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0.12
Olivier
0.10
a1
Initial P (m
M
)
0.08
3.2
0.06
1.3
0.04
0.02
0.32
0
0.00
0.12
a2
0.10
Sharkey
0.08
0.06
Initial P (m
M
)
3.2
0.04
0.02
1.3
0.32
0.00
0.12
Windsor
a3
0.10
0.08
0.06
Initial P (m
M
)
3.2
0.04
0.02
1.3
0.32
0.00
0
100
200
300
400
500
600
Reaction Time (h)
FIGURE 7.29
Arsenate concentrations in solution versus time in the presence of various concentrations of
phosphate. The initial concentration of As(V) was 0.13 mM.
As(V) and P (Zhao and Stanforth, 2001; Pigna, Krishnamurti, and Violante,
2006; Jia et al., 2006). The development of surface precipitate is a slow pro-
cess involving multiple reaction steps and explains in part the slow As(V)
and P retention kinetics. The theory of surface precipitation suggests that
anions absorbed on mineral surfaces attract dissolved Fe or Al. Adsorbed
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