Table 4. Heavy metal content of fecal sludge ash samples (samples n=2 for each category) in mg/kg dry mass.

Average ± st. dev. is reported.

Parameter (mg/kg)	Coimbatore	Tiruppur Pilot	Tiruppur Community	Tiruppur Industrial	Tiruppur-Multi	Tiruppur Single
Ba	108.5 ± 9.2	191.0 ± 17.0	>1000	140.5 ± 4.9	150.5 ± 10.6	160.0 ± 7.1
Se	<10	<10	<10	<10	<10	<10
Ag	<10	<10	<10	<10	<10	<10
As	<10	<10	<10	<10	<10	<10
Cd	<10	<10	<10	<10	<10	<10
Cr	22.0 ± 9.9	60.0 ± 70.7	79.0 ± 9.9	<10	<10	<10
Pb	10.0 ± 1.4	10.5 ± 0.7	21.0 ± 2.8	<10	<10	<10
Hg	<10	<10	<0.5	<0.5	<0.5	<0.5