WKS 276230 Manual De Instrucciones página 57

Methods
GB
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
Borate (as Na B O
2 4
Cobalt
Copper
Hardness (as CaCO
Lignosulfonates
Manganese
Molybdenum
Nickel
Phosphate
Phosphonates
Sulfate
Zinc
Reagent
Set (100 Tests)
VARIO OXYSCAV 1 Rgt
VARIO DEHA 2 Rgt Solution
Interference
) 500 mg/l
7
0.025 mg/l
8.0 mg/l
) 1000 mg/l
3
0.05 mg/l
0.8 mg/l
80 mg/l
0.8 mg/l
10 mg/l
10 mg/l
1000 mg/l
50 mg/l
Form of reagent/Quantity
Powder Pack / 200
Liquid reagent / 100 ml
Order-No.
536000