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

Table 3

Heavy metal decreasing concentration and the removal efficiency in hydroponic experiments. unit: mg/L.

Treatment condition				Operation time (day)					Removal efficiency (%)
	0	1	2	3	4	5	6	7
Cu	4.58	2.47	2.97	2.58	2.60	1.85	2.38	2.90	36.70
Cu+EDDS	5.63	5.12	5.40	—	—	—	—	—	9.10
Cu+CA	5.58	2.05	4.07	4.07	4.48	3.60	4.03	3.73	33.2
Cu+EDTA	5.32	2.95	5.10	—	—	—	—	—	4.10
Zn	4.52	4.12	4.43	3.83	—	—	—	—	15.3
Zn+EDDS	5.10	5.28	5.6	4.75	—	—	—	—	6.90
Zn+CA	5.25	4.85	5.5	4.5	—	—	—	—	14.3
Zn+EDTA	4.53	4.37	—	4.38	—	—	—	—	3.30
Pb	5.65	2.89	2.59	2.56	1.73	1.59	1.91	1.53	72.9
Pb+EDDS	5.69	5.15	5.39	5.05	3.14	4.8	4.51	2.44	57.1
Pb+CA	5.42	3.83	3.66	2.79	3.27	3.29	3.04	1.58	70.9
Pb+EDTA	5.51	4.83	5.30	4.59	5.56	6.28	6.23	5.13	6.90