Sample

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

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

REMARKS - The overall pattern is that of a carbohydrate material. Compared with the soil polysaccharide (Spectrum F.4), however, this spectrum is far more simple since it lacks ion series indicative of N-acetyl aminosugars and pentose or deoxyhexose residues. Moreover, the absence of a well marked peak at m/z 102 warns that we may not be dealing with a simple hexose polymer. Also, major peaks at m/z 16, 28, 41, 42, apparently indicating the presence of aliphatic hydrocarbon moieties, are unusual for polysaccharide patterns. Although varying amounts of carbohydrate material are often found in fulvic acids, depending on the preparation techniques used, the "core" of fulvic acids may be made up of polycarboxylic, e.g. polymaleic, acids rather than carbohydrates as shown by recent Py-GC/MS studies (ref. 181).

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