This second edition cancels and replaces the first edition (i.e. ISO 2599:1973). Specifies a method using hexaammonium heptamolybdate (ammonium molybdate). The method is applicable to a concentration range of 0,10 to 5,0 % (m/m) of phosphorus in natural iron ores, and iron ore concentrates and agglomerates, including sinter products. Describes principle, reagents, apparatus, sampling and samples, procedure, expression of results and test report.