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Use of heavy liquid density separation to remove pyrite from sediment samples for radiocarbon dating

Proske, Ulrike; Wood, Rachel; Fallon, Stewart; Stevenson, Janelle

Description

Sample preparation protocols for concentrating organic material from sediments for radiocarbon dating often include a large number of steps and the use of hazardous chemicals. Thus, these protocols are often problematic for pollen-poor sediments as material can get lost or may become degraded. Pyrite in samples for radiocarbon dating hinders an effective graphitisation process and thus needs to be removed during sample preparation. Standard protocols require the use of nitric acid, a strong...[Show more]

dc.contributor.authorProske, Ulrike
dc.contributor.authorWood, Rachel
dc.contributor.authorFallon, Stewart
dc.contributor.authorStevenson, Janelle
dc.date.accessioned2015-12-13T22:32:42Z
dc.identifier.issn1871-1014
dc.identifier.urihttp://hdl.handle.net/1885/75687
dc.description.abstractSample preparation protocols for concentrating organic material from sediments for radiocarbon dating often include a large number of steps and the use of hazardous chemicals. Thus, these protocols are often problematic for pollen-poor sediments as material can get lost or may become degraded. Pyrite in samples for radiocarbon dating hinders an effective graphitisation process and thus needs to be removed during sample preparation. Standard protocols require the use of nitric acid, a strong oxidant that corrodes organic material. Therefore, the use of nitric acid needs to be avoided when preparing pollen-poor but pyrite-rich sediments.We present a method that minimises the sample preparation steps by replacing acid treatment with heavy liquid separation. Using non-toxic LST at a density of 2.0gcm-3 is shown to be effective for separating the organic fraction from sulphides, silicates and carbonates. We applied this method to pyrite-rich and pollen-poor sediments from Western Australia that had previously been problematic to date. The successful AMS radiocarbon dating of all samples pre-treated with LST demonstrates the effectiveness of this method.
dc.publisherElsevier
dc.sourceQuaternary Geochronology
dc.titleUse of heavy liquid density separation to remove pyrite from sediment samples for radiocarbon dating
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume25
dc.date.issued2015
local.identifier.absfor040303 - Geochronology
local.identifier.ariespublicationU3488905xPUB4746
local.type.statusPublished Version
local.contributor.affiliationProske, Ulrike, College of Asia and the Pacific, ANU
local.contributor.affiliationWood, Rachel, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationFallon, Stewart, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationStevenson, Janelle, College of Asia and the Pacific, ANU
local.description.embargo2037-12-31
local.bibliographicCitation.startpage66
local.bibliographicCitation.lastpage71
local.identifier.doi10.1016/j.quageo.2014.10.002
local.identifier.absseo961401 - Coastal and Estuarine Soils
local.identifier.absseo970104 - Expanding Knowledge in the Earth Sciences
dc.date.updated2015-12-11T09:09:23Z
local.identifier.scopusID2-s2.0-84908258023
CollectionsANU Research Publications

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