A simple to use colorimetric test kit for the determination of Ferrous Iron in water. The detection limit of the kit is 0 – 10 mg/Liter. The kit is supplied with enough reagent powder pillows to perform 25 tests. Extra reagent powder pillows may be purchased in advance, if necessary.

The 1,10 phenanthroline indicator in the Ferrous Iron Reagent reacts with ferrous iron in the sample to form an orange color in proportion to the ferrous iron concentration. Ferric iron does not react. The ferric iron (Fe3+) concentration can be determined by subtracting the ferrous iron concentration from the results of a total iron test.