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LaMotte DC1600 Colorimeter User Manual

Page 62

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PROCEDURE

NOTE: Place Dispenser Cap (0692) on *Mixed Acid Reagent (V-6278). Save this cap for refill reagents.
1.

Rinse a clean colorimeter tube (0967) with sample water. Fill to the 10 mL line with sample.

2.

Select setting 4 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.

4.

Remove tube from colorimeter and pour off 5 mL into the graduated cylinder (0416). Discard the remaining sample.

5.

Return the 5 mL sample to colorimeter tube. Use graduated cylinder to measure 5 mL of *Mixed Acid Reagent

(V-6278) and add to tube. Cap and mix.

6.

Use the 0.1 g spoon (0699) to add two measures of *Color Developing Reagent (V-6281). Cap and shake tube for

approximately one minute to dissolve the powder. Wait 5 minutes for maximum color development.

7.

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.

8.

Consult calibration chart to determine nitrite-nitrogen concentration in parts per million (ppm).
NOTE: To convert nitrite-nitrogen (N) results to ppm nitrite (NO

2

), multiply results by 3.3.

DC1600 NITRITE-NITROGEN CALIBRATION CHART

%T

9

8

7

6

5

4

3

2

1

0

100

0.001

90

0.004

0.006

0.008

0.010

0.012

0.015

0.017

0.019

0.021

0.024

80

0.026

0.029

0.031

0.033

0.036

0.039

0.041

0.044

0.046

0.049

70

0.052

0.054

0.057

0.060

0.063

0.066

0.068

0.071

0.074

0.077

60

0.081

0.084

0.087

0.090

0.093

0.097

0.100

0.103

0.107

0.110

50

0.114

0.118

0.121

0.125

0.129

0.133

0.137

0.141

0.145

0.150

40

0.154

0.158

0.163

0.168

0.172

0.177

0.182

0.187

0.192

0.198

30

0.203

0.209

0.214

0.220

0.226

0.233

0.239

0.246

0.253

0.260

20

0.267

0.275

0.283

0.291

0.299

0.308

0.317

0.327

0.337

0.348

10

0.359

0.371

0.383

0.397

0.411

0.426

0.442

0.460

0.479

0.500

0

0.523

0.549

0.578

0.612

0.653

0.702

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