DS DS/EN 15558
DS DSEN 15558 2009-FEB-16 Fertlzers - Determnaton of ntrc and ammonacal ntrogen accordng to Ulsch
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This European Standard specifies a method for the determination of nitrate and ammoniacal nitrogen with reduction according to Ulsch. The 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.