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

Table 3

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

Entry	Lead content in soil^a	Lead content the biomass of spinach^b
		Stems and leaves			Roots
		Range	Average	SD	Range	Average	SD
1	Background	0.29 ÷ 0.34	0.03	0.03	0.53 ÷ 0.63	0.57	0.05
2	100	0.48 ÷ 0.55	0.51	0.04	0.94 ÷ 1.09	1.02	0.08
3	200	0.58 ÷ 0.67	0.63	0.05	1.06 ÷ 1.21	1.11	0.08
4	300	0.81 ÷ 0.94	0.89	0.07	1.67 ÷ 1.96	1.79	0.15
5	400	1.11 ÷ 1.26	1.19	0.08	2.63 ÷ 2.97	2.75	0.19
6	600	1.22 ÷ 1.42	1.31	0.10	2.65 ÷ 3.00	2.77	0.20
7	800	1.70 ÷ 1.93	1.79	0.12	3.72 ÷ 4.13	3.98	0.23
8	1000	1.80 ÷ 2.11	1.98	0.16	4.73 ÷ 5.46	4.97	0.42
9	1200	2.01 ÷ 2.33	2.16	0.16	4.87 ÷ 5.62	5.14	0.42
10	1500	2.12 ÷ 2.49	2.29	0.19	5.05 ÷ 5.79	5.52	0.41

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