Abstract
On the basis of a critical review on conventional fractionation schemes of inorganic phosphate and further study of chemical behaviors of Ca-P and Fe-P in calcareous soils, a systematic scheme for the separation of soil inorganic phosphates in calcareous soils is suggested. In the scheme calcium phosphate is classified into dicalcium phosphate, octacalcium phosphate and apatite types, and Ca2-P is extracted by NaHCO3 solution, Ca8-P by NH4Ac, Al-P by NH4F, Fe-P by NaOH-Na2CO3, occluded-P by Na3Cit-Na2S2O4-NaOH, and Ca10-P by H2SO4. Synthetic phosphates prepared of which the chemical and physical assay show good consonance with the theoretical value were used in experiment, the recovery rates of the phosphates added into the calcareous soils by specific extractants is at the range of 85–99%.
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