WLN-CA.W.20.3	Determination of ammonium in water by means of the discrete analyser	in accordance with NEN-EN-ISO 15923-1
Principle:	In presence of sodium nitroprusside as catalyst, the ammonium with hypochlorite ions and salicylate at pH 12.6 will form a blue/green coloured indol compound. The hypochlorite ions are formed in situ by alkaline hydrolysis of sodium dichloroiso cyanurate. The extinction at 660 nm is a measure for the ammonium content. Sodium citrate is used to mask interfering cations.
Determination:	Ammonium (mg N)
Performance characteristics:
Matrices qualified by the Dutch RvA:	Drinking water, Groundwater, Surface water
Reporting limit:	0.02 mg N/l, matrix dependent
Measurement uncertainty:	15%
Sustainability:	21 days , if conserved with H2SO4
Sampling bottle:	Glass , brown , 100 ml , conservation with H2SO4 (fill up to the neck of the bottle)

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