Field Application of the Stabilization Process for Arsenic-Contaminated Soil - Environmental Contamination: Health Risks and Ecological Restoration - page 466

The.resulting.stabilization.using.the.synthesized.magnetite.(iron/mine.
tailings. ratio. of. 0.335%. and. 0.670%). for. 28. days. is. shown. in. Figure. 21.6..
Figure.21.6a.indicates.that.the.arsenic.concentrations.in.the.mine.tailings.
leached.by.pH.5.8.DI.water.were.signiicantly.reduced..After.1.day.of.sta-
bilization,. more. than. 90%. of. the. As. was. stabilized. for. both. 0.335%. and.
0.670%.iron/mine.tailings.ratios.and.was.stable.after.28.days..The.differ-
ence.in.the.arsenic.treatment.eficiencies.with.different.iron/mine.tailings.

10

Control
0.335%
0.67%

1

0.1

0.01

1 day 3 days 7 days

Time

14 days 28 days

(a)

1.6

Control
0.335%
0.67%

1.4

1.2

1.0

0.8

0.6

0.4

0.2

0.0

3 days 7 days

Time

14 days 28 days

1 day

(b)

FIGURE 21.6
As.concentrations.in.mine.tailings.for.28.days.of.stabilization.leached.by.(a).pH.5.8.DI.water.
and.(b).TCLP.solution.