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0.30
Olivier
b1
0.25
Initial As(V) (m
M
)
1.3
0.20
0.15
0.10
0.13
0.05
0
0.00
0.18
Sharkey
b2
Initial As(V) (m
M
)
0.15
1.3
0.12
0.09
0.06
0.03
0.13
0
0.00
0.10
Windsor
b3
0.08
0.06
Initial As(V) (m
M
)
0.04
1.3
0.02
0.13
0
0.00
0
100
200
300
400
500
600
Reaction Time (h)
FIGURE 7.30
Phosphate concentrations in solution with time in the presence of various concentrations of
arsenate. The initial concentration of P was 0.32 mM.
Fe or Al in turn adsorbs more anions and results in a multilayer adsorption.
Zhao and Stanforth (2001) suggested the slow buildup of surface precipi-
tate as the mechanisms of irreversible As(V) and P retention on goethite.
More recently, the x-ray diffraction and Raman spectroscopy results of Jia et
al. (2006) confirmed the formation of poorly crystalline ferric As(V) surface
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