NDLI: Chemical properties of HULIS from three different environments

Content Provider	Springer Nature Link
Author	Kristensen, T. B. Du, L. Nguyen, Q. T. Nøjgaard, J. K. Koch, C. Bender Nielsen, O. Faurskov Hallar, A. G. Lowenthal, D. H. Nekat, B. Pinxteren, D. van Herrmann, H. Glasius, M. Kjaergaard, H. G. Bilde, M.
Copyright Year	2015
Abstract	Humic-like substances (HULIS) comprise a significant fraction of the organic compounds in aerosol particles. In the present study we report the chemical properties of HULIS samples originating from urban (Copenhagen, Denmark), rural (Melpitz, Germany) and remote (Storm Peak Laboratory, CO, USA) environments. Suwannee River Fulvic Acid Standard (SRFA) was included in the study as a reference. Raman, Fourier transform infrared (FTIR) and ultraviolet-visible (UV-Vis) spectroscopy were used together with high performance liquid chromatography-mass spectrometry (HPLC-MS) for characterisation of the samples. The same main functional groups were present in all samples, but the relative abundance of functional groups varied among the studied samples, which was mainly evident from the FTIR spectra. The urban and rural samples were found to be very similar with respect to the relative abundance of functional groups. The remote sample contained relatively more C=O and COOH groups, which may be due to the remote environment. Organonitrates appeared to be present in the three atmospheric samples, while it did not appear to be present in the SRFA. The SRFA sample comprised significantly larger amounts of aromatic groups relative to the atmospheric samples in line with previous findings. All the obtained mass spectra showed clear periods of 14-16 Da in line with previous studies. The estimated average molecular weight (AMW) was comparable for the atmospheric samples within the errors - while the AMW of SRFA was higher. In general the atmospheric HULIS samples from different environments were rather similar with respect to the properties investigated.
Starting Page	65
Ending Page	80
Page Count	16
File Format	PDF
ISSN	01677764
Journal	Journal of Atmospheric Chemistry
Volume Number	72
Issue Number	1
e-ISSN	15730662
Language	English
Publisher	Springer Netherlands
Publisher Date	2015-04-07
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	HULIS FTIR Raman UV-Vis HPLC-MS Atmospheric Sciences Atmospheric Protection/Air Quality Control/Air Pollution
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Atmospheric Science

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