
59
AL110_2 03/2018
Notes:
1. Application: Testing of residual corrosion inhibitors (Oxygen scavengers) in boiler feed
water or condensate.
2. Before using clean the vials with Hydrochloric acid (approx. 20%). Rinse thoroughly
with deionised water.
3. Ideally temperature for full colour development is 25°C ± 3 °C.
4. Volume should always be metered by using suitable pipette (class A).
5. Keep blank and sample dark during colour development time. UV-light (sunlight)
causes high measurement results.
6. Interferences:
• Iron (II) interferes at all concentrations:
Repeat the test procedure but without adding the VARIO DEHA Rgt 2 solution. If the
displayed result is above 20 µg/l subtract this value from the DEHA test result.
• Substances which reduce Iron (III) interfere. Substances which complex iron strongly
may interfere also.
• Substances who may interfere when present in concentrations at:
Substance
Interference
Borate (as Na
2
B
4
O
7
)
500 mg/l
Cobalt
0.025 mg/l
Copper
8.0 mg/l
Hardness (as CaCO
3
)
1000 mg/l
Lignosulfonates
0.05 mg/l
Manganese
0.8 mg/l
Molybdenum
80 mg/l
Nickel
0.8 mg/l
Phosphate
10 mg/l
Phosphonates
10 mg/l
Sulfate
1000 mg/l
Zinc
50 mg/l
Reagent
Form of reagent/Quantity
Order-No.
Set (100 Tests)
VARIO OXYSCAV 1 Rgt
VARIO DEHA 2 Rgt Solution
Powder Pack / 200
Liquid reagent / 100 ml
4536000
GB
Methods
Содержание AL 110
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