Table 10: Kinetics constant for metal dissolution reaction extracted by organic acid (OA) mixtures according to (1) and (2).

Biosolid treatment (Mg ha−1)Metal extracted by OAsZero- and first-order kinetics constant
CdCrCuNiPbZn

Control0.001 M 0.010.110.040.090.430.090.240.12n.d.n.d.1.20.12
0.01 M 0.030.100.060.091.400.091.560.14n.d.n.d.7.80.13
0.1 M 0.080.120.440.087.880.074.280.120.060.0921.20.13

135 0.001 M 0.220.090.280.093.440.092.120.120.840.0915.80.11
0.01 M 0.720.120.920.088.840.096.280.120.240.0985.60.13
0.1 M 3.160.133.640.0930.40.0826.80.141.280.084000.13

1,080 0.001 M 1.240.101.360.099.640.0810.10.140.520.081000.12
0.01 M 4.640.103.400.0842.80.0739.20.121.360.084160.12
0.1 M 6.680.075.840.0881.20.0864.40.123.080.088200.10

Values represent means of two replicates. The differences of first-order kinetics constant for Cd among the treatments were tested by one-way ANOVA. In each column, values followed by the same lowercase letter were not significantly different at .
Obtained at Moreno Field Station of the University of California, Riverside, CA. From 1976 through 1981, composted biosolids were applied at dry weight rates of 0 (control), 22.5, and 180 Mg ha−1 yr−1, respectively.
Concentration was below detection limits of the AAS for Pb = 0.001 mg kg−1.