Table 3.

Heavy metals detected in bottom ash.

Heavy metals	N = items (30 samples)	Mean conc. of metal (mg/kg)	Std. deviation	USEPA allowable limits for waste disposal to landfill
Hg mg/kg	30	0.88	±0.05	0.2
Pb mg/kg	30	143.80	±39.5	5.0
Zn mg/kg	30	16417.69	±195.18	∗NA
Ag mg/kg	30	28.38	±0.97	5.0
Cr mg/kg	30	99.30	±3.0	5.0
Cd mg/kg	30	7.54	±2.67	1.0

^∗NA: not available.