Phytoextraction of Cu, Zn, and Pb Enhanced by Chelators with Vetiver (Vetiveria zizanioides): Hydroponic and Pot Experiments

Table 2

Soil properties and background metal concentrations.

	Soil value
pH (H2O)	6.58±0.44
Organic matter (%)	3.43±0.13
Clay (%) <2 μm	12.10
Silt (%) 2–50 μm	82.20
Sand (%) 50–2000 μm	5.70
Background Cu concentration (mg/kg)	23.26±4.72
Background Zn concentration (mg/kg)	121.55±6.34
Background Pb concentration (mg/kg)	76.55±12.68