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ammonium NH4
1+
acetate C2H3O2
1-
carbonate CO3
2-
hydroxide OH
1-
nitrate NO3
1-
nitrite NO2
1-
phosphate PO4
1-
sulfate SO4
2-
sulfite SO3
2-
cyanide CN
1-
permanganate MnO4
1-
chromate CrO2
2-