LaMotte DC1600 Colorimeter User Manual
Page 16
PROCEDURE
NOTE: For best results carry a reagent blank through the procedure for greater accuracy. Set the Reagent blank reading to
85%T, which corresponds to 0 ppm ammonia nitrogen, then continue with unknown sample tests.
1.
Rinse a clean colorimeter tube (0967) with sample water. Fill to the 10 mL line with sample.
2.
Select setting 1 on “Select Wavelength” knob and press “30 Second Read” button.
3.
Insert tube into colorimeter chamber and adjust to 100%T with “Set Blank” knob. This is the 100%T blank (See
Note).
4.
Remove tube from colorimeter. Add 8 drops of Ammonia Nitrogen Reagent #1 (V-4797). Cap and mix.
5.
Use the 1.0 mL pipet (0354) to add 1.0 mL of *Ammonia Nitrogen Reagent #2 (V-4798). Cap and mix. Allow
5 minutes for maximum color development.
6.
At end of 5 minute waiting period, press “30 Second Read” button and insert tube into colorimeter chamber. Record
%T as soon as reading stabilizes.
7.
Consult calibration chart to determine ammonia-nitrogen concentration in parts per million (ppm).
DC1600 AMMONIA NITROGEN ~ HIGH RANGE CALIBRATION CHART
%T
9
8
7
6
5
4
3
2
1
0
90
80
0.00
0.01
0.03
0.04
0.06
0.07
70
0.09
0.11
0.12
0.14
0.16
0.17
0.19
0.21
0.23
0.24
60
0.26
0.28
0.30
0.32
0.34
0.36
0.38
0.40
0.42
0.44
50
0.46
0.48
0.51
0.53
0.55
0.57
0.60
0.62
0.65
0.67
40
0.70
0.72
0.75
0.78
0.81
0.84
0.86
0.89
0.93
0.96
30
0.99
1.02
1.06
1.09
1.13
1.16
1.20
1.24
1.28
1.32
20
1.37
1.41
1.46
1.51
1.56
1.61
1.67
1.72
1.78
1.84
10
1.91
1.98
2.05
2.13
2.21
2.30
2.40
2.50
2.61
2.74
0
2.87
3.02
16