App-standard ferrous gluconate stock (10 g/L)
iron
Fe(C6H11O7)2·2H2O
Partly derived
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What one dose does
PARAMETER
1 ml / 100 L
Iron
+11.583 ppb
To raise iron by 1 ppb in 100 L: 0.086 ml.
How it’s used
10 g/L x 0.1158 = 1158 mg/L Fe; 1 ml in 100 L = 11.58 ug/L.
Cautions
• Natural seawater Fe ~0.003-0.01 mg/L (Seachem); macroalgae-refugium dosing commonly targets 0.05-0.1 mg/L peaks. Iron fuels nuisance algae - start low.
• Iron is removed quickly (algae, skimming, oxidation); dose small amounts frequently rather than large boluses.
• Ferrous iron oxidizes in stock solutions; make small batches, keep refrigerated and dark.
Sources
10 g made up to 1 L total.
derived (app standard)