Persulfate Test Kits
0-5.6 & 7-70 ppm as Na₂S₂O₈
Persulfate is a strong oxidizer that is commonly used for clarifying swimming pools and spas and for the destruction of a broad range of soil and groundwater contaminants. Sodium persulfate is frequently used for environmental applications.
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The Ferric Thiocyanate Method
Reference: D.F. Boltz and J.A. Howell, eds. Colorimetric Determination of Nonmetals, 2nd Ed., Vol. 8, p. 304 (1978).CHEMetrics’ persulfate test kit employs the ferric thiocyanate method. In an acidic solution, persulfate oxidizes ferrous iron. The resulting ferric ion reacts with ammonium thiocyanate to form ferric thiocyanate, a red-orange colored complex, in direct proportion to the persulfate concentration. Chlorine does not interfere with this chemistry. Ferric iron, hydrogen peroxide, and ozone will interfere. Results are expressed in ppm (mg/L) sodium persulfate (Na2S2O8).