Table 8: Metals release kinetics of control Romona soil in different concentrations of organic acid (OA) mixtures.

ElementOA concentrationMetal concentration (mg kg−1)
15 min30 min1 hr2 hrs4 hrs8 hrs24 hrs48 hrs

Cd0.001 M0.00130.00140.00150.00150.00160.00170.0020.002
0.01 M0.00840.00880.00910.00970.01020.01150.01370.014
0.1 M0.0200.0210.0220.0230.0250.0270.0310.032

Cr0.001 M0.0100.0120.0130.0160.0190.0230.0340.035
0.01 M0.0150.0180.0200.0230.0280.0350.0520.053
0.1 M0.110.130.140.160.200.230.350.36

Cu0.001 M0.10710.11390.12070.12750.13430.14330.1700.177
0.01 M0.350.360.390.410.440.470.560.58
0.1 M1.972.032.122.212.342.513.113.17

Ni0.001 M0.06030.0630.06750.07020.07370.07730.08910.090
0.01 M0.390.420.470.480.510.530.630.64
0.1 M1.071.121.181.241.331.421.641.67

Pb0.001 Mn.d.n.d.n.d.n.d.n.d.n.d.n.d.n.d.
0.01 Mn.d.n.d.n.d.n.d.n.d.n.d.n.d.n.d.
0.1 M0.0140.0160.0170.0190.0240.0300.0420.044

Zn0.001 M0.300.320.340.350.370.380.440.45
0.01 M1.952.062.172.262.342.442.772.79
0.1 M5.35.66.06.26.56.87.87.9

Concentration was below detection limits of the AAS for Pb = 0.001 mg kg−1.