Arsenic Mobility in As-Containing Soils from Geogenic Origin: Fractionation and Leachability
Table 2
As leachability in TCLP and the effect of pH, solid : liquid ratio, phosphorous, and time on As mobilization.
Sample
(mg kg−1)
TCLP
Effect of S : L ratio
Effect of pH
Effect of P and time
(mg kg−1)
(mg kg−1)
As1:50 (mg kg−1)
(mg kg−1)
(mg kg−1)
(mg kg−1)
(mg kg−1)
(mg kg−1)
1
329.61
0.84 (0.25%)
(0.03%)
(0.33%)
(0.04%)
(0.11%)
(0.22%)
(3.19%)
(5.17%)
2
347.53
0.03 (0.007%)
(0.005%)
(0.15%)
(0.003%)
(0.03%)
(0.19%)
(3.16%)
(4.67%)
3
168.04
0.02 (0.01%)
(0.02%)
(0.16%)
(0.006%)
(0.07%)
(0.23%)
(2.16%)
(5.05%)
4
157.68
0.03 (0.02%)
(0.03%)
(0.32%)
(0.01%)
(0.07%)
(0.24%)
(2.88%)
(4.77%)
5
338.24
0.03 (0.009%)
(0.004%)
(0.06%)
(0.003%)
(0.03%)
(0.18%)
(2.40%)
(4.24%)
6
381.30
0.03 (0.009%)
(0.002%)
(0.03%)
(0.003%)
(0.02%)
(0.25%)
(2.26%)
(3.51%)
7
393.47
0.02 (0.005%)
(0.003%)
(0.02%)
(0.003%)
(0.02%)
(0.13%)
(2.09%)
(3.65%)
8
126.21
0.02 (0.02%)
(0.006%)
(0.05%)
(0.01%)
(0.14%)
(0.71%)
(2.97%)
(2.64%)
9
91.96
0.01 (0.006%)
3.7 (0.004%)
(0.05%)
8 (0.001%)
(0.01%)
(0.06%)
(2.16%)
(2.23%)
Pseudo-total As content determined by microwave digestion used for the calculation of the percentages of As extracted; As extracted using DIN 38414-S4 [38];superscript letters indicate significant differences between the tested experimental conditions for each parameter; figures in parentheses indicate the percentage of As mobilized with respect to the pseudo-total As concentrations.
