This document specifies a method for the determination of the urease inhibitor
N-(n-butyl)thiophosphoric triamide (NBPT) and its oxidate form N-(n-butyl)phosphoric triamide (NBPTO) in urea based organo-mineral fertilizers, using the liquid chromatography coupled with triple quadrupole mass spectrometry (LC-MSQQQ).
This document is applicable to organo-mineral fertilizers.
NOTE It is possible to apply this method to inorganic fertilizers; in this case, a validation is carried out by a laboratory for the procedure and data generated.
NOTE: If the word "harmonized" (marked in green) is not found in the field with the name of the directive, it means that the European standard is not cited in the OJEU.
PROJECT
dnaSRPS EN 18317:2025
50.20
Proof sent to secretariat or FDIS ballot initiated: 8 weeks
Sep 24, 2026
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