Abstract
Reproducibility, sensibility and selectivity are standard parameters on the development of sensors. In this article we described a planar electrochemical sensor based silk-screened to detect nitrite and its interferers - paracetamol, ascorbic acid and uric acid. We modified the working electrode gold surface by using 1-2 diaminobenzeno (DAB) membrane in order to reduce the interferers. Preliminary results showed which using DAB there is decrease of interference signal about three times. We obtained a sensibility about 310 μA/(mol.L-1.mm2) for nitrite, using plain electrode and 90 μA/(mol.L-1.mm2) after DAB membrane. Although the actual results are promising, we are evaluating several combinations of membranes to reduce more the influence of the interferers in the nitrite detection.
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