Polarographic determination of nitrite in waters, meat and sausage products

Nitrite can be determined polarographically after its conversion to diphenylnitrosamine (C₆H₅)₂NNO. Potassium thiocyanate is used as a catalyst in order for the conversion to proceed rapidly and quantitatively. The reaction takes place in acid solution at a pH value of approx. 1.5. The limit of quantification is 5 μg/L NO₂^-.

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