Table 5.

The heavy metal leaching concentration of mixed ashes (mg/l).

	Mixed ash-P1		Mixed ash-P2
	Before concrete production	After concrete production	Before concrete production	After concrete production
Cr	538.2	4.8	455	3.7
Cu	3221.2	125.6	2692.5	82.4
Ni	34.9	3.4	16.5	3.2
Pb	859.3	2.4	885.1	2.2
Zn	821.9	97.8	885.2	91.9
Cd	86.7	0.76	116.87	0.84
Hg	0.0108	0.00002	0.0332	0.00061
As	0.0171	0.00034	0.0061	0.0002