Determination of allophane in clay and humus-clay complexes [Andosols]

analisis analyse analyse chimique analysis andosol andosoles andosols chemical analysis clay soils colloids coloides composition dispersion dispersions environment environnement genetic soil types humus lithological soil types medio ambiente methode methods organic acid salts organic compounds organic matter content oxalate oxalates oxalatos physical states sel d'acide organique site factors soil types sol argileux suelo arcilloso textural soil types tipos texturales de suelos type de sol type de sol lithologique type de sol textural