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

Table 4

Estimated solution concentrations (16-week average) of organic acid mixtures in root exudates of corn.

Treatment	Estimated concentration (mM)
	Standard (control)		Biosolid-treated
	Mean	SD	Mean	SD
Blank	2.05	0.63	3.41	0.87
Planted	5.23	1.21	12.9	2.04

All experiments performed in four replicates for each 2, 4, 8, 12, and 16 weeks. Values represent means and standard deviation of 20 replicates.