It’s a little tricky to answer but, again, the short answer is no. Remember, pH is based on water, so if you’re using a true solvent that’s not water, like trichloroethylene, you’re not going to have water in your process. That’s the goal of using solvent so you can’t have pH by definition. Now, you can still have acid get into your solvent and in that case you have to do some other interesting things to extract that acid and then measure it but you cannot take a direct pH measurement of solvent, it just won’t work.