Electroanalytical Determination of 4-Nitrophenol by Square Wave Voltammetry on Diamond Electrodes
نویسندگان
چکیده
O comportamento voltamétrico do 4-nitrofenol foi estudado em meio aquoso sobre o eletrodo de diamante dopado com boro usando a voltametria de onda quadrada. Após a otimização dos parâmetros experimentais, o estudo foi realizado em tampão Britton-Robinson com pH 6,0. Nestas condições foi observado somente um pico de oxidação em torno de 1,0 V vs. Ag/AgCl com transferência de dois elétrons e um processo controlado pela adsorção das espécies na superfície do eletrodo. O limite de detecção (LD) obtido foi de 2,8 μg L. Este resultado foi comparado com o obtido nas mesmas condições experimentais mas utilizando o pico de redução do 4-nitrofenol em torno de -0,8 V vs Ag/ AgCl (LD = 4,2 μg L). Os dois valores obtidos para o LD se encontram dentro do limite exigido pela legislação para água potável (30 μg L). A combinação da voltametria de onda quadrada com o eletrodo de diamante dopado com boro mostrou ser uma excelente e desejável alternativa para a determinação analítica de compostos orgânicos.
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