How can I take the pH of a sulfide-containing solution?

I'm interested in being able to take the pH of a solution using a pH probe. The solution contains a small quantity of free sulfide ions, which I'm told poison pH probes. I realize I could calculate the pH doing a titration, but for my purposes this can't be done.



The best method I've come up with would be to add some reagent to selectively precipitate the sulfur without significantly changing the pH. As far as I can tell, barium chloride would be appropriate for this purpose, since BaS is insoluble and BaCl2 shouldn't affect the pH. I realize there are plenty of health hazards associated with barium compounds, (and sulfide compounds for that matter) but this is a theoretical experiment at this point. Would BaCl2 precipitate sulfides without affecting pH?



Thanks in advance.How can I take the pH of a sulfide-containing solution?
since sulfides are the conjugate bases of weak acids like H2S or HS- then they will contribute to pH by hydrolysis



(increase pH) ....thus removing them intoto can reduce the pH and not be a meaningful measure of the actual pH. Use of the eletrodes containing Ag can indeed result in poisoning as Ag forms a quite insoluble sulfide. Have you thought about using pH test strips, like litmus, or ones that give a narrower pH range than litmus for the developed color , or if the solution is clear enough using a universal indicator for color endpoints of pH ? These are much simpler than titration and depending on what accuracy you need, may suffice and they are readily available and pretty inexpensive . Also, the calomel electrode is much less senstive to the sulfide than a silver based electrode.How can I take the pH of a sulfide-containing solution?
try using an alternate method of calculating pH?

litmus paper is more disposable than probes...
You should be able to find a similar product. If you know the probable pH range then it is best to buy something that will help you measure it more correctly with a pH test strip. For better precision you will need a calibrated pH probe by Siemens, Fisher Scientific, Omega, Cole-Parmer, BDH, Honeywell, or any other local lab equipment supplier:



http://www.cenmed.com/productDetail.asp?

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