the requirements of most research problems related to paleoclimatology. The reproducibility of the delta values for (13)C/(12)C is better than 0.2 per thousand. Some deficiencies of the method are related to the incomplete conversion of the organic carbon in the sample to carbon monoxide. A clear isotope effect seems to be related to the non-statistical conversion of the carbon in the cellulose to CO. The extent of this effect appears to be controlled by the relative proportion of crystallized and amorphous matter in the cellulose structure. Those deficiencies can be eliminated by using an appropriate normalization and by applying the principles of identical treatment for reference materials and samples. In general, a very good agreement is achieved for carbon isotope values determined by HTP and elemental analysis (EA).
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:issn
0951-4198
pubmed:author
pubmed:copyrightInfo
Copyright (c) 2005 John Wiley & Sons, Ltd.
pubmed:issnType
Print
pubmed:volume
19
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
343-8
pubmed:dateRevised
2008-11-21
pubmed:meshHeading
pubmed:year
2005
pubmed:articleTitle
Carbon isotope analyses of cellulose using two different on-line techniques (elemental analysis and high-temperature pyrolysis)--a comparison.
pubmed:affiliation
UFZ-Centre for Environmental Research Leipzig-Halle, Theodor-Lieser-Strasse 4, D-06120 Halle, Germany. kay.knoeller@ufz.de
pubmed:publicationType
Journal Article, Comparative Study, Research Support, Non-U.S. Gov't