Fe-EDTA (A&A)
Na
2
EDTA•2H
2
O
866.7 mg
FeSO
4
•7H
2
O
or
Fe
2
(SO
4
)
3
•nH
2
O
2.28 mg
KOH
866.7 mg
Milli-Q Water
~100 mL
-Dissolve KOH in 31 mL Milli-Q
-Add Na
2
EDTA•2H
2
O
-In separate container, dissolve FeSO
4
•7H
2
O
or
Fe
2
(SO
4
)
3
•nH
2
O in 60.67 mL Milli-Q
-Mix both solutions together
-Bubble filtered air through combined solutions until the color darkens (~2.5 hr)