Randy Holmes-Farley
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You need to raise sulfur (S) by that amount, right, not sulfate (SO4--). Sulfate needs a much bigger rise since you count the weight of the oxygen atoms on it. Sodium sulfate is 67.6% sulfate by weight (make certain it is sodium sulfate (Na2SO4) and not sodium bisulfate (NaHSO4), which will wipe out your alkalinity).
Sulfate weighs 3 times as much as sulfur, so a 377 ppm rise in sulfur means a 1129 ppm rise in sulfate.
1129 mg/L * 0.676 = 1,670 mg/L sodium sulfate needed, or 1.67 g/L.
Note that will boost salinity a LOT! From 35 ppt to 36.7 ppt.
Sulfate weighs 3 times as much as sulfur, so a 377 ppm rise in sulfur means a 1129 ppm rise in sulfate.
1129 mg/L * 0.676 = 1,670 mg/L sodium sulfate needed, or 1.67 g/L.
Note that will boost salinity a LOT! From 35 ppt to 36.7 ppt.