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We dissolved and fractionated the commercially available Aldrich humic acid (AHA) into less than 1000 and less than 8000 atomic mass unit (amu) fractions and used 1 H NMR to analyze the chemical forms of dissolved organic matter (DOM) of these two AHA fractions in D 2 O. The range of linewidths of the signals observed in the 1 H NMR spectra of the different molecular mass...
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