Table of Contents
Advertisement
before each test and the same tube should be used for the blank and the
reacted sample.
NOTE: For the best possible results, carry a reagent blank through the
procedure. After scanning the blank, perform the test procedure on clear,
colorless, distilled or deioized water. Subtract results of regent blank from all
subsequent test results.
CALCULATIONS
To express results as Unionized Ammonia (NH
To express results as Ionized Ammonia (NH
Ammonia in water occurs in two forms: toxic unionized ammonia (NH
the relatively non-toxic ionized form, ammonium ion (NH
measures both forms as ammonia-nitrogen (NH
ammonia-nitrogen concentration in water. The actual proportion of each
compound depends on temperature, salinity, and pH. A greater concentration
of unionized ammonia is present when the pH value and salinity increase.
1.
temperature, pH and salinity of the sample.
2. To express the test result as ppm Unionized Ammonia Nitrogen (NH
multiply the total ammonia-nitrogen test result by the percentage from
the table.
3. To express the test result as ppm Ionized Ammonia Nitrogen (NH
subtract the unionized ammonia-nitrogen determined in Step 2 from the
total ammonia nitrogen.
pH
7.0
7.1
7.2
7.3
7.4
7.5
7.6
7.7
7.8
7.9
8.0
8.1
8.2
8.3
8.4
8.5
1.800.561.8187
Unionized Ammonia (NH
Ionized Ammonia (NH
10°C
FW1
SW2
0.19
0.23
0.29
0.37
0.47
0.59
0.459
0.74
0.577
0.92
0.726
1.16
0.912
1.46
1.15
1.83
1.44
2.29
1.80
2.86
2.26
3.58
2.83
4.46
3.54
5.55
4.41
www.
):
3
) = ppm Ammonia Nitrogen (NH
3
):
+
4
) = ppm Ammonia Nitrogen (NH
+
4
-N) to give the total
4
15°C
20°C
FW
SW
FW
0.27
0.40
0.34
0.50
0.43
0.63
0.54
0.79
0.68
0.99
0.85
0.665
1.24
1.07
0.836
1.56
1.35
1.05
1.96
1.69
1.32
2.45
2.12
1.66
3.06
2.65
2.07
3.83
3.32
2.60
4.77
4.14
3.25
5.94
5.16
4.06
7.36
6.41
5.05
9.09
7.98
6.28
11.18
9
.com
-N) x 1.2
3
-N) x 1.3
3
) and
3
). This test method
+
4
-N),
3
-N),
+
4
25°C
SW
FW
SW
0.55
0.70
0.88
1.10
1.38
0.963
1.73
1.39
1.21
2.17
1.75
1.52
2.72
2.19
1.90
3.39
2.74
2.39
4.24
3.43
2.98
5.28
4.28
3.73
6.55
5.32
4.65
8.11
6.61
5.78
10.00
8.18
7.17
12.27
10.10
8.87
14.97
12.40
information@itm.com
Advertisement
Table of Contents
