LaMotte AMMONIA NITROGEN TEST KIT NANR User Manual
Page 3
concentration of unionized ammonia is present when the pH value and
salinity increase.
1.
Consult the table to find the percentage that corresponds to the
temperature, pH and salinity of the sample.
2.
To express the test result as ppm Unionized Ammonia Nitrogen
(NH
3
–N), multiply the total ammonia-nitrogen test result by the
percentage from the table.
3.
To express the test result as ppm Ammonia Nitrogen (NH
4
+
–N),
subtract the unionized ammonia-nitrogen determined in Step 2 from
the total ammonia-nitrogen.
Percentage of Free Ammonia as (NH
3
) in Freshwater
1
(FW)
and Seawater
2
(SW) at varying pH and Temperature
10°C
15°C
20°C
25°C
pH
FW
SW
FW
SW
FW
SW
FW
SW
7.0
0.19
0.27
0.40
0.55
7.1
0.23
0.34
0.50
0.70
7.2
0.29
0.43
0.63
0.88
7.3
0.37
0.54
0.79
1.10
7.4
0.47
0.68
0.99
1.38
7.5
0.59
0.459
0.85
0.665
1.24
0.963
1.73
1.39
7.6
0.74
0.577
1.07
0.836
1.56
1.21
2.17
1.75
7.7
0.92
0.726
1.35
1.05
1.96
1.52
2.72
2.19
7.8
1.16
0.912
1.69
1.32
2.45
1.90
3.39
2.74
7.9
1.46
1.15
2.12
1.66
3.06
2.39
4.24
3.43
8.0
1.83
1.44
2.65
2.07
3.83
2.98
5.28
4.28
8.1
2.29
1.80
3.32
2.60
4.77
3.73
6.55
5.32
8.2
2.86
2.26
4.14
3.25
5.94
4.65
8.11
6.61
8.3
3.58
2.83
5.16
4.06
7.36
5.78
10.00
8.18
8.4
4.46
3.54
6.41
5.05
9.09
7.17
12.27
10.10
8.5
5.55
4.41
7.98
6.28
11.18
8.87
14.97
12.40
1
Freshwater data from Trussel (1972).
2
Seawater values from Bower and Bidwell (1978). Salinity of Seawater values = 34% at an ionic
strength of 0.701 m.