The document specifies the method for the extraction of phosphorus soluble in 2 % citric acid (20 g per litre).The method is applicable only to types of basic slag.
DIN SPEC 1099:2010 history
2011DIN EN 15920:2011 Fertilizers - Extraction of phosphorus soluble in 2 % citric acid; German version EN 15920:2011
2010DIN SPEC 1099:2010 Fertilizers - Extraction of phosphorus soluble in 2 % citric acid; German version CEN/TS 15920:2009