DS DS/EN 15921
DS DSEN 15921 2011-JUL-07 Fertlzers - Extracton of soluble phosphorus accordng to Petermann at 65 °C
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This document specifies the procedure for the determination of soluble phosphorus in alkaline ammonium citrate. The method is applicable exclusively to precipitated dehydrated dicalcium phosphate (CaHPO4 . 2H2O).