DR/2400
Oxygen Scavengers
OxygenSca_PP_Other_IRD_Eng_Ody.fm Page 1 of 4
• Temperature and time affect results. Be sure to control these factors as described below.
• Analyze samples immediately. Do not preserve for later analysis.
• The sample temperature should be 25 ±3 °C (77 ±5 °F).
• Soak glassware with 1:1 hydrochloric acid solution. Rinse several times with deionized water. These two steps will remove iron
deposits that can cause slightly high results.
• Wipe the outside of sample cells before each insertion into the instrument cell holder. Use a damp towel followed by a dry one to
remove fingerprints or other marks.
• To determine ferrous iron concentration, repeat the procedure, but do not add DEHA Reagent 2 (step 5). Correct for the ferrous
iron concentration by touching Options and Reagent Blank. Touch On. The reading attributed to the ferrous iron concentration
will appear. Touch OK.
Oxygen Scavengers
Method 8140
Iron Reduction Method for Oxygen Scavengers
Powder Pillows
5 to 600 µg/L carbohydrazide;
3 to 450 µg/L DEHA;
9 to 1000 µg/L hydroquinone;
13 to 1500 µg/L iso-ascorbic acid [ISA];
15 to 1000 µg/L methylethyl ketoxime [MEKO]
Scope and Application: For testing residual corrosion inhibitors (oxygen scavengers) in boiler feed
water or condensate
1. Touch
Hach Programs.
Select from the following
programs:
180 O Scav-Carbohy
181 O Scav-DEHA
182 O Scav-Hydro.
183 O Scav-ISA
184 O Scav-MEKO
Touch Start.
2. Fill a round sample
cell with 25 mL of sample
(this is the prepared
sample).
When determining
oxygen scavengers that
react quickly with oxygen
at room temperature, cap
the sample cell.
3. Fill a second sample
cell with 25 mL of
deionized water (this is
the blank).
4. Add the contents of
one DEHA Reagent 1
Powder Pillow to each
sample cell. Swirl to mix.
Tips and Techniques
Powder Pillows Method 8140
Hach Programs
10 mL
20 mL
25 mL
10 mL
20 mL
25 mL
10 mL
20 mL
25 mL
10 mL
20 mL
25 mL
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