A versatile gas interface for routine radiocarbon analysis with a gas ion source

Wacker, Lukas; Fahrni, Simon; Hajdas, Irka; Molnár, Mihály; Synal, Hans-Arno; Szidat, Sönke; Zhang, Yanlin

doi:10.1016/j.nimb.2012.02.009

Cited by 199 publications

(188 citation statements)

References 46 publications

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“…Secondly, new hyphenated (i.e. coupled) analytical systems shall be developed for on-line separation and 14 C detection of specific fractions or individual compounds (Wacker et al 2013a). This article describes the instrumentation of the new Bern Laboratory for the Analysis of Radiocarbon with AMS (LARA), which became operational in May 2013, and first quality assurance measures.…”

Section: Analysis Of Radiocarbon (mentioning

confidence: 99%

“…Separation and sample combustion instruments were directly coupled with the gas source (Perron et al 2010;Ruff et al 2010) with applications to carbonaceous aerosols in the atmosphere and in glacier ice (Sigl et al 2009;Szidat 2009a,b;Zhang et al 2012). A particular focus was on building and refining of an automated gas interface (Wacker et al 2013a), which enables the transfer of carbon dioxide to the gas ion source from different sources, such as sealed glass ampoules, an acidification device for carbonate samples (Wacker et al 2013b), as well as an elemental analyzer or other combustion instruments (Perron et al 2010). …”

Section: Instrumentationmentioning

confidence: 99%

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14C Analysis and Sample Preparation at the New Bern Laboratory for the Analysis of Radiocarbon with AMS (LARA)

et al. 2014

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ABSTRACT. The University of Bern has set up the new Laboratory for the Analysis of Radiocarbon with AMS (LARA) equipped with an accelerator mass spectrometer (AMS) MICADAS (MIni CArbon Dating System) to continue its long history of 14 C analysis based on conventional counting. The new laboratory is designated to provide routine 14 C dating for archaeology, climate research, and other disciplines at the University of Bern and to develop new analytical systems coupled to the gas ion source for 14 C analysis of specific compounds or compound classes with specific physical properties. Measurements of reference standards and wood samples dated by dendrochronology demonstrate the quality of the 14 C analyses performed at the new laboratory.

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Section: Analysis Of Radiocarbon (mentioning

confidence: 99%

Section: Instrumentationmentioning

confidence: 99%

14C Analysis and Sample Preparation at the New Bern Laboratory for the Analysis of Radiocarbon with AMS (LARA)

et al. 2014

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“…The MICADAS setup allows for direct 14 C measurement, using a gas ion source (Wacker et al, 2013b), of gaseous CO 2 liberated from CaCO 3 samples by acidification with phosphoric acid -i.e. no graphitisation step is necessary.…”

Section: Ams Analysis Was Carried Out At the Laboratory For Ion Beam mentioning

confidence: 99%

“…In this study, we utilise the latest developments in ultra-small (<100 μg CaCO 3 ) sample 14 C dating (Synal et al, 2007;Wacker et al, 2013aWacker et al, , 2013bWacker et al, , 2013c to reduce sample size to a single benthic foraminifer specimen (Cibicidoides wuellerstorfi), thereby allowing us to directly quantify intra-sample age heterogeneity and statistically analyse PDSM in the case of the low SAR (~2 cm/ka) sediment core T86-10P from the Azores region of the North Atlantic (Fig. 1).…”

mentioning

confidence: 99%

Moving beyond the age-depth model paradigm in deep sea palaeoclimate archives: dual radiocarbon and stable isotope analysis on single foraminifera

Lougheed¹,

Metcalfe²,

Ninnemann³

et al. 2017

Preprint

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Abstract. Late-glacial palaeoclimate reconstructions from deep-sea sediment archives provide valuable insight into past rapid changes in ocean chemistry, but only a small proportion of the ocean floor is suitable for such reconstructions using the existing state-of-the-art using the age-depth approach. We employ ultra-small radiocarbon ( 14 C) dating on single microscopic foraminifera to demonstrate that the longstanding age-depth method conceals large age uncertainty caused by postdepositional sediment mixing, meaning that existing studies may underestimate total geochronological error. To overcome 20 these problems, we use dual 14 C and stable isotope (δ 18 O and δ 13 C) analysis on single microscopic foraminifera to produce a palaeoclimate time series independent of the age-depth paradigm. This new and novel method will address large geographical gaps in late-glacial benthic palaeoceanographic reconstructions by opening up vast areas of previously disregarded deep-sea archives, leading to improved understanding of the global interaction between oceans and climate.

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“…Tubes were flame-sealed and combusted at 850°C for 5 hours to convert all OC to CO 2 , was cryogenically purified, manometrically quantified and transferred to glass tubes on a vacuum line. Samples were either submitted to NOSAMS as CO 2 , where they were converted to graphite and analyzed by AMS, or analyzed as CO 2 on the Micadas gas ion source AMS at ETH-Zürich (Christl et al, 2013;Wacker et al, 2013). Analytical precision for POC…”

Section: Dic and Doc Concentrations Optical Propertiesmentioning

confidence: 99%

Spatial and temporal dynamics of biogeochemical processes in the Fraser River, Canada : a coupled organic-inorganic perspective

Voß¹

2014

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The great geologic and climatic diversity of the Fraser River basin in southwestern Canada render it an excellent location for understanding biogeochemical cycling of sediments and terrigenous organic carbon in a relatively pristine, large, temperate watershed. Sediments delivered by all tributaries have the potential to reach the ocean due to a lack of main stem lakes or impoundments, a unique feature for a river of its size. This study documents the concentrations of a suite of dissolved and particulate organic and inorganic constituents, which elucidate spatial and temporal variations in chemical weathering (including carbonate weathering in certain areas) as well as organic carbon mobilization, export, and biogeochemical transformation. Radiogenic strontium isotopes are employed as a tracer of sediment provenance based on the wide variation in bedrock age and lithology in the Fraser basin. The influence of sediments derived from the headwaters is detectable at the river mouth, however more downstream sediment sources predominate, particularly during high discharge conditions. Bulk radiocarbon analyses are used to quantify terrestrial storage timescales of organic carbon and distinguish between petrogenic and biospheric organic carbon, which is critical to assessing the role of rivers in long-term atmospheric CO 2 consumption. The estimated terrestrial residence time of biospheric organic carbon in the Fraser basin is 650 years, which is relatively short compared to other larger rivers (Amazon, Ganges-Brahmaputra) in which this assessment has been performed, and is likely related to the limited floodplain storage capacity and non-steadystate post-glacial erosion state of the Fraser River. A large portion of the dissolved inorganic carbon load of the Fraser River (>80%) is estimated to derive from remineralization of dissolved organic carbon, particularly during the annual spring freshet when organic carbon concentrations increase rapidly. This thesis establishes a baseline for carbon cycling in a largely unperturbed modern mid-latitude river system and establishes a framework for future process studies on the mechanisms of organic carbon turnover and organic matter-mineral associations in river systems.

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A versatile gas interface for routine radiocarbon analysis with a gas ion source

Cited by 199 publications

References 46 publications

14C Analysis and Sample Preparation at the New Bern Laboratory for the Analysis of Radiocarbon with AMS (LARA)

14C Analysis and Sample Preparation at the New Bern Laboratory for the Analysis of Radiocarbon with AMS (LARA)

Moving beyond the age-depth model paradigm in deep sea palaeoclimate archives: dual radiocarbon and stable isotope analysis on single foraminifera

Spatial and temporal dynamics of biogeochemical processes in the Fraser River, Canada : a coupled organic-inorganic perspective

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