Advanced

Mass and UV-visible spectral fingerprints of dissolved organic matter : Sources and reactivity

Reader, Heather E. LU ; Stedmon, Colin A; Nielsen, Nikoline J and Kritzberg, Emma S. LU (2015) In Frontiers in Marine Science 2(OCT).
Abstract

Advanced analytical techniques have revealed a high degree of complexity in the chemical makeup of dissolved organic matter (DOM). This has opened the door for a deeper understanding of the role of DOM in the aquatic environment. However, the expense, analytical cost, and challenges related to interpretation of the large datasets generated by these methods limit their widespread application. Optical methods, such as absorption and fluorescence spectroscopy are relatively inexpensive and easy to implement, but lack the detailed information available in more advanced methods. We were able to directly link the analysis of absorption spectra to the mass spectra of DOM using an in-line detector system coupled to multivariate data analysis.... (More)

Advanced analytical techniques have revealed a high degree of complexity in the chemical makeup of dissolved organic matter (DOM). This has opened the door for a deeper understanding of the role of DOM in the aquatic environment. However, the expense, analytical cost, and challenges related to interpretation of the large datasets generated by these methods limit their widespread application. Optical methods, such as absorption and fluorescence spectroscopy are relatively inexpensive and easy to implement, but lack the detailed information available in more advanced methods. We were able to directly link the analysis of absorption spectra to the mass spectra of DOM using an in-line detector system coupled to multivariate data analysis. Monthly samples were taken from three river mouths in Sweden for 1 year. One subset of samples was exposed to photochemical degradation and another subset was exposed to long-term (4 months) biological degradation. A principle component analysis was performed on the coupled absorption-mass spectra data. Loading spectra for each principle component show distinct fingerprints for both reactivity (i.e., photochemical, biological degradation) and source (i.e., catchment land cover, temperature, hydrology). The fingerprints reveal mass-to-charge values that contribute to optical signals and characteristics seen in past studies, and emphasize the difficulties in interpreting changes in bulk CDOM characteristics resulting from multiple catchment processes. The approach provides a potential simple method for using optical indicators as tracers for more complex chemical processes both with regards to source material for DOM and the past reactive processing of DOM.

(Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Absorbance spectra, Biogeochemistry, Dissolved organic matter, Mass spectrometry, Optical properties
in
Frontiers in Marine Science
volume
2
issue
OCT
publisher
Frontiers Media S. A.
external identifiers
  • scopus:85008625504
DOI
10.3389/fmars.2015.00088
language
English
LU publication?
yes
id
2afb4434-6eb4-453b-acbd-7571cd21f253
date added to LUP
2017-02-16 13:20:37
date last changed
2017-09-24 05:07:20
@article{2afb4434-6eb4-453b-acbd-7571cd21f253,
  abstract     = {<p>Advanced analytical techniques have revealed a high degree of complexity in the chemical makeup of dissolved organic matter (DOM). This has opened the door for a deeper understanding of the role of DOM in the aquatic environment. However, the expense, analytical cost, and challenges related to interpretation of the large datasets generated by these methods limit their widespread application. Optical methods, such as absorption and fluorescence spectroscopy are relatively inexpensive and easy to implement, but lack the detailed information available in more advanced methods. We were able to directly link the analysis of absorption spectra to the mass spectra of DOM using an in-line detector system coupled to multivariate data analysis. Monthly samples were taken from three river mouths in Sweden for 1 year. One subset of samples was exposed to photochemical degradation and another subset was exposed to long-term (4 months) biological degradation. A principle component analysis was performed on the coupled absorption-mass spectra data. Loading spectra for each principle component show distinct fingerprints for both reactivity (i.e., photochemical, biological degradation) and source (i.e., catchment land cover, temperature, hydrology). The fingerprints reveal mass-to-charge values that contribute to optical signals and characteristics seen in past studies, and emphasize the difficulties in interpreting changes in bulk CDOM characteristics resulting from multiple catchment processes. The approach provides a potential simple method for using optical indicators as tracers for more complex chemical processes both with regards to source material for DOM and the past reactive processing of DOM.</p>},
  articleno    = {88},
  author       = {Reader, Heather E. and Stedmon, Colin A and Nielsen, Nikoline J and Kritzberg, Emma S.},
  keyword      = {Absorbance spectra,Biogeochemistry,Dissolved organic matter,Mass spectrometry,Optical properties},
  language     = {eng},
  number       = {OCT},
  publisher    = {Frontiers Media S. A.},
  series       = {Frontiers in Marine Science},
  title        = {Mass and UV-visible spectral fingerprints of dissolved organic matter : Sources and reactivity},
  url          = {http://dx.doi.org/10.3389/fmars.2015.00088},
  volume       = {2},
  year         = {2015},
}