CHEMICAL DETAILS SAMPLE ORIGIN SAMPLE PREP./SIZE PYROL. CONDITIONS TOTAL ION COUNTS
: HUMIC ACID (from a forest soil) : see ref. 185 : Canada
: suspension in methanol; approx. 25 yg : standard : not determined remarks - In spite of the strong qualitative resemblance to humic acid from Podzol (Spectrum F.6) a marked series of intense peaks at m/z 124, 138, 150, 164 easily distinguishes the two spectra. These signals appear to be derived from guaiacylic lignin moieties, obviously corresponding to the presence of sizeable amounts of incompletely degraded plant material in the upper horizons of the forest soil.
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