Persulphate Test Kit

Visual Kit

Range MDL Method Type Kit Cat. No. Refill Cat. No.
0 - 5.6 & 7 - 70 ppm as Na2S2O8 0.35 ppm Ferric Thiocyanate CHEMets K-7870 R-7870

CHEMetrics offers test kits employing the well-known Ferric Thiocyanate reagent to deliver sensitivity and accuracy within two minutes or less. Based on CHEMetrics patented Self-Filling Reagent Ampoule technology. Premixed. Premeasured. Precise. Each kit contains 30 tests.

The Ferric Thiocyanate Method

CHEMetrics' persulphate test kit employs the ferric thiocyanate method. In an acidic solution, persulphate oxidises ferrous iron. The resulting ferric ion reacts with ammonium thiocyanate to form ferric thiocyanate, a red-orange colored complex, in direct proportion to the persulphate concentration. Chlorine does not interfere with this chemistry. Ferric iron, hydrogen peroxide, and ozone will interfere. Results are expressed in ppm (mg/l) sodium persulphate (Na2S2O8).

Boltz, D.F. and Howell, J.A., eds. Colorimetric Determination of Nonmetals, 2nd ed., Vol. 8, p. 304 (1978).


Persulphate is a strong oxidiser that is commonly used for clarifying swimming pools and spas and for the destruction of a broad range of soil and groundwater contaminants. Sodium persulphate is frequently used for environmental applications.

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