I have a flow consisting of 90% Helium and 10% water vapor at 20 mL/min. As my system is pretty sensitive to the presence of O2, I would like to minimize the amount of O2 in the gas flow. I tried degassing the water in liquid phase by bubbling Ar and also boiling, but it seems not to be sufficient. Therefore I thought it is better if I could remove O2 from H2O containing gas flow just before entering the system.
Thanks in advance.
If you are sure that the source of the oxygen is in the water I would recommend better water purification. I would use HPLC quality water. Boiling procedure is known yo be not efficient. According to the old paper: Article Removal of Dissolved Oxygen from Water: A Comparison of Four...
According to them: Nitrogen purging for 20–40 min at flow rate of 25 mL/s was found to be the most effective oxygen removal method. The second method is, as you suggested, passing the gas over the selective oxygen scavenger. I would suggest using the same type of oxygen scavengers as are used in boilers. For example this website for example offers many: https://accepta.com/water-treatment-chemicals-wastewater-effluent-treatment-products/boiler-water-treatment-chemicals/oxygen-scavengers-boiler-water-treatment-chemicals You can check and verify if any of them fits to your experimental conditions.
I also had the same situation of removal of dissolved gases from water before pumping it to the test section. For this purpose the water was being pumped using high pressure nitrogen gas from pressurized water vessel and then later on I applied vacuum degassing before sending it to test section.
Selective oxygen scavenger sounds like a next option for me. Thank you both!
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