LaMotte DIAGRAM FOR AQ-3 User Manual
Page 13
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To determine the percentage of Ammonia Nitrogen (NH
3
-N) that is
Unionized Ammonia (NH
3
), multiply the test result by 1.2 to convert ppm
Ammonia Nitrogen (NH
3
-N) to Unionized Ammonia (NH
3
), then
consult the following chart.
CONVERSIONS:
To express results as Unionized Ammonia (NH
3
):
ppm Ammonia Nitrogen (NH
3
-N) x 1.2 = Ammonia (NH
3
)
To express results as Ionized Ammonium (NH
4
+
):
ppm Ammonia Nitrogen (NH
3
-N) x 1.3 = Ammonium (NH
4
+
)
Percentage of Free Ammonia as (NH
3
) in Freshwater (FW)
and Seawater (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
Salinity = 34 ppt at an ionic strength of 0.701 m for the Seawater values. Freshwater
data from Trussel (1972); Seawater values form Bower and Bidwell (1978).
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