Molecular-level characterization of dissolved organic matter (DOM) has been challenging due to the inherent complexity of natural organic mixtures. The soft electrospray ionization combined with the ultra high resolution and mass accuracy of compounds can be achieved in Fourier transform ion cyclotron resonance mass spectrometer (FT ICR MS). With this technique, molecular-level changes can be detected as a function of biogeochemical processes such as microbial and photochemical processes. Here we present the results of the effects of photoirradiation on the molecular composition of DOM in Hudson Bay. Photoproduced compounds were more predominant in river and coastal samples relative to Hudson Bay samples. Hierarchical clustering analyses revealed that riverine and estuarine DOM was more altered than coastal DOM, suggesting a greater photoalteration of allochthonous DOM, thereby complicating the task of tracking terrestrial DOM in open marine waters.<br/>

Insights on photochemical degradation of dissolved organic matter from electrospray ionization Fourier transform ion cyclotron resonance mass spectrometry

2019 Fall National Meeting

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