Aquatic Humic Substances
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چکیده
4 Chemical Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 306 4.1 Elemental Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 307 4.2 Molecular Size Distribution and Charge . . . . . . . . . . . . . . . . . . . . . . 309 4.3 Spectral Absorbance and Fluorescence . . . . . . . . . . . . . . . . . . . . . . . 311 4.4 Infrared Spectra . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 312 4.5 Mass Spectrometry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 315 4.6 NMR Spectroscopy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 316 4.7 Soft Hydrolysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 316
منابع مشابه
Aquatic humic substances, iron and manganese removal by ultrafiltration and nanofiltration membranes combined with coagulation-flocculation- sedimentation
Surface water and groundwater sources for human supply require treatment to remove substances that can cause human diseases and rejection. Aquatic humic substances, such as iron and manganese, interfere with the aesthetic and sanitary quality of the water because they cause color, odor and taste unpleasant. In addition, humic substances can form trihalomethanes which are serious harmful substan...
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Humic substances, i.e. dark paramagnetic polymeric anionic polyelectrolytes, belong to the most widespread macromolecular substances of biogenic origin in soil and aquatic environments. The exact structure of humic substances is unknown because of their complexity resulting from unrecurring precursors, from their composition and their process of synthesis. Degradation processes of these substan...
متن کاملAtmospheric HULIS: How humic-like are they? A comprehensive and critical review
A class of organic molecules extracted from atmospheric aerosol particles and isolated from fog and cloud water has been termed HUmic-LIke Substances (HULIS) due to a certain resemblance to terrestrial and aquatic humic and fulvic acids. In light of the interest that this class of atmospheric compounds currently attracts, we comprehensively review HULIS properties, as well as laboratory and fie...
متن کاملThe density of humic acids and humic like substances (HULIS) from fresh and aged wood burning and pollution aerosol particles
Atmospheric aerosols play significant roles in climatic related phenomena. Size, density and shape of particles affect their fluid-dynamic parameters which in turn dictate their transport and lifecycle. Moreover, density and shape are also related to particles’ optical properties, influencing their regional and global radiative effects. In the present study we have measured and compared the eff...
متن کاملA method for quantitative analysis of aquatic humic substances in clear water based on carbon concentration.
Aquatic humic substances (AHSs) are major constituents of dissolved organic matter (DOM) in freshwater, where they perform a number of important ecological and geochemical functions, yet no method exists for quantifying all AHSs. We have developed a method for the quantitative analysis of AHSs based on their carbon concentration. Our approach includes: (1) the development of techniques for cl...
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