Dissolution of Metals from Biosolid-Treated Soils by Organic Acid Mixtures

Table 6

Metals release kinetics of biosolid-treated Romona soil (1,080 Mg ha⁻¹) in different concentrations of organic acid (OA) mixtures.

Element	OA concentration	Metal concentration (mg kg^−1)
		15 min	30 min	1 hr	2 hrs	4 hrs	8 hrs	24 hrs	48 hrs
Cd	0.001 M	0.31	0.32	0.33	0.35	0.37	0.40	0.46	0.47
	0.01 M	1.16	1.21	1.24	1.28	1.35	1.49	1.73	1.75
	0.1 M	1.67	1.70	1.75	1.82	1.90	2.03	2.40	2.48
Cr	0.001 M	0.34	0.40	0.44	0.49	0.57	0.73	1.09	1.12
	0.01 M	0.85	0.95	1.03	1.16	1.39	1.67	2.49	2.57
	0.1 M	1.46	1.78	1.91	2.17	2.53	3.17	4.79	5.04
Cu	0.001 M	2.41	2.48	2.63	2.78	2.88	3.14	3.81	3.89
	0.01 M	10.7	11.1	11.7	12.1	12.8	13.8	16.8	17.5
	0.1 M	20.3	21.2	22.5	23.7	25.2	26.4	32.1	33.4
Ni	0.001 M	2.53	2.64	2.83	2.94	3.13	3.28	3.72	3.79
	0.01 M	9.80	10.2	10.9	11.4	12.1	12.5	14.5	14.8
	0.1 M	16.1	16.8	18.0	18.8	19.5	20.8	23.3	24.1
Pb	0.001 M	0.13	0.14	0.15	0.18	0.22	0.29	0.42	0.46
	0.01 M	0.34	0.36	0.38	0.45	0.54	0.67	0.99	1.03
	0.1 M	0.77	0.82	0.87	1.02	1.09	1.89	2.01	2.33
Zn	0.001 M	25	26	28	29	31	32	36	38
	0.01 M	104	108	111	115	123	129	145	148
	0.1 M	205	211	220	227	235	245	275	282