Abstract
To obtain background information to formulate a strategy to keep lakes, marshes and bogs free from pollution, soil and peat were sampled and analyzed. Sample preparation, size segregation and chemical extraction with ultra-pure water, 0.2M (NH 4) 2C 2O 4, 1M CH 3COONH 4, 0.01M EDTA · 2Na, 1N HCl and 6N HCl were undertaken prior to the normal PIXE target preparation. It was found that the extraction rates of metal elements by oxalate ion decrease with increasing complex formation by the interaction of the metal ions with humic compounds. The extraction rate of Mn by ammonium oxalate solution is low, in spite of relatively low complex formation with humic compounds, presumably because the water-insoluble inorganic colloid (MnO 2) is readily formed. The values of the extraction rate nearly correspond to the chelate-formation constants of the metal ions with EDTA. P and S were both effectively extracted by ammonium acetate.
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