Originally Posted by kcoscia
I don't dose excel or anything normally but I may look into it. I'm also curious about the other method- asorbic acid and potassium sorbate. how much? how do you get it, etc
anywhere between 0.5 to 1 gram is fine for both when making 500ml solution, you can increase them if you are trying to make a highly consecrated solution. i made a DTPA Fe solution which stated fresh for one full year before finishing the bottle.