Table 12: The slope of metal extracted from the biosolid-treated Romona soil (1,080 Mg ha−1) by 0.1 M organic acid mixtures according to (3).

Element

Cd6.683.401.750.910.480.250.100.05
Cr5.843.561.911.090.630.400.200.11
Cu81.242.422.511.96.303.301.340.70
Ni64.433.618.09.404.882.600.970.50
Pb3.081.640.870.510.270.240.080.05
Zn82042222011358.830.611.55.88

Values of , , , , , , or indicate the slopes of metal extracted at 15 min., 30 min., 1 hr, 2 hrs., 4 hrs., 8 hrs., 24 hrs., and 48 hrs.