Evaluation of pyrophosphate- extractable Fe from each horizon of an argentinian soil profile

A. MIJOVILOVICH; C. P. RAMOS; C. SARAGOVI; S. G. ACEBAL; E. H. RUEDA; M. E. AGUIRRE

Río de Janeiro

Conferencia; International Conference on Applications of the Mössbauer Effect (ICAME-1997).; 1997

Sodium pyrophosphate (0.1 M, pH10) is commonly used to extract iron and aluminium from soil organic complexes, but there is evidence that in some soils it also extracts non-organic forms. A Mössbauer study of the effect of Na-pyrophosphate treatment on the Fe extraction on a Mollisol (<50 microns fraction) from Bahía Blanca, Argentina is presented. Samples from different horizons, Ap, A1, AC and Ck, were measured before and after treatment. Spectra were fitted using two doublets and two sextets distributions. From the areas results, the variation of the Fe content with depth is discussed. Comparison with the obtained chemical data is made.