Calorimetric acid-based titrations of aquatic and peat-derived fulvic and humic acids

Article Abstract:

The protonation and ionization enthalpies of aquatic and peat-derived fulvic and humic acids can be analysed using titration calorimetry. Results show that ionization and protonation enthalpies are not entirely the same, with the enthalpies connected with proton binding and release being shown more directly in protonation enthalpies. Ionic strength, titration direction and counter cation type do not have a direct effect on the volume of protons bound by the fulvic and humic acids investigated, but further research at high and low pH values is required to give full data on this matter.

Industrial organic chemicals, not elsewhere classified, Acids

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Quantitative study of Be(II) complexation by soil fulvic acids by molecular fluorescence spectroscopy

Article Abstract:

Strong complexation at almost neutral pH was observed in the interaction of beryllium ion (Be(II)) with soil fulvic acids (fua) by synchronous fluorescence spectroscopy and evolving factor analysis. Results reveal that Be(II) associates strongly with fua, forming soluble complexes in the absence of other potential complexing agents or adsorbents. Complexation of Be(II) by fua takes place at nearly neutral pH, which suggests that fua may be affecting remarkably the mobility of Be(II) in the environment.

Primary nonferrous metals, not elsewhere classified, Primary Smelting and Refining of Nonferrous Metal (except Copper and Aluminum), Beryllium, Analysis, Usage, Fluorescence spectroscopy

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Characterization of fulvic acid by laser-desorption mass spectrometry

Article Abstract:

Fulvic acid is characterized by a heterogeneous organic substances that were formed by naturally-occurring organic materials. Substantial research has been devoted to the complex's geochemical applications, but has yielded minimal information on its molecular weigh distribution. Laser-desorption Fourier transform mass spectrometry shows that low molecular weight substances dominate the composition of fulvic acid.

Composition, Plasma desorption mass spectrometry

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