Characterization of dissolved organic matter in Lake Superior and its watershed using ultrahigh resolution mass spectrometry
Date
2011-11-14Author
Minor, Elizabeth C.
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Steinbring, Carla J.
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Longnecker, Krista
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Kujawinski, Elizabeth B.
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https://hdl.handle.net/1912/5072As published
https://doi.org/10.1016/j.orggeochem.2011.11.007Keyword
Dissolved organic matter; Natural organic matter; Electrospray ionization; Fourier-transform ion cyclotron resonance mass spectrometry; Ultrahigh resolution mass spectrometry; Lake Superior; Van Krevelen diagram; Cluster analysis; LakesAbstract
With the advent of ultrahigh resolution mass spectrometry, recent studies
have begun to resolve molecular-level relationships between terrestrial and
aquatic dissolved organic matter (DOM) in rivers, estuaries, mangrove
swamps and their receiving oceans and lakes. Here, we extend ultrahigh
resolution mass spectrometry techniques to Lake Superior, the largest
freshwater lake in the world by area. Solid-phase extracted samples from the
western arm of the lake and its watershed, including swamp, creek, river,
lake-river confluence and offshore lake sites were compared using
electrospray ionization (ESI) Fourier transform ion cyclotron resonance mass
spectrometry (FT-ICR-MS). Results were analyzed using cluster analysis and
van Krevelen diagrams. Chemical similarity appears related to hydrological proximity, terrestrial impact and flow conditions. For example, higher and
lower flow samples from the same stream differ from one another. Toivola
Swamp, Lake Superior, and the south shore river have diverse arrays of
unique molecular formulae.relative to the north shore river and stream
sampled in this data set. Lake Superior’s unique elemental formulae,
relative to its watershed samples, are primarily in the lignin-like and reduced
hydrocarbon regions of van Krevelen diagrams. ESI-amenable Lake Superior
DOM also has a higher proportion of formulae containing nitrogen or sulfur
relative to the other samples. The degree of overlap among formulae within
our data set is consistent with previous ESI FT-ICR-MS characterization of terrestrial, estuarine and marine OM. There appears to be a conserved
portion of formulae across natural OM samples, perhaps because these
compounds are intrinsically refractory or because they are commonly
generated as products of natural reworking processes.
Description
Author Posting. © The Author(s), 2011. This is the author's version of the work. It is posted here by permission of Elsevier B.V. for personal use, not for redistribution. The definitive version was published in Organic Geochemistry 43 (2012): 1-11, doi:10.1016/j.orggeochem.2011.11.007.
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Suggested Citation
Preprint: Minor, Elizabeth C., Steinbring, Carla J., Longnecker, Krista, Kujawinski, Elizabeth B., "Characterization of dissolved organic matter in Lake Superior and its watershed using ultrahigh resolution mass spectrometry", 2011-11-14, https://doi.org/10.1016/j.orggeochem.2011.11.007, https://hdl.handle.net/1912/5072Related items
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