Journal of Chemistry

Research Article

Arsenic Mobility in As-Containing Soils from Geogenic Origin: Fractionation and Leachability

Table 3

Fe leachability in TCLP and the effect of pH, solid : liquid ratio, phosphorous, and time on Fe mobilization.


Sample	(%)	TCLP	Effect of S : L ratio		Effect of pH			Effect of P and time
Sample	(%)	(mg kg⁻¹)	Fe_1:10 (mg kg⁻¹)	Fe_1:50 (mg kg⁻¹)	(mg kg⁻¹)	(mg kg⁻¹)	(mg kg⁻¹)	(mg kg⁻¹)	(mg kg⁻¹)

1	2.90	1.73 (0.01%)	0.02 (<0.01%)	0.22 (<0.01%)	1.74 (0.01%)	0.07 (<0.01%)	0.56 (<0.01%)	0.10 (<0.01%)	0.20 (<0.01%)
2	4.97	0.40 (<0.01%)	0.01 (<0.01%)	1.67 (<0.01%)	3.96 (0.01%)	<d.l.	<d.l.	<0.01 (<0.01%)	0.02 (<0.01%)
3	6.19	0.77 (<0.01%)	0.85 (<0.01%)	0.43 (<0.01%)	8.34 (0.01%)	0.04 (<0.01%)	0.26 (<0.01%)	0.03 (<0.01%)	0.07 (<0.01%)
4	6.50	5.00 (0.01%)	1.01 (<0.01%)	0.54 (<0.01%)	5.67 (0.01%)	<d.l.	1.62 (<0.01%)	0.03 (<0.01%)	0.10 (<0.01%)
5	4.47	0.59 (<0.01%)	0.06 (<0.01%)	0.34 (<0.01%)	1.19 (<0.01%)	<d.l.	0.66 (<0.01%)	0.10 (<0.01%)	0.10 (<0.01%)
6	4.38	1.01 (<0.01%)	<0.01 (<0.01%)	0.12 (<0.01%)	2.79 (0.01%)	<d.l.	1.59 (<0.01%)	0.15 (<0.01%)	0.08 (<0.01%)
7	4.26	0.74 (<0.01%)	0.01 (<0.01%)	0.09 (<0.01%)	1.62 (<0.01%)	<d.l.	0.16 (<0.01%)	0.08 (<0.01%)	0.10 (<0.01%)
8	1.20	0.50 (<0.01%)	0.05 (<0.01%)	0.17 (<0.01%)	2.22 (0.02%)	<d.l.	1.63 (0.02%)	0.43 (<0.01%)	0.43 (<0.01%)
9	6.59	<d.l.	0.03 (<0.01%)	0.66 (<0.01%)	<d.l.	<d.l.	<d.l.	0.03 (<0.01%)	0.05 (<0.01%)

d.l.: detection limit of Fe in TCLP method equal to mg kg⁻¹; d.l.: detection limit of Fe in the study of pH effect equal to mg kg⁻¹; figures in parentheses indicate the percentage of Fe mobilized with respect to the pseudo-total Fe concentrations.