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A new method for quantification of both free and total SO 2 is described. Poly[Ni-(protoporphyrin IX)] (NiPPIX) film at submonolayer-level-modified glassy carbon electrodes showed an important catalytic effect for the oxidation of SO 2 . This modified electrode is an useful tool in chemical analysis when it is incorporated to an amperometric detector in a flow or in a stirred system...
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