Ammonia
Ammonia
Total Ammonia Nitrogen (mg/L) **
The toxicity of ammonia relates primarily to the un-ionized form (NH3). The concentration of un-ionized ammonia present in water increases with pH and temperature. The values below represent total ammonia-nitrogen concentrations (at various temperatures and pH levels) above which accompanying NH3 concentrations may be harmful to aquatic life.
Total Ammonia (NH3 + NH4+)
(maximum levels expressed as N at various pH/temperature conditions)
|
Toxicity of Ammonia under varying Temperature and pH Conditions |
|||||||
|
|
0° |
5° |
10° |
15° |
20° |
25° |
30° |
|
6.50 |
2.06 |
1.97 |
1.81 |
1.81 |
1.22 |
0.85 |
0.60 |
|
6.75 |
2.06 |
1.97 |
1.81 |
1.81 |
1.22 |
0.85 |
0.61 |
|
7.00 |
2.06 |
1.97 |
1.81 |
1.81 |
1.22 |
0.85 |
0.61 |
|
7.25 |
2.06 |
1.97 |
1.81 |
1.81 |
1.23 |
0.86 |
0.61 |
|
7.50 |
2.06 |
1.97 |
1.81 |
1.81 |
1.23 |
0.87 |
0.62 |
|
7.75 |
1.89 |
1.81 |
1.73 |
1.64 |
1.15 |
0.81 |
0.58 |
|
8.00 |
1.26 |
1.18 |
1.13 |
1.09 |
0.76 |
0.54 |
0.39 |
|
8.25 |
0.72 |
0.67 |
0.64 |
0.62 |
0.44 |
0.32 |
0.23 |
|
8.50 |
0.40 |
0.39 |
0.37 |
0.37 |
0.26 |
0.19 |
0.15 |
|
8.75 |
0.23 |
0.22 |
0.21 |
0.22 |
0.16 |
0.12 |
0.09 |
|
9.00 |
0.13 |
0.13 |
0.13 |
0.13 |
0.11 |
0.08 |
0.06 |
** excerpt from the "Surface Water Quality Objectives", Water Quality Branch Saskatchewan Environment and Public Safety, November, 1988 (WQ 110)
Page last modified: 26 November 2019 09:59