【摘要】 研究了SO2在示波极谱滴汞电极上的电极行为,结果表明,在磷酸酸性介质中SO2在滴汞电极上于-0.44～-0.46V处有一吸附波,其波高与底液中的SO2质量分数在5.0～100mg/kg范围内有良好的线性关系.采用在底液中添加铁离子的方法抑制氧波干扰,并对10个试样中的SO2进行了测定,RSD为1.11%,样品回收率为93.2%～101.2%.更多还原

【Abstract】 Electrochemical behavior of sulfur dioxide in pH 4.5 phosphate solution containing Fe3+ ion was investigated by oscilloscopic polarography. Sulfur dioxide had an irreversible wave with peak potential at 0.45V (vs.SCE). A linear relationship between the peak height and sulfur dioxide concentration exists in the range of 5～100 μg/mL. Fe3+ ion was added into the detecting solution to eliminate the disturbance from oxygen polarization. The SO2 concentrations in ten samples were detected by this method. RSD is 1.11%, the recovery yield is 93.2%～101.2%, and the detection limit is 7.81×10-5 mol/L.更多还原