Environmental Engineering Reference
In-Depth Information
TABLE 21.3
Possible.Reactions.of.Adsorption.of.As(III).and.As(V).by.Ferrihydrite
Fe OH
−
]
+
1 2
/
+
H AsO
0
→ −
Fe OAs OH
(
) ]
−
1 2
/
As.(III).at.pH.4.6
2
3
3
2
Fe OH
−
]
+
1 2
/
+
H AsO
0
→ −
Fe O H As OH
(
)
(
) ]
+
1 2
/
2
3
3
2
Fe OH
−
]
−
1 2
+
H AsO
0
→ −
Fe OAs OH
(
) ]
−
1 2
/
3
3
2
Fe OH
−
]
−
1 2
/
+
H AsO
0
→ −
Fe O H As OH
(
)
(
) ]
+
1 2
/
3
2
Fe OH
|(
) ]
+
1
+
H AsO
0
→
Fe O H AsOH
|
(
)
]
+
1
2 2
3
3
2
2
Fe OH
|(
) ]
+
1
+
H AsO
0
→
Fe O H AsOH
|
(
)
]
0
2 2
3
3
2
Fe OH
|(
) ]
+
1
+
H AsO
0
→
Fe O AsOH
|
]
−
1
2 2
3
3
2
Fe OH OH
|(
)(
)]
0
+
H AsO
0
→
Fe O H AsOH
|
(
)
]
+
1
2
3
3
2
2
Fe OH OH
|(
)(
)]
0
+
H AsO
0
→
Fe O H AsOH
|
(
)
]
0
2
3
3
2
Fe OH OH
|(
)(
)]
0
+
H AsO
0
→
Fe O AsOH
|
]
−
1
2
3
3
2
Fe OH
|(
) ]
−
1
+
H AsO
0
→
Fe O H AsOH
|
(
)
]
+
1
2
3
3
2
2
Fe OH
|(
) ]
−
1
+
H AsO
0
→
Fe O H AsOH
|
(
)
]
0
2
3
3
2
Fe OH
|(
) ]
−
1
+
H AsO
0
→
Fe O AsOH
|
]
−
1
2
3
3
2
Fe OH
−
]
−
1 2
/
+
H AsO H AsO
−
+
0
→ −
Fe OAs OH
(
) ]
−
1 2
/
As.(III).at.pH.9.2
2
3
3
3
2
Fe OH
−
]
−
1 2
/
+
H AsO H AsO
−
+
0
→ −
Fe OAs O OH
(
)(
)]
−
3 2
/
2
3
3
3
Fe OH
|(
) ]
−
1
+
H AsO H AsO
−
+
0
→
Fe O H AsOH
|
(
)
]
0
2
2
3
3
3
2
Fe OH
|(
) ]
−
1
+
H AsO H AsO
−
+
0
→
Fe O AsOH
|
]
−
1
2
2
3
3
3
2
Fe OH
−
]
+
1 2
/
+
H AsO
−
→ −
Fe OAs O OH
(
)(
) ]
−
1 2
/
As.(V).at.pH.4.6
2
2
4
2
Fe OH
−
]
+
1 2
/
+
H AsO
−
→ −
Fe OAs O OH
(
) (
)]
−
3 2
/
2
2
4
2
Fe OH
−
]
−
1 2
/
+
H AsO
−
→ −
Fe OAs O OH
(
)(
) ]
−
1 2
/
2
4
2
Fe OH
−
]
−
1 2
+
H AsO
−
→ −
Fe OAs O OH
(
) (
)]
−
3 2
/
2
4
2
Fe OH
|(
) ]
+
1
+
H AsO
−
→
Fe O As OH
|
(
) ]
0
2 2
2
4
2
2
Fe OH
|(
) ]
+
1
+
H AsO
−
→
Fe O As O OH
|
(
)(
)]
−
1
2 2
2
4
2
Fe OH OH
|(
)(
)]
0
+
H AsO
−
→
Fe O As OH
|
(
) ]
0
2
2
4
2
2
Fe OH OH
|(
)(
)]
0
+
H AsO
−
→
Fe O As O OH
|
(
)(
)]
−
1
2
2
4
2
(continued)
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