BS EN 17411:2020 pdf free.Fertilizers - Determination of perchlorate in mineral fertilizers by liquid chromatography and tandem mass spectrometry detection (LC-MS/MS>. BS EN 17411 This document specifies a method for the determination of traces of perchlorate by liquid chromatography and tandem mass spectrometry detection (LC-MS/MS>. The method is applicable to mineral fertilizers.The following documents are referred to in the text...