示波极谱法测定食品中的二氧化硫  

Determination of Sulfur Dioxide in Food by Oscilloscopic Polarography

作　　者：张添[1] 周心怡[1] 于涛[1] 

机构地区：[1]江南大学食品学院,江苏无锡214036

出　　处：《无锡轻工大学学报（食品与生物技术）》2003年第5期72-75,共4页Journal of Wuxi University of Light Industry

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%.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.

关 键 词：示波极谱法 测定 食品 二氧化硫 食品添加剂 

分 类 号：O657.1[理学—分析化学]