Study on the Effect of Cu (II) and Zn (II) on the Accumulation of Pb (II) from Soil to the Biomass of Vegetable

Table 5

Concentration of lead in this metal-contaminated soil and in the biomass of carrot grown in this soil.

Entry	Lead content in soil^a	Lead content in the biomass of carrots^b
		Stems and leaves			Tubers
		Range	Average	SD	Range	Average	SD
21	Background	0.17 ÷ 0.19	0.18	0.01	0.98 ÷ 1.09	1.03	0.06
22	100	0.18 ÷ 0.22	0.20	0.02	1.23 ÷ 1.40	1.29	0.09
23	200	0.90 ÷ 1.03	0.96	0.07	2.14 ÷ 2.45	2.33	0.16
24	300	1.29 ÷ 1.49	1.37	0.11	2.65 ÷ 3.17	2.95	0.27
25	400	1.72 ÷ 2.04	1.90	0.17	3.73 ÷ 4.38	4.13	0.35
26	600	1.98 ÷ 2.31	2.15	0.17	4.84 ÷ 5.64	5.20	0.41
27	800	2.32 ÷ 2.71	2.48	0.20	5.05 ÷ 5.85	5.44	0.40
28	1000	2.58 ÷ 2.93	2.72	0.18	5.46 ÷ 6.08	5.86	0.34
29	1200	2.80 ÷ 3.20	2.98	0.20	5.47 ÷ 6.46	6.02	0.50
30	1500	2.76 ÷ 3.25	3.04	0.25	5.58 ÷ 6.52	6.07	0.47

a, mg/kg of dried soil; b, mg/kg of fresh vegetable.