Sealed Tube Combustion Method with MnO2 for AMS 14C Measurement

Janovics, Róbert; Futó, István; Molnár, Mihály

doi:10.1017/rdc.2018.110

Cited by 34 publications

(19 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A standard BABAB (basic-acid-basic-acidbleaching) cellulose preparation method was used to prepare the samples for the combustion (Nemec et al 2010;Molnár et al 2013a). MnO 2 reagent was used as an oxidizing agent to convert the pure cellulose to CO 2 at 550°C, 12 hr (Janovics et al 2018). The released gas was purified in a vacuum line with dry ice-isopropyl alcohol mixture and liquid nitrogen trap to collect the pure CO 2 gas separately from H 2 O and other contaminants.…”

Section: Methodsmentioning

confidence: 99%

Variation of ¹⁴C in Japanese Tree Rings Related to the Fukushima Nuclear Accident

et al. 2019

Self Cite

View full text Add to dashboard Cite

Radiocarbon (14C) analysis was performed on Japanese cedar (Cryptomeria japonica) tree rings from Koriyama, Fukushima prefecture. Our primary aim was to detect any 14C release from the Fukushima Dai-ichi nuclear power plant accident on 11 March 2011. We also completed and assessed the 14C level in Japanese tree rings for the period of 1990–2014 because of the lack of environmental 14C results in the Japanese island that time. For this reason, we used a trajectory model to investigate the air mass forward and backward trajectories at the area of the power plant and sampling site. The modeling data show that the air masses mainly moved to the Pacific Ocean, both during March 2011 and during the growing season (March–September). During the period 1990–2014 there was no significant 14C excess in any of the samples, but there was a detectable Suess effect in almost every tree ring sample. The average fossil contribution was 0.83 ± 0.01% and the calculated anthropogenic component ratio, the 14C excess varied between +0.5 and –1.6%. The Δ14C value decreased from 150.0‰ to 9.5‰ from 1990–2014, which follows the decline of the 14C bomb peak, in addition to any detectable Suess effect.

show abstract

Section: Methodsmentioning

confidence: 99%

Variation of ¹⁴C in Japanese Tree Rings Related to the Fukushima Nuclear Accident

et al. 2019

Self Cite

View full text Add to dashboard Cite

show abstract

“…A section with an area of 2 cm 2 of each filter was analysed for LVG, MAN and GAN by gas chromatography/mass spectrometry (GC/MS) after trimethylsilylation (Blumberger et al, 2019 Filters collected in parallel on seven overlapping days in each season were subjected to C isotope analysis of the TC content by accelerator mass spectrometry (AMS) with an off-line combustion system (Molnár et al, 2013;Janovics et al, 2018). Carbonaceous aerosol species https://doi.org/10.5194/acp-2019-792 Preprint.…”

Section: Analysis Of Aerosol Samplesmentioning

confidence: 99%

Fossil fuel combustion, biomass burning and biogenic sources of fine carbonaceous aerosol in the Carpathian Basin

Salma¹,

Vasanits-Zsigrai²,

Machon³

et al. 2019

Preprint

Self Cite

View full text Add to dashboard Cite

Abstract. Fine-fraction aerosol samples were collected, air pollutants and meteorological properties were measured in-situ in regional background environment of the Carpathian Basin, a suburban area and central part of its largest city, Budapest in each season for 1 year-long time interval. The samples were analysed for PM2.5 mass, organic carbon (OC), elemental carbon (EC), water-soluble OC (WSOC), radiocarbon, levoglucosan (LVG) and its stereoisomers, and some chemical elements. Carbonaceous aerosol species made up 36&#8201;% of the PM2.5 mass with a modest seasonal variation and with a slightly increasing tendency from the regional background to the city centre (from 32 to 39&#8201;%). Coupled radiocarbon-LVG marker method was applied to apportion the total carbon (TC&#8201;=&#8201;OC&#8201;+&#8201;EC) into contributions of EC and OC from fossil fuel (FF) combustion (ECFF and OCFF, respectively), EC and OC from biomass burning (BB) (ECBB and OCBB, respectively) and OC from biogenic sources (OCBIO). Fossil fuel combustion showed rather constant daily or seasonal mean contributions (of 35&#8201;%) to the TC in the whole year in all atmospheric environments, while the daily contributions of BB and biogenic sources changed radically (from <&#8201;2 up to 70&#8211;85&#8201;%) over the seasons at all locations. In autumn, the three major sources contributed equally to the TC in all environments. In winter, it was the BB that was the major source with a share of 70&#8201;% at all sites. The contributions from biogenic sources in winter were the smallest, although they were still non-negligible with an increasing share (from 5 to 8&#8201;%) from the regional background to the urban sites. In spring, FF combustion and biogenic sources were the largest two contributors at all locations with typical shares of 45&#8211;50&#8201;% each. In summer, biogenic sources became the major source with a monotonically increasing tendency (from 56 to 72&#8201;%) from the city centre to the regional background. The share of BB was hardly quantifiable in summer. The ECFF made up more than 90&#8201;% of EC in spring and summer, while in autumn and winter, the contributions of ECBB were considerable. Biomass burning in winter and autumn offers the largest and considerable potentials for improving the air quality in cities as well as in rural areas of the Carpathian Basin.

show abstract

“…After the chemical preparation, samples were redried in freeze-dryer. 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).…”

Section: Methodsmentioning

confidence: 99%

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

et al. 2018

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Sealed Tube Combustion Method with MnO₂ for AMS ¹⁴C Measurement

Cited by 34 publications

References 26 publications

Variation of ¹⁴C in Japanese Tree Rings Related to the Fukushima Nuclear Accident

Variation of ¹⁴C in Japanese Tree Rings Related to the Fukushima Nuclear Accident

Fossil fuel combustion, biomass burning and biogenic sources of fine carbonaceous aerosol in the Carpathian Basin

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

Contact Info

Product

Resources

About

Sealed Tube Combustion Method with MnO2 for AMS 14C Measurement

Cited by 34 publications

References 26 publications

Variation of 14C in Japanese Tree Rings Related to the Fukushima Nuclear Accident

Variation of 14C in Japanese Tree Rings Related to the Fukushima Nuclear Accident

Fossil fuel combustion, biomass burning and biogenic sources of fine carbonaceous aerosol in the Carpathian Basin

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

Contact Info

Product

Resources

About

Sealed Tube Combustion Method with MnO₂ for AMS ¹⁴C Measurement

Variation of ¹⁴C in Japanese Tree Rings Related to the Fukushima Nuclear Accident

Variation of ¹⁴C in Japanese Tree Rings Related to the Fukushima Nuclear Accident