Color Development Time - Hach POCKET COLORIMETER II Instruction Manual

Nitrogen, Free Ammonia and Chloramine (Mono),

Color Development Time

Test results are strongly influenced by sample temperature. Both reaction periods
in the procedure are the same and depend on the temperature of the sample. The
reaction periods indicated in the procedure are for a sample temperature of
18-20 °C (64-68 °F). Adjust both reaction periods according to Table 1.
Sample Temperature
°C
5
7
9
10
12
14
16
Table 1 Reaction Period
°F
41
45
48
50
54
57
61
1—20
continued
Reaction Period
(Minutes)
10
9
8
8
7
7
6