Sulfite SO3
Sulfate SO4
Both contain sulfur and oxygen, the ending number gives the oxygen, one will make SO2 gas in water the other will not, the SO2gas what precipitates the gold from solution.
Sulfates can be used like sulfuric acid is.
Na2S2O5 sodium metabisulfite, some other names or similar chemical
bonide stump out, sodium sulfite, potato white,sodium pyrosulfite.
http://en.wikipedia.org/wiki/Sodium_metabisulfite
http://en.wikipedia.org/wiki/Sodium_bisulfate
Ferrous sulfate will work very well to precipitate gold and can be made using soft iron laminates from old transformers (burn off shellac) cut in pieces dissolve in 10% heated sulfuric acid, can evaporate down to green crystals store in wet acidic condition to keep them green and from oxidizing to brown.
Pay close attention to the ending in chemical names.