Table 1.

The physicochemical characteristic of the study soil represented as mean ± standard deviation (n = 3).

pHH2O	5.95 ± 0.02
pHKCl	5.14 ± 0.04
CEC (cmol/kg)	9.08 ± 0.52
TOC (%)	2.15 ± 0.05
Particle size distribution (%)
Clay	Silt	Sand
7	31	62
Soil classification
Sandy loam

Total metal(loid) concentrations mg/kg (n = 3)
mg kg−1		Composted sludge	Fe grit
As	296 ± 60	< dl	< dl
Pb	3539 ± 37	28.3 ± 3.4	42.2 ± 8.8
Cd	39 ± 10	< dl	< dl
Zn	4002 ± 68	358 ± 10	1226 ± 86
Cu	68 ± 30	109 ± 2	1392 ± 59
Fe	37,408 ± 19	17,592 ± 414	817,888 ± 65,610
Mn	4276 ± 34	386 ± 3	7369 ± 477

< dl results lower than the detection limit of the ICP OES.