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Evidence of goethite in pyrophosphate and tetraborate sandstone extracts from portugal


, : Evidence of goethite in pyrophosphate and tetraborate sandstone extracts from portugal. Canadian Journal of Soil Science 64(4): 505-514

Five chemical reagents (citrate-bicarbonate-dithionite, oxalate, EDTA, pyrophosphate and tetraborate), generally used for studying Fe forms, were applied to sandy soils from Portugal. The results emphasized anomalies in the order of efficiency of these reagents. In deep horizons particularly, a greater extractibility of Fe by pyrophosphate, and sometimes by tetraborate, than with oxalate was noted. After separating particles in suspension in pyrophosphate and tetraborate extracts, it was shown that these particles were not entirely soluble in oxalate, and that they consisted of goethite, well-identified by X-ray diffraction and IR spectroscopy. Fe, present as particles in the peptizing reagents, such as pyrophosphate and tetraborate, was not only in the amorphous organic complex state. These results confirm those obtained by Schuppli et al. (1983) for pyrophosphate, but are new for tetraborate.

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