铋膜电极微分电位溶出法测定酒中铅和锌  

Determination of Pb and Zn in Wine by Using Bismuth-Film Electrode by Differential Potentiometric Stripping Analysis

作　　者：董良飞[1] 高云涛[2] 胥义能[2] 

机构地区：[1]云南财贸学院南区,云南昆明650221 [2]云南民族大学化学与生物技术学院,云南昆明650031

出　　处：《酿酒科技》2006年第7期97-98,共2页Liquor-Making Science & Technology

摘　　要：以镀铋膜电极代替汞膜电极为工作电极进行同位镀铋微分电位溶出分析,依据溶出峰值(dt/dE)与被测离子浓度成正比的关系进行定量。结果表明,在HAc-NaAc介质中,铅、锌可在镀铋膜电极上得到灵敏的微分电位溶出峰,峰电位分别为-0.55V和-1.10V,检出限铅为0.02μg/25mL,锌为0.03μg/25mL。该方法无污染,灵敏、简便,是一种快速绿色的分析方法。Bismuth-film electrode, instead of mercury-film electrode, was used as work electrode for differential potentiometric stripping analysis. Pb and Zn could then be determined according to the positive correlations of stripping peak value （dt/dE） and the measured ions concentration. The results suggested that in HAc-NaAc buffer solution （pH4.4） the sensitive stripping peaks （dt/dE） of the ions were obtained（-0.55 V for Pb,-1.10 V for Zn）and the detection limits were 0.02 μg/25 mL for Pb and 0.03 μg/25 mL for Zn. The method had the advantages of high sensitivity, simple operation and rapid determination without pollution, and was a good choice in practice.

关 键 词：酒 微分电位溶出 铋膜电极 铅 锌 

分 类 号：TS261.7[轻工技术与工程—发酵工程]