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Abstract Apatite inclusions have been identified in several primary minerals, and their abundance and morphology have been described. A comparison of several methods used for the determination of total P in soils showed that Na 2 CO 3 fusion is the most reliable method for samples which contain apatite inclusions and that the effectiveness of extraction was usually in the order: Na 2 CO 3 fusion > HF digestion > HClO 4 digestion > N H 2 SO 4 extraction following ignition. Included apatite was identified using a petrological microscope in residues after digestion with 60% HClO 4 . This form was also extracted much more slowly by 0.5 N HCl than was nonincluded apatite. Included apatite resistant to attack by 1 N HCl was determined as “residual inorganic P” in fractionation studies on weakly weathered materials, and the influence of fineness of grinding on the ratio of “acid‐extractable Ca‐P” to residual inorganic P indicated the likely dimensions of the inclusions in different minerals.
Syers et al. (Wed,) studied this question.