Application of zinc sealed tube graphitization on sub-milligram samples using EnvironMICADAS

Rinyu, László; Orsovszki, Gergely; Futó, István; Veres, Mihály; Molnár, Mihály

doi:10.1016/j.nimb.2015.03.083

Cited by 36 publications

(19 citation statements)

References 19 publications

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“…The tubes were then cooled, cracked and CO 2 was cryogenically transferred into an assembled Pyrex glass tube reactor with the appropriate reagents. A subsequent graphitization step was performed in sealed Pyrex tubes using powdered Zn and Fe (Rinyu et al 2013, 2015; Orsovszki and Rinyu 2015). The resulting graphites were torch-sealed below the top of the inner reactor tube (through the wall of outer tube, without opening) to avoid contamination by atmospheric 14 CO 2 .…”

Section: Methodsmentioning

confidence: 99%

Bomb Peak: Radiocarbon Dating of Skeletal Remains in Routine Forensic Medical Practice

et al. 2018

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When human remains are found, apart from helping explain the cause of death and determining the extent of any injuries, forensic pathologists are usually requested to determine the identity of the deceased and how much time has elapsed since his death. In the Czech Republic, the criminal liability for murder is set to a statute of limitations of 20 years. In our pilot study, tissue samples of human remains from two decedents were radiocarbon (14C) dated to estimate the date of death. In agreement with published literature, we have confirmed relatively short carbon turnover time in hair, nail, and bone fat. Therefore these samples are the most appropriate for determining date of death. Other samples, such as teeth (collagen and carbonate form) and collagen isolated from bone samples, which exhibit relatively long carbon turnover time, can be used to reduce ambiguity of dating results and to indicate some interfering influences. Given the possibility of processing multiple sample types, we also propose brief guidelines for comparing and interpreting the results of individual analyses.

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Section: Methodsmentioning

confidence: 99%

Bomb Peak: Radiocarbon Dating of Skeletal Remains in Routine Forensic Medical Practice

et al. 2018

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“…In Step 1 (400°C combustion) the easy-burning non-charred organic carbon is released from the ice samples, while afterward in Step 2 all the rest of the charred carbon fraction is mobilized, including elemental sources. The developed CO 2 of the two fractions were graphitized by a sealed-tube graphitization method (Rinyu et al 2015); and measured separately by the EnvironMICADAS AMS system in Debrecen, Hungary (Molnár et al 2013b).…”

Section: Methodsmentioning

confidence: 99%

Age Estimates on the Deposition of the Cave Ice Block in the Saarhalle Dachstein-Mammoth Cave (Mammuthöhle, Austria) based on ³H and ¹⁴C

et al. 2018

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Measurements of the radiocarbon and tritium activity in a 5.8 m long ice core from the Saarhalle, Dachstein-Mammoth Cave allowed a substantial revision of previous opinions concerning the age of the ice block, and provide useful experience that may be applied to future 14 C dating of cave ice deposits. The stepped combustion technique results in a remarkably older radiocarbon age for the 800°C than for the 400°C fractions of the carbonaceous matter from ice layer samples. The highest tritium activity (37.2±1.2 TU) can be linked to the period of anthropogenically increased tritium activity of atmospheric precipitation at the mid-1960s, providing a well-dated radiochemical reference horizon. Compared the 3 H-based extrapolated ages of two shallow samples to the expected atmospheric signal an average 14 C reservoir bias of ~1500 BP was obtained for the insoluble organic fraction combusted at 400°C. The conventional 14 C age measured for the 400°C fraction of the deeper samples has been corrected with the average reservoir bias. The median calibrated age of the deepest analyzed sample of the ice profile is ~1830 cal BC and a linear extrapolation to the bottom ice layer gave 2590 cal BC making Saarhalle ice block among the oldest dated cave ice deposits known in the Alpine domain.

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“…Sphagnum cellulose samples were combusted in a sealed tube using MnO 2 as the oxidizing agent at 550°C (Janovics et al 2017). The liberated carbon dioxide was cryogenically cleaned and converted to graphite by Fe/Zn reduction (Orsovszki and Rinyu 2015; Rinyu et al 2015, 2013). The samples were measured on the EnvironMICADAS accelerator mass spectrometry (AMS) at the Isotope Climatology and Environmental Research Centre (ICER, Atomki, Debrecen, Hungary) (Molnár et al 2013a, 2013b).…”

Section: Methodsmentioning

confidence: 99%

High-Resolution Peat Core Chronology Covering the Last 12 KYR Applying an Improved Peat Bog Sampling

et al. 2018

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This work focuses on building a high-resolution age-depth model for quantitative palaeoclimate study from the Mohos peat bog, East Carpathian mountains. The investigated core presents a continuous peat profile for the last 12 kyr. The chronology was based on 36 accelerator mass spectrometry radiocarbon (AMS 14C) analyses of the separated Sphagnum samples from different depths of the profile. Dry Sphagnum samples for AMS dating were prepared using the classic acid-base-acid (ABA) method followed with an oxidative bleaching step to get clean cellulose. Sphagnum cellulose samples were measured by AMS using the EnvironMICADAS at the ICER (Debrecen, Hungary). A high-resolution chronology was obtained with the use of Bayesian age-depth modeling. Peat accumulation rate has been calculated and the sections with variable accumulation rate values were observed along the profile.

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Application of zinc sealed tube graphitization on sub-milligram samples using EnvironMICADAS

Cited by 36 publications

References 19 publications

Bomb Peak: Radiocarbon Dating of Skeletal Remains in Routine Forensic Medical Practice

Bomb Peak: Radiocarbon Dating of Skeletal Remains in Routine Forensic Medical Practice

Age Estimates on the Deposition of the Cave Ice Block in the Saarhalle Dachstein-Mammoth Cave (Mammuthöhle, Austria) based on ³H and ¹⁴C

High-Resolution Peat Core Chronology Covering the Last 12 KYR Applying an Improved Peat Bog Sampling

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Application of zinc sealed tube graphitization on sub-milligram samples using EnvironMICADAS

Cited by 36 publications

References 19 publications

Bomb Peak: Radiocarbon Dating of Skeletal Remains in Routine Forensic Medical Practice

Bomb Peak: Radiocarbon Dating of Skeletal Remains in Routine Forensic Medical Practice

Age Estimates on the Deposition of the Cave Ice Block in the Saarhalle Dachstein-Mammoth Cave (Mammuthöhle, Austria) based on 3H and 14C

High-Resolution Peat Core Chronology Covering the Last 12 KYR Applying an Improved Peat Bog Sampling

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Product

Resources

About

Age Estimates on the Deposition of the Cave Ice Block in the Saarhalle Dachstein-Mammoth Cave (Mammuthöhle, Austria) based on ³H and ¹⁴C