•
NO
3
-
nitrate ion
•
NO
2
-
nitrite ion
•
PO
4
3-
phosphate ion
•
SO
4
2-
sulfate ion
•
HSO
4
-
hydrogen sulfate ion
•
SO
3
2-
sulfite ion
•
CH
3
COO
-
(C
2
H
3
O
2
-
)
acetate ion