Sulfate-selective electrode and its application for sulfate determination in aqueous solutions

A sulfate-selective electrode based on the composition of a neutral carrier –n-hexyl 4-trifluoroacetylbenzoate – and a quaternary ammonium salt with improved steric accessibility of the exchange center – (2,3,4-tris-dodecyloxy)benzyltrimethylammonium chloride – has been proposed. The effect of plasticizer nature on the main electrode parameters has been studied, approaches for correct sulfate determination in natural objects have been formulated. Determination of sulfate in sea water, mineral water and urine by the methods of direct potentiometry and potentiometric titration has been performed. Relative error of sulfate determination in the samples investigated, did not exceed 7%.