Table 11: Amounts of metals that were extractable from the biosolid-treated Romona soil (1,080 Mg ha−1) by 0.1 M organic acid mixture.

ElementRapid release (mg kg−1)Slow release (mg kg−1)Total release (mg kg−1)

Cd1.670.862.53
Cr1.463.745.20
Cu20.313.734.0
Ni16.18.6024.7
Pb0.771.732.50
Zn20580.0285