Isolation and 14C analysis of humic-like substances (HULIS) from ambient aerosol samples

Vonwiller, Matthias; Salazar Quintero, Gary Abdiel; Szidat, Sönke (3 July 2017). Isolation and 14C analysis of humic-like substances (HULIS) from ambient aerosol samples. In: 2nd International Radiocarbon in the Environment Conference. Debrecen, Hungary. 03.-07.07.2017.

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HUmic-LIke Substances (HULIS) are an unresolved complex mixture of organic compounds, which accounts for 12-60% of the total organic carbon (OC) in ambient aerosols (Graber and Rudich, 2006). As the characterization of HULIS is still incomplete and because their composition and amount is strictly method-dependent, a meaningful comparison of different studies about this class of compounds is difficult. Testing of different isolation methodologies resulted in a straightforward HULIS extraction procedure for 14C source apportionment by accelerator mass spectrometry (14C-AMS). The presented methodology corresponds to a modified method of Varga et al. (2001). The complete procedure is summarized as a flow chart in Fig. 1. The procedure blank was quantified in terms of its mass and its 14C/12C ratio by isotopic dilution analysis using a fossil and a modern reference material. Due to this blank, the sample mass for the AMS measurement should exceed 20 µg C for an adequate accuracy and precision of 14C data. The application of the presented method on different ambient aerosol filters strongly indicates modern sources for HULIS.

Item Type:

Conference or Workshop Item (Abstract)

Division/Institute:

10 Strategic Research Centers > Oeschger Centre for Climate Change Research (OCCR)
08 Faculty of Science > Departement of Chemistry and Biochemistry

UniBE Contributor:

Vonwiller, Matthias; Salazar Quintero, Gary Abdiel and Szidat, Sönke

Subjects:

500 Science > 540 Chemistry

Language:

English

Submitter:

Sönke Szidat

Date Deposited:

16 Apr 2018 11:07

Last Modified:

26 Oct 2019 22:59

Related URLs:

BORIS DOI:

10.7892/boris.108864

URI:

https://boris.unibe.ch/id/eprint/108864

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