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NOTE: HR Reagent must be made fresh each week. If reagent is refrigerated, it may be
kept up to 3 weeks.
PROCEDURE–HIGH RANGE
A. PREPARATION OF HR REAGENT
NOTE: The quantity of Indigo Blue Stock Solution (3989) supplied will prepare one batch
of HR Reagent for the High Range Ozone procedure or fi ve batches of HR Reagent for
the Low Range Ozone procedure.
1. Use the 50 mL graduated cylinder to carefully add 25 mL of *Ozone Buff er (3991)
to amber glass bottle marked HR Reagent (3988-MT-G).
2. Use the 50 mL graduated cylinder to carefully add 25 mL of Indigo Blue Stock
Solution (3989) to the amber glass bottle. Cap and mix.
B. DETERMINATION OF OZONE
3. Use the 1.0 mL transfer pipet (2-2170) and pump (30527) to add 1.0 mL of HR
Reagent (3988) to each of 2 clean tubes (0290).
4. If chlorine is present add 3 drops Chlorine Inhibitor (3990) to each tube. Cap
tubes.
5. Take one of the prepared tubes (0290) and sampling apparatus (0681) to sampling
site.
6. Lower end of tubing of sampling apparatus to desired depth. Slowly withdraw and
depress plunger several times to purge syringe and tubing. Slowly withdraw plunger
to fi ll purged syringe.
7.
Remove plastic tubing from syringe. Remove cap from the prepared tube. Place tip
of syringe against inside of the prepared tube. Slowly depress plunger and fi ll to the
10 mL line and cap. This is the Sample Tube.
NOTE: DO NOT SHAKE OR INVERT THE SAMPLE.
8. Fill the second prepared tube (0290) to the 10 mL line with ozone free water. This is
the Reagent Blank.
9. Press and hold
ENTER
10. Press
to select Testing Menu.
11. Select All Tests (or another sequence containing 072 Ozone IB HR) from Testing
Menu.
12. Scroll to and select 072 Ozone IB HR from menu.
13. Insert the Reagent Blank tube into chamber, close lid and select Scan Blank.
14. Insert reacted Sample Tube into chamber, close lid and select Scan Sample. Record
result.
COD3 Plus Colorimeter 10.16
until colorimeter turns on.
Ozone, Indigo
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