DIN EN 16075:2012
肥料.尿素及含尿素化肥N-(2-硝基苯基)磷酸三胺的测定(2-NPT).使用高效液体色析法(HPLC).德文版 EN ISO 16075-2011
Fertilizers - Determination of N-(2-nitrophenyl)phosphoric triamide (2-NPT) in urea and fertilizers containing urea - Method using high-performance liquid chromatographie (HPLC); German version EN 16075:2011