Determination of sulfur dioxide in vitriol plant wastewater by using a polyNiMe₄TAA electrochemically modified Pt microelectrode

A Pt microelectrode modified with nickel(II) polytetramethyldibenzo[b,i]tetraaza[14]annulene was prepared by electropolymerization of nickel(II) tetramethyldibenzo[b,i]tetraaza[14]annulene monomers and applied to determine sulfur dioxide in vitriol plant wastewater. For determination of SO₂ with this electrochemically modified. Pt microelectrode, the linear range was from 9.6 × 10^-6 to 2.4 × 10^-4 mol L^-1, the sensitivity was 1.8 × 10^-4 A L mol^-1, the detection limit was calculated to be 4.8 × 10^-6 mol L^-1 (S/N = 3), the response time was less than 20 s and the relative standard deviation was found to be 2.1% on analyzing 4.8 × 10^-5 mol ^-1 SO₂ solution repeatedly (n = 7). These results demonstrated good accuracy compared with those obtained by the conventional iodimetric method.