Fertilizers. Determination of nitric and ammoniacal nitrogen according to UlschBS EN 15558: 2009 Fertilizers. Determination of nitric and ammoniacal nitrogen according to Ulsch BS EN 15558 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. Contents of BS EN 15558: Foreword Scope Normative

ASTM A194/A 194M:1998

Procedures for aggregation of utility-based quality scores

• Porosity

It specifies requirements for products

The standard also looks at how to clean apparatus and draw up an accurate test report

pre- and post-braze treatment and inspection

BS EN 62388:2008 specifies the minimum operational and performance requirements

This European Standard is a revision of BS 7511:1989

The Essential Guide to Technical Product Specification: Engineering Drawing

The percentage of voids is calculated from the loose bulk density and the particle density

Download our parents' guide to toy safety (BS EN 71 series)

Measuring equipment