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Les langues disponibles
Ammonia
Salicylate
Calcium
Buffered indicator reagent
Hardness
Buffered indicator reagent
Magnesium
Buffered indicator reagent
Nitrate
Zinc reduction, Diazotization
Nitrite
Diazotization
pH
Mixed indicators
Phosphate
Phosphomolybdate, Stannous
chloride/ascorbic acid reduction
CONVERSIONS
Ammonia (NH
) Ammonia in water occurs in two forms: toxic unionized ammonia (NH
3
relatively non-toxic ionized form, ammonium ion (NH
both forms as ammonia (NH
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. 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 (NH
result by the percentage from the table.
3. To express the test result as ppm Ionized Ammonia (NH
determined in step 2 from the Total Ammonia.
5°C
pH
0 ‰
35 ‰
7.0
0.12
0.10
7.1
0.15
0.12
7.2
0.19
0.16
7.3
0.24
0.20
7.4
0.30
0.25
7.5
0.38
0.31
7.6
0.48
0.39
7.7
0.60
0.49
7.8
0.76
0.62
7.9
0.95
0.78
8.0
1.20
0.98
8.1
1.50
1.23
8.2
1.88
1.54
8.3
2.36
1.94
8.4
2.95
2.43
8.5
3.69
3.04
1
Consult online ammonia conversion calculators for conversion factors for additional pH, salinity,
and temperature conditions.
FOR EXAMPLE: A fresh water sample at 20°C has a pH of 8.5 and the test result is 1.0 ppm as
Total Ammonia.
1. The percentage from the table is 11.02 % (or 0.1102).
2. 1 ppm Total Ammonia x 0.1102 = 0.1102 ppm Unionized Ammonia
) to give the total ammonia concentration in water. The actual
3
10°C
0 ‰
35 ‰
0 ‰
0.18
0.15
0.26
0.22
0.18
0.33
0.28
0.23
0.42
0.36
0.29
0.53
0.45
0.37
0.66
0.56
0.46
0.83
0.71
0.58
1.04
0.89
0.73
1.31
1.12
0.92
1.64
1.40
1.15
2.06
1.76
1.44
2.58
2.21
1.81
3.23
2.76
2.27
4.03
3.45
2.84
5.02
4.31
3.55
6.24
5.36
4.43
7.73
Nitrite above 5 ppm, High concentrations of
reducing agents
Calcium > 800 ppm, Magnesium > 2000 ppm
None
pH <7, pH >9, Borates > 200 ppm
Chlorine neutralizer containing sodium
thiosulfate
Copper > 10 ppm
Turbidity
Iron > 5 ppm, Ammonia >5 ppm
4 +
). This test method measures
), multiply the Total Ammonia test
3
4 +
), subtract the Unionized Ammonia
15°C
20°C
35 ‰
0 ‰
0.22
0.39
0.27
0.49
0.34
0.62
0.43
0.78
0.54
0.97
0.68
1.22
0.85
1.54
10.7
1.93
1.35
2.41
1.69
3.02
2.12
3.77
2.65
4.70
3.32
5.85
4.14
7.25
5.16
8.96
6.41
11.02
9
) and the
3
25°C
35 ‰
0 ‰
35 ‰
0.32
0.58
0.47
0.40
0.72
0.59
0.51
0.91
0.75
0.64
1.14
0.94
0.80
1.43
1.18
1.00
1.80
1.48
1.26
2.26
1.85
1.58
2.82
2.32
1.98
3.53
2.90
2.48
4.40
3.63
3.10
5.48
4.52
3.88
6.80
5.63
4.83
8.41
6.98
6.01
10.37
8.64
7.45
12.71
10.64
9.20
15.49
13.03
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