Limits of Toxic Substances in Sewage
| ||
---|---|---|
Substance
|
Concentration
(parts per million)
|
Abbreviation
|
Arsenic
|
0.05
|
(as As)
|
Barium
|
1.0
|
(as Ba)
|
Boron
|
1.0
|
(as B)
|
Chromium (hexavalent)
|
0.25
|
(as Cr)
|
Copper
|
0.20
|
(as Cu)
|
Chlorine
|
20.0
|
(as Cl)
|
Cyanide
|
0.1
|
(as Cn)
|
Cadmium
|
0.1
|
(as Cd)
|
Iron
|
5.0
|
(as Fe)
|
Lead
|
0.05
|
(as Pb)
|
Manganese
|
1.0
|
(as Mn)
|
Mercury
|
0.005
|
(as Mg)
|
Nickel
|
1.0
|
(as Ni)
|
Selenium
|
0.02
|
(as Se)
|
Silver
|
0.05
|
(as Aq)
|
Zinc
|
0.5
|
(as Zn)
|