Active Biosources of Phosphorus

Animal bones, which were recognised as a source of phosphorus at an early date, are still used after conversion to bone meal by grinding, or to bone ash by calcining. Such products are rich in 

Average Contents of Typical Phosphate Sources (wt% P2O5) 

Kola (igneous) 40 West USA (phosphoria) 18-30 Bone meal 20 

FIGURE 2.2 Major phosphate deposits in the United States. 

FIGURE 2.4 Major phosphate deposits in (a) South America and (b) Africa. O = igneous = sedimentary. 

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