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| The phosphor compounds present in the water are converted into orthophosphates by means of destruction with potassium persulphate sulphuric acid. Ammonium molybdate in an acid environment with orthophosphate ions, antimony oxyions and ascorbic acid will form a blue coloured compound. The intensity of the blue colour is measured at 880 nm and is a measure for the phosphate content in question. |
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| Matrices qualified by the Dutch RvA: | Wastewater, Drinking water, Groundwater, Surface water |
| Reporting limit: | 0.03 mg P/l, matrix dependent |
| Measurement uncertainty: | 20% |
| Sustainability: | 28 days
, if conserved with H2SO4
|
| Sampling bottle: | Glass
, brown
, 100 ml
, conservation with H2SO4
(fill up to the neck of the bottle)
|
