Table 2.

Total and water-extractable concentrations of heavy metals (mg kg⁻¹)

Sample	Cd		Cu		Zn		Pb
	Total	W-E	Total	W-E	Total	W-E	Total	W-E
R250	86.24	7.47	131.23	6.12	8109.85	248.62	695.96	5.73
NR250	111.11	6.41	158.95	4.24	10,147.60	234.24	1104.50	9.50
R450	45.12	4.78	74.25	4.21	5487.32	196.48	527.40	6.39
NR450	42.14	3.54	90.11	2.84	6003.50	164.55	917.90	7.36

W-E water-extractable