An ultra-clean technique for accurately analysing Pb isotopes and heavy metals at high spatial resolution in ice cores with sub-pg g(-1) Pb concentrations

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dc.contributor.authorBurn, LJen_AU
dc.contributor.authorRoseman, KJRen_AU
dc.contributor.authorCandelone, JPen_AU
dc.contributor.authorVallelonga, Pen_AU
dc.contributor.authorBurton, GRen_AU
dc.contributor.authorSmith, AMen_AU
dc.contributor.authorMorgan, VIen_AU
dc.contributor.authorBarbante, Cen_AU
dc.contributor.authorHong, Sen_AU
dc.contributor.authorBoutron, CFen_AU
dc.date.accessioned2009-10-09T04:53:10Zen_AU
dc.date.accessioned2010-04-30T05:05:35Zen_AU
dc.date.available2009-10-09T04:53:10Zen_AU
dc.date.available2010-04-30T05:05:35Zen_AU
dc.date.issued2009-02-23en_AU
dc.date.statistics2009-02-23en_AU
dc.description.abstractMeasurements of Pb isotope ratios in ice containing sub-pg g(-1) concentrations are easily compromised by contamination, particularly where limited sample is available. Improved techniques are essential if Antarctic ice cores are to be analysed with sufficient spatial resolution to reveal seasonal variations due to climate. This was achieved here by using stainless steel chisels and saws and strict protocols in an ultra-clean cold room to decontaminate and section ice cores. Artificial ice cores, prepared from high purity water were used to develop and refine the procedures and quantify blanks. Ba and In, two other important elements present at pg g-1 and fg g(-1) concentrations in Polar ice, were also measured. The final blank amounted to 0.2 +/- 0.2 pg of Pb with Pb-206/Pb-207 and Pb-208/Pb-207 ratios of 1.16 +/- 0.12 and 2.35 +/- 0.16, respectively, 1.5 +/- 0.4 pg of Ba and 0.6 +/- 2.0 fg of In, most of which probably originates from abrasion of the steel saws by the ice. The procedure was demonstrated on a Holocene Antarctic ice core section and was shown to contribute blanks of only similar to 5%, similar to 14% and similar to 0.8% to monthly resolved samples with respective Pb, Ba and In concentrations of 0.12 pg g(-1), 0.3 pg g(-1) and 2.3 fg g(-1). Uncertainties in the Pb isotopic ratio measurements were degraded by only similar to 0.2%. © 2009, Elsevier Ltd.en_AU
dc.identifier.citationBurn, L. J., Rosman, K. J. R., Candelone, J. P., Vallelonga, P., Burton, G. R., Smith, A. M., Morgan, V. I., Barbante, C., Hone, S., & Boutron, C. F. (2009). An ultra-clean technique for accurately analysing Pb isotopes and heavy metals at high spatial resolution in ice cores with sub-pg g(-1) Pb concentrations. Analytica Chimica Acta, 634(2), 228-236. doi:10.1016/j.aca.2008.11.067en_AU
dc.identifier.govdoc1361en_AU
dc.identifier.issn0003-2670en_AU
dc.identifier.issue2en_AU
dc.identifier.journaltitleAnalytica Chimica Actaen_AU
dc.identifier.pagination228-236en_AU
dc.identifier.urihttp://dx.doi.org/10.1016/j.aca.2008.11.067en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/1994en_AU
dc.identifier.volume634en_AU
dc.language.isoenen_AU
dc.publisherElsevieren_AU
dc.subjectAntarcticaen_AU
dc.subjectIceen_AU
dc.subjectMass spectroscopyen_AU
dc.subjectLead isotopesen_AU
dc.subjectBariumen_AU
dc.subjectIndiumen_AU
dc.titleAn ultra-clean technique for accurately analysing Pb isotopes and heavy metals at high spatial resolution in ice cores with sub-pg g(-1) Pb concentrationsen_AU
dc.typeJournal Articleen_AU
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