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Full-Text Articles in Physical Sciences and Mathematics
A Mini-Electrodialysis System For Desalting Small Volume Saline Samples For Fourier Transform Ion Cyclotron Resonance Mass Spectrometry, Hongmei Chen, Aron Stubbins, Patrick G. Hatcher
A Mini-Electrodialysis System For Desalting Small Volume Saline Samples For Fourier Transform Ion Cyclotron Resonance Mass Spectrometry, Hongmei Chen, Aron Stubbins, Patrick G. Hatcher
Chemistry & Biochemistry Faculty Publications
An affordable, commercially available mini-electrodialysis (mini-ED) system has been evaluated for the efficient desalting of small volume samples of seawater before analysis by electrospray Fourier transform ion cyclotron resonance mass spectrometry (ESI FT-ICR MS). Mini-ED FT-ICR mass spectra were compared with spectra for samples that were treated by C18 solid phase extraction, a commonly used method for rapid sample preparation for this type of analysis. In this comparison, it is clear that mini-ED provides more representative molecular information, compared with C18 isolation, and recovers the overwhelming majority of peaks from salt-free samples, indicating that it adequately represents the …
Characterization Of Heterogeneities And Domains In Aquatic And Sedimentary Organic Matter By 1 H Spin Diffusion: Potential For Elucidating The Formation Mechanisms, Jingdong Mao, Xiaoyan Cao
Characterization Of Heterogeneities And Domains In Aquatic And Sedimentary Organic Matter By 1 H Spin Diffusion: Potential For Elucidating The Formation Mechanisms, Jingdong Mao, Xiaoyan Cao
Chemistry & Biochemistry Faculty Publications
Although the information on domains and heterogeneities of natural organic matter (NOM) can provide insights into its formation mechanisms, the appropriate solid-state NMR technique for measuring them is still lacking. The traditional technique requires mobility differences in NOM whereas NOM components are primarily rigid. We introduced a new 1H spin diffusion technique, 1H-13C two-dimensional heteronuclear correlation (2D HETCOR) NMR with 1H spin diffusion, for characterization of domains and heterogeneities in aquatic and sedimentary organic matter. It was achieved by collecting a series of 2D HETCOR spectra with a variable mixing time, tm', and …