Has anybody prepared Fe-EDTA?
Hello everyone. I some question about Fe-EDTA. I've prepared a solution of Fe-EDTA mixing two solutions:
1 - Disodium EDTA with sodium hydroxide
2 - Ferrous sulphate (with some sulfuric acid to dissolve completely the ferrous sulphate)
After mixing, the pH was adjusted to pH = 5.5
The result was a pale yellow solution.
After three days the solution changed its color to orange.
So, my question is: Why the color of the solution changed?
Is OK to use this solution in hydroponics?