DD CEN/TS 15961:2009 Fertilizers. Extraction of phosphorus which is soluble in neutral ammonium citrate
DD CEN/TS 15961 specifies a method for the extraction of water-soluble calcium, magnesium, sodium and sulfur (in the form of sulfates), so that the same extract may be used for the determination of each nutrient required.
The method specified in DD CEN/TS 15961 is solely applicable to fertilizers listed in Regulation (EC) 2003/2003, Annex I (see [1]), for which a declaration of the water-soluble calcium, magnesium, sodium, and sulfur (in the form of sulfates) is provided for in this Regulation.
Contents of DD CEN/TS 15961:
Foreword 1 Scope 2 Normative references 3 Terms and definitions 4 Principle 5 Sampling 6 Reagents 7 Apparatus 8 Procedure 9 Test report Bibliography