Exploring the high-mass components of humic acid by laser desorption ionization mass spectrometry |
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Authors: | Chilom Gabriela Chilom Ovidiu Rice James A |
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Institution: | Department of Chemistry & Biochemistry, South Dakota State University, Brookings, SD 57007, USA. |
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Abstract: | Leonardite and Elliot soil humic acids have been analyzed by laser desorption ionization mass spectrometry (LDI MS) in the m/z 4000-200,000 range. Positive ion mass spectra for each humic acid obtained under optimum conditions showed a broad high-mass distribution between m/z 20,000 and 80,000. The dependence of the mass distribution on instrumental parameters and solution conditions was used to investigate the nature of the high-mass peaks from humic acid spectra. Our data suggests that macromolecular ions and humic acid aggregates have the same probability of occurrence while cluster ion formation has a low probability of occurrence. |
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