I am doing a soil column experiment, using quartz sand as a transport medium. We are using 0.001 M NaNO3 as a background solution. Before injection to soil column the pH was adjusted to 7.5 with NaOH and HCl, but after sometime the pH of influent changes and the pH tends to decrease, so does the effluent. After this we used 0.0001 M NaHCO3 to stabilize the pH. The concentration of the influent becomes 0.0009 M NaNO3 + 0.0001M NaHCO3. but still it doesn't work and the pH of influent still tends to decrease. Please help me to solve this issue. I want to keep the pH at 7.5.
Use a buffer at he desired pH and check the concentration of the buffer needed.
To maintain the pH at 7.5 you must use a buffer (a phosphate buffer can be used for this purpose). You have to check the buffer capacity to ensure that it can maintain the pH at the desired value.
I don't know the other details of your research, but I'm supposing the use of the buffer doesn't interfere with your experiments
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