Problems with pH measurement in solutions containing vanadium, nickel and iron?

I have solution containing 18g/L V(X) + 4g/L Ni(II) and 4g/L Fe(III). solution is acidic and contains about 0.02M of H2SO4. I expect that pH probe will show pH around 0.5, however this valu is...

03 March 2018 6,694 4 View