Make 5 ml of solution S1 alkaline, if necessary, by the addition of a measured volume of dilute sodium hydroxide solution and dilute to 15 ml with water. To the solution, add 0,3 ml of alkaline potassium tetraiodomercurate solution. Prepare a reference solution by adding to 10 ml of a standard ammonium solution (containing 1 mg/l NH3) the same volume of dilute sodium hydroxide solution as for solution S1,
diluting to 15 ml with water and adding 0,3 ml of alkaline potassium tetraiodomercurate solution。Place the solutions in test tubes and stopper the tubes.
After 30 s, any yellow colour in the test solution shall not be more intense than that in the reference solution, which corresponds to 2 mg/l NH3 in solution S1.
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