Sample

CHEMICAL DETAILS SAMPLE ORIGIN SAMPLE PREP./SIZE PYROL. CONDITIONS TOTAL ION COUNTS

HUMIC ACID (from a Podzol) see ref. 185 NW Spain suspension in methanol; approx. 25 pg standard not determined

REMARKS - Although superficially rather similar to fulvic acid (Spectrum F.5), this humic acid spectrum shows much higher peak series indicating the presence of nitrogen-containing (m/z 17, 67, 79, 117), sulphur-containing (m/z 34, 48) and aromatic (m/z 78, 92, 94, 104, 106, 124) fragments. As most of these signals are also encountered in pyrolysis mass spectra of proteins this suggests a significant contribution of proteinaceous compounds.

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