Abstract

At basic pH values, the integrated system modified electrode / membrane absorber, it is possible to obtain a sensor of sulfite in actual red wine samples. This quantification method consumes small amounts of sample, it is fast and shows good linearity with r(2) of 0.998 and good accuracy. This integrated approach can separate free sulfite red wine matrix with the absorption system of the membrane and, moreover, can be quantified using the electrochemical sensor using NiTSPc modified electrodes, obtaining a concentration of sulfite free 29.8 +/- 0.2 mg.L-1.