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LaMotte DC1600 Colorimeter User Manual

Page 16

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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

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