Evaluation of Phytoavailability of Heavy Metals to Chinese Cabbage (Brassica chinensis L.) in Rural Soils

Table 2

Single extraction procedures used.

Extraction method	Liquid : solid ratio	Equilibration time	Reference
Rhizon soil solution samplers	At field capacity	40-day incubation
Distilled water	5 : 1	16 h	Mench et al. [34]
0.1 M NaNO3	5 : 2	2 h	Gupta and Aten [35]
0.01 M CaCl2	10 : 1	3 h	Novozamsky et al. [9]
0.11 M HOAc	20 : 1	16 h	Ure et al. [36]
0.1 N HCl	10 : 1	1 h	Baker and Amacher [16]
0.05 M EDTA	10 : 1	1 h	Wear and Evans [37]
0.005 M DTPA, 0.01 M CaCl2, and 0.1 M TEA	2 : 1	2 h	Lindsay and Norvell [17]