BS EN 15476 is a standard that serves technical specifications for the determination of nitric and ammoniacal nitrogen in fertilizers, which enables the lowering of growing medium pH for optimum plant growth.
BS EN 15476 specifies a method for the determination of nitrate and ammoniacal nitrogen with reduction using Devarda alloy (modified for each of the variants a, b and c).
BS EN 15476 method is applicable to all nitrogenous fertilizers, including compound fertilizers, in which nitrogen is found exclusively in nitrate form or in ammoniacal and nitrate form.
BS EN 15476 on the determination of nitric and ammoniacal nitrogen in fertilizers applies to:
Devarda's alloy is an aluminium, copper, and zinc alloy. In fertilizer analysis, Devarda's alloy is used as a reducing agent to determine nitrates after they have been reduced to ammonia under alkaline circumstances.
BS EN 15476 provides users guidance on a method for the determination of nitrate and ammoniacal nitrogen with reduction using Devarda alloy. BS EN 15476 also provides users with a step-by-step procedure for the method, enabling users to do the method correctly.
BS EN 15476 provides users guidance on principle, reagents, apparatus, sampling, sample preparation, procedure, calculation, expression of results, precision, and test report, enabling the accurate determination of nitric and ammoniacal nitrogen in fertilizers.
With obedience and compliance of BS EN 15476, users can develop and assess the content of nitric and ammoniacal nitrogen that increase the nitrogen use efficiency (NUE) in plants.
BS EN 15476:2009 supersedes DD CEN/TS 15476:2006, which is now withdrawn.
EN 15476:2009