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