Polymerization of humic substances catalyzed by iron and manganese porphirins

Spettroscopia 31P-NMR per la caratterizzazione del fosforo nei suoli

Analisi delle interazioni tra sostanze umiche e cationi metallici mediante CPMAS 13C NMR

Distribution of a 13C-labelled hydrophobic tracer over humic fractions of different size and composition

Caratterizzazione molecolare di frazioni lipidiche ottenute da acidi umici differenti mediante risonanza magnetica nucleare (NMR) e spettrometria di massa (MS)

Carbohydrates and aggregation in lowland soils of Nigeria as influenced by organic input

Evaluation of the factors affecting direct polarization solid state (31)P-NMR spectroscopy of bulk soils

Summary 31 P-NMR spectroscopy on bulk soils is a powerful tool for the identification of the different phosphorus forms in soils and for the evaluation of the dynamics of soil P. Up to now the majority of the papers dealt with liquid state 31 P-NMR spectroscopy on soluble soil organic substances. Only few papers were addressed to the study of the different phosphorus forms directly in bulk soils. In the present paper, some organic and inorganic phosphates of known structures, which are likely to be present in soil systems, were studied by direct polarization (DP) magic angle spinning (MAS) 31 P-NMR spectroscopy in order to understand the electronic factors responsible for chemical shifts of…