Chemical Speciation and Potential Mobility of Heavy Metals in Organic Matter Amended Soil

Table 1

Characteristics of the soils and OM used in the experiment.

Parameter	Sampling point 1	Sampling point 2	Sampling point 3	OM
Moisture (%)	19.70	34.78	36.72	—
Texture	Silt loam	Silty clay loam	Silty clay	—
Sand%	3.17	7.69	1.23	—
Silt%	70.69	58.35	57.11	—
Clay%	26.14	33.96	41.66	—
pH	6.55	7.53	8.01	8.84
Organic carbon (%)	0.79	1.02	0.86	16.3
OM (%)	1.36	1.76	1.50	28.04
Total nitrogen (%)	0.08	0.10	0.09	1.60
C/N ratio	9.88	10.2	9.56	14.7
CEC (meq/100 g soil)	5.61	12.16	17.77	—
Total phosphorus (%)	0.05	0.04	0.04	0.79
Free carbonate (%)	2.31	2.59	2.72	—
Total Pb (mg/kg)	20.75	25.40	26.38	1
Total Cd (mg/kg)	0.28	0.21	0.38	BDL

BDL = below detection limit.