ePIC

From mass to structure: An aromaticity index for high-resolution mass data of natural organic matter

Edit Item Edit Item

General Information:

Citation:
Koch, B. and Dittmar, T. (2006): From mass to structure: An aromaticity index for high-resolution mass data of natural organic matter , Rapid communications in mass spectrometry, 20 (5), pp. 926-932 . doi: 10.1002/rcm.2386
Cite this page as:
DOI:
Official URL:
Contact Email:
Download:

[img]
Preview
PDF (Fulltext)
Koc2005f.pdf

Download (422Kb) | Preview
Cite this document as:
Supplementary Information:

Campaigns:
Abstract:

Recent progress in Fourier transform ion cyclotron resonance mass spectrometry (FTICRMS) provided extensive molecular mass data for complex natural organic matter (NOM). Structural information can be deduced solely from the molecular masses for ions with extreme molecular element ratios, in particular low H/C ratios, which are abundant in thermally altered NOM (e.g. black carbon). In this communication we propose a general aromaticity index (AI) and two threshold values as unequivocal criteria for the existence of either aromatic (AI > 0.5) or condensed aromatic structures (AI >= 0.67) in NOM. AI can be calculated from molecular formulae which are derived from exact molecular masses of naturally occurring compounds containing C, H, O, N, S and P and is especially applicable for substances with aromatic cores and few alkylations. In order to test the validity of our model index, AI is applied to FTICRMS data of a NOM deep-water sample from the Weddell Sea (Antarctica), a fulvic acid standard and an artificial dataset of all theoretically possible molecular formulae. For graphical evaluation a ternary plot is suggested for four-dimensional data representation. The proposed aromaticity index is a step towards structural identification of NOM and the molecular identification of black carbon in the environment.

Further Details:

Imprint
AWI
Policies:
read more
OAI 2.0:
http://epic.awi.de/cgi/oai2
ePIC is powered by:
EPrints 3