AbstractFor a prolonged time a photometric method of analysis for determining the urea content in waters was tested by the author. With this method, the urea component of the water sample is hydrolysed into ammonium‐ions and photometered by the use of a new indophenol‐blue technique (selected methods of water analysis. 1985) with the Spekol at 546 nm. The ammonium content of the untreated water sample should be taken into account in the explanatory method of calculation of the urea content. If the state of the water sample is unchanged, urea concentrations of up to about 60 mg/I can be determined. The detection limit is at 0.15… 0.20
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