Table 1

Solids characterization using hot HCl extraction, XRD and XANES for all experiments at 0 day (initial), 21 days and 63 days (n.d.: no data).

AD1
 CP1
 AD5
 CP5
Synthesis mechanism
 Adsorption
 Co-precipitation
 Adsorption
 Co-precipitation
Initial
solid As (mM)1
 0.17
 0.17
 0.84
 0.84
Initial
solid Fe (mM)1
 3.06
 3.06
 15.3
 15.3
Initial
molar solid As/Fe (%)1
 5.48
 5.48
 5.55
 5.55
Initial
solid As(III)/As (%)2
 < 5
 < 5
 < 5
 < 5
After 21 days
solid As(III)/As (%)2
 9
 8
 n.d.
 n.d.
After 63 days
solid As(III)/As (%)2
 16
 n.d.
 29
 n.d.
Initial
solid composition3
 2LFh
 2LFh
 2LFh
 2LFh
After 21 days
solid composition3
 2LFh
 2LFh
 2LFh
 2LFh
After 63 days
solid composition3
 2LFh, Vivianite, Bobierrite
 2LFh, Vivianite
 2LFh
 2LFh

1 From hot HCl extraction.

2 From XANES (accuracy on the molar As(III)/As ratio is ± 3%).

3 From XRD.

Burnol et al. Geochemical Transactions 2007 8:12   doi:10.1186/1467-4866-8-12