From the literature, for instance, bubbling Nitrogen gas containing 5000 ppm H2S in deaerated solution will produce a 0.5 kPa H2S partial pressure. Do we have to keep bubbling the gas in order to have a constant 0.5 kPa partial pressure of H2S in the solution.
Can we do it in another way by pressurizing the system at a certain pressure via closing the system and keeping the gas cylinder open to the system.
Is there another way other than continuing bubbling?
hello ! let us assume that initially there is not any h2s dissolved in the solution. once you start bubbling h2s , its concentration will increase until equilibrium is reached between dissolved h2s and h2s fugacity. In theory, if you close all your valves and the temperature remains constant, the concentration in gas and solution should remain constant as well. In practice, you will lose some h2s by gas leaks and corrosion reactions (assuming you have some steel coupons inside your solution), so you must keep the gas flowing at a small flow rate. hope this helps !
The partial pressure of a gas in a solution is related to the concentration of the gas in the gas phase above the solution and its solubility in the solution. In the case of bubbling nitrogen gas containing H2S through a solution, the H2S will dissolve in the solution until an equilibrium is reached between the concentration of H2S in the gas phase and its solubility in the solution.
If you want to maintain a constant partial pressure of H2S in the solution, you would need to continue bubbling the gas to replenish any H2S that escapes from the solution into the gas phase. If you were to close the system and pressurize it, the equilibrium between the gas and the solution would shift, and the partial pressure of H2S in the gas phase would likely increase. This may cause more H2S to dissolve in the solution, leading to a higher partial pressure than the desired 0.5 kPa.
In summary, maintaining a constant partial pressure of H2S in the solution usually requires continuous bubbling to replenish the gas phase. Pressurizing the system and closing it may not achieve the desired partial pressure as it could alter the equilibrium between the gas and the solution.
If continuous bubbling is impractical for your setup, you might explore alternative methods such as using a controlled release system or a gas regulator to maintain the desired partial pressure. It's essential to consider the specific requirements of your experiment or process and consult relevant literature or experts in the field for guidance tailored to your situation.
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