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

Table 1

Chemical properties of the soil used for the experiment.

Biosolid treatment	pH	Total concentration (mg kg^−1)
		Cd	Cr	Cu	Ni	Pb	Zn
Control	7.7	0.5	37	105	24	25	95
135 Mg ha^−1	6.9	11	243	188	88	120	559
1,080 Mg ha^−1	6.1	26	596	478	215	396	1466

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.
1 : 1 w/v ratio.