Abstract
Sequential extraction and solid state 31P NMR spectroscopy were used to investigate the relative solubility of phosphorus (P) in a series of soils under permanent grassland in New Zealand. This involved comparing spectra of unextracted soil with residual soil after extraction with 1 M NH4Cl–0.1 M NaOH and 1 M NH4Cl–0.1 M NaOH–0.5 M H2SO4. Results confirmed that alkali extraction selectively removed P associated with aluminum (Al) and iron (Fe), while subsequent extraction with acid removed calcium (Ca)-P. This indicates that fractionation schemes can be used to isolate categories of P species involved in soil P cycling and the added value of solid state NMR for the analysis of soil P species in situ.
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