|
| The organic substance is destructed with a mixture of concentrated sulphuric acid and potassium sulphate with a catalyst. In this process organically bound nitrogen is converted into ammonia ions. Ammoniareacts with hypochlorite and salicylate in the presence of sodiumnitroprusside to a blue colored complex witch is measured colorimetricby a discrete analyzer at 660 nm. |
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| Matrices qualified by the Dutch RvA: | Wastewater, Drinking water, Surface water |
| Reporting limit: | 0.5 mg N/l, matrix dependent |
| Measurement uncertainty: | 25% |
| Sustainability: | 28 days
, if conserved with H2SO4
|
| Sampling bottle: | Glass
, brown
, 250 ml
, conservation with H2SO4
(fill up to the neck of the bottle)
|
