Evaluation of an automated EA-IRMS method for total carbon analysis of atmospheric aerosol at HEKAL

Major, István; Gyökös, Brigitta; Túri, Marianna; Futó, István; Filep, Ágnes; Hoffer, András; Furu, Enikő; Jull, A. J. T.; Molnár, Mihály

doi:10.1007/s10874-017-9363-y

Cited by 10 publications

(6 citation statements)

References 21 publications

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“…TC was converted to CO 2 by an off-line combustion method using sealed tubes and manganese-oxide reagent. After combustion at 550 • C for 3 days, the produced CO 2 was purified and graphitized [32]. The 14 C/ 12 C ratios were measured by a MICADAS type accelerator mass spectrometer, at the Hertelendi Laboratory of Environmental Studies (HEKAL), Institute for Nuclear Research in Debrecen, Hungary.…”

Section: Radiocarbon Analysis Of the Tc Fractionmentioning

confidence: 99%

Detailed Carbon Isotope Study of PM2.5 Aerosols at Urban Background, Suburban Background and Regional Background Sites in Hungary

et al. 2022

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The aim of this study was to estimate and refine the potential sources of carbon in the atmospheric PM2.5 fraction aerosol at three sampling sites in Hungary. Quantification of total, organic and elemental carbon (TC, OC and EC, respectively), as well as radiocarbon (14C) and stable carbon isotope analyses were performed on exposed filters collected at an urban background site, a suburban background site of the capital of Hungary, Budapest from October 2017 to July 2018. Results were also collected from the rural regional background site of K-puszta. Compared to TC concentrations from other regions of Europe, the ratio of the lowest and highest values at all sites in Hungary are lower than these European locations, probably due to the specific meteorological conditions prevailing in the Carpathian Basin over the observation period. The concentration of OC was constantly higher than that of EC and a seasonal variation with higher values in the heating period (October–March) and lower values in the non-heating vegetation period (April–September) could be observed for both EC and OC fractions. Using 14C, the seasonal mean fraction of contemporary carbon (fC) within the TC varied between 0.50 and 0.78 at the sites, suggesting that modern sources were remarkable during the year, regardless of the heating or vegetation period. At the two urban sites, assuming constant industrial emission during the year, the fossil fuel combustion sources were responsible for the seasonal variation of EC, while modern carbon emissions from biomass-burning and biogenic sources influenced the OC concentration. The higher EC/TC ratios at these sites were associated with lower fC and δ13C values, which can be explained by soot emission from transportation. The notably high EC/TC ratios in the spring were likely caused by the reduced concentration of OC instead of increased EC concentrations. This could probably be caused by the ending of winter biomass burning, which emits a huge amount of OC into the atmosphere. On the contrary, the rural K-puszta site showed some differences relative to the sites in Budapest. No correlation could be revealed between the EC/TC ratio, fC and δ13C results, suggesting that the structure of sources was very stagnant and balanced in each season. In autumn, however, some less depleted values were observed, and agricultural corn-stalk burning after harvesting in the southern and eastern directions from Hungary can be suggested as the main source.

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Section: Radiocarbon Analysis Of the Tc Fractionmentioning

confidence: 99%

Detailed Carbon Isotope Study of PM2.5 Aerosols at Urban Background, Suburban Background and Regional Background Sites in Hungary

et al. 2022

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“…Cellulose (0.30 ± 0.02 mg) was weighed into silver capsules, and samples were prepared for oxygen isotope analysis using a Thermo Finnigan TC/ EA (temperature conversion elemental analyzer) equipped with a zero-blank autosampler (Kéri et al 2015). Samples for carbon stable isotope measurements were prepared with a Fisons Instruments NA 1500 NCS elemental analyzer, with 0.65-0.70 mg of cellulose sample weighed into aluminum capsules and dropped into the autosampler of the elemental analyzer (Major et al 2018 (Saurer et al 1998;Kéri et al 2015). For d 13 C, we used IAEA-C3 cellulose (-24.91%, VPDB) and an in-house sulfanilamide standard (226.69%, VPDB).…”

Section: Sphagnum Cellulose Sample Preparation and Stable Isotope Analysismentioning

confidence: 99%

Holocene paleoclimate inferred from stable isotope (δ18O and δ13C) values in Sphagnum cellulose, Mohos peat bog, Romania

et al. 2021

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We measured stable isotopes (δ18O and δ13C) in Sphagnum cellulose that was extracted from a long peat core drilled in the ombrotrophic Mohos peat bog, Ciomadul Mountain, Romania. The 10-m-long peat profile spans the period from 11,800 cal yr BP to present. The δ18O and δ13C data indicate there were several cooling events and warm periods in the area of the Mohos peat bog during the Holocene. The 8.2-ka cold event, however, was not detected using δ18O and δ13C values. Response of the peat bog to changing environmental conditions was inferred using data on organic matter accumulation, independent of the stable isotope results. All cool periods during the Holocene, whether of short or long duration, were identified as times of reduced organic matter accumulation rate. Similarly, dry periods were also correlated with reduced accumulation rates of organic matter.

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“…on 18-21, 25 and 26 October; on 10-16 January; on 17-23 April; and on 17-23 July 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 in the eighth section of each filter were oxidised quantitatively to CO 2 gas (Major et al, 2018). This was later introduced into an IonPlus Enviro Mini Carbon Dating System spectrometer (Switzerland) via its dedicated gas ion source interface.…”

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,

Machon

et al. 2020

Atmos. Chem. Phys.

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Abstract. Fine-fraction aerosol samples were collected, and air pollutants and meteorological properties were measured in situ in the regional background environment of the Carpathian Basin, a suburban area and central part of its largest city, Budapest, in each season for a 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 % 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 %). A coupled radiocarbon-LVG marker method was applied to apportion the total carbon (TC = OC + 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 monthly mean contributions (of 35 %) to the TC in the whole year in all atmospheric environments, while the daily contributions of BB and biogenic sources changed radically (from <2 % up to 70 %–85 %) at all locations and over the years. In October, the three major sources contributed equally to the TC in all environments. In January, it was the BB that was the major source, with a share of 70 % at all sites. The contributions from biogenic sources in January were the smallest. In April, FF combustion and biogenic sources were the largest two contributors at all locations with typical shares of 45 %–50 % each. In July, biogenic sources became the major source type with a monotonically increasing tendency (from 56 % to 72 %) from the city centre to the regional background. The share of BB was hardly quantifiable in July. The ECFF made up more than 90 % of EC in April and July, while in October and January, the contributions of ECBB were considerable. Biomass burning in winter and autumn offers the largest and most considerable potential for improving the air quality in cities as well as in rural areas of the Carpathian Basin.

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Evaluation of an automated EA-IRMS method for total carbon analysis of atmospheric aerosol at HEKAL

Cited by 10 publications

References 21 publications

Detailed Carbon Isotope Study of PM2.5 Aerosols at Urban Background, Suburban Background and Regional Background Sites in Hungary

Detailed Carbon Isotope Study of PM2.5 Aerosols at Urban Background, Suburban Background and Regional Background Sites in Hungary

Holocene paleoclimate inferred from stable isotope (δ18O and δ13C) values in Sphagnum cellulose, Mohos peat bog, Romania

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

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