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Ammonium
(NH4)+
Carbonate
(CO3)2-
Cyanide
(CN)-
Hydroxide
(OH)-
Nitrate
(NO3)-
Nitrite
(NO2)-
Phosphate
(PO4)3-
Phosphite
(PO3)3-
Sulfate
(SO4)2-
Sulfite
(SO3)2-