LaMotte COD Plus Colorimeter 1922-EX2 - Manual (Page 78)

COLOR
PLATINUM COBALT METHOD
· NO REAGENTS REQUIRED
Color in water may be attributed to humus, peat, plankton, vegetation, and
natural metallic ions, such as iron and manganese, or industrial waste. Color is
removed to make water suitable for domestic and industrial use. Color may
have to be removed from industrial waste before it is discharged to a waterway.
APPLICATION:
Potable water and water with color due to natural materials.
RANGE: 0
- 1,000 color units
METHOD: Color is determined by a meter that has been calibrated with
colored standards of known platinum cobalt concentration.
True color, the color of water in which the turbidity has been
removed, is measured.
SAMPLE
HANDLING &
PRESERVATION: Collect all samples in clean glassware. Determine color as
soon as possible to avoid biological or chemical changes that
could occur in the sample during storage.
INTERFERENCES: Turbidity will interfere. Filter before testing.
PROCEDURE
1. Press and hold
ON burton until colorimeter turns on.
2. Press
ENTER to start.
3. Press
ENTER to select TESTING MENU.
4. Select ALL TESTS (or another sequence containing 9 Color) from
TESTING MENU
.
5. Scroll to and select 9 Color from menu.
6. Rinse a tube (0290) with color-free water (distilled or deionized water).
Fill to 10 mL line with color-free water.
7. Insert the tube into chamber, close lid and select SCAN BLANK.
8. Remove tube from colorimeter. Empty tube.
9. Rinse tube with sample water. Fill to 10 mL line with water sample.
10. Insert tube with sample water, close lid and select SCAN SAMPLE. Record
result in color units.
11. Press
OFF button to turn the colorimeter off or press EXIT button to exit
to a previous menu or make another menu selection.
COD PLUS TEST PROCEDURES 2/04 COLOR 1/1