| 金膜电极微分电位溶法测定葡萄酒中砷 |
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| 引用本文： | 施跃坚,;高云涛,;王碧辉.金膜电极微分电位溶法测定葡萄酒中砷[J].微量元素与健康研究,2009,26(4):41-42. |
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| 作者姓名： | 施跃坚 ;高云涛 ;王碧辉 |
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| 作者单位： | |
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| 摘 要： | 目的:建立一种测定葡萄酒中砷的快速测定方法。方法:葡萄酒经硝化后,将As(Ⅴ)还原成有电活性的As(Ⅲ),在硫酸介质中,用金膜电极为工作电极进行微分电位溶出分析,依据溶出峰值(dt/dE)与被测离子浓度成正比的关系定量。结果:在2.0 mol/L H2SO4介质中砷可在镀金膜电极上得到灵敏的微分电位溶出峰(E=—0.19 V),检出限为0.1μg/25 ml,对葡萄酒中的砷进行测定,相对标准偏差:3.6～6.1,加标回收率:95.7%～106.1%。结论:方法灵敏、简便,能用于葡萄酒中微量砷的快速测定。
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| 关 键 词： | 葡萄酒 砷 金膜电极 微分电位溶法 |
Determination of Arsenic in Favorite Wines by Differential Potentiometric Stripping Method with gold membrane electrode |
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| Institution: | SHI Yue - jian,GAO Yun - tao, WANG Bi - hui (1. School of Physics ＆ Electric Engineering; Yunnan Nationalities University; 2. School of Chemistry and Biotechnology ; Yunnan Nationalities University ： Kunming 650031, China ) |
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| Abstract: | Objective：To set up a fast method for the determination of trace arsenic in favorite wines. Method： As（Ⅴ）in nitration sample was reduced to As（Ⅲ）, then As（Ⅲ）was determined by differential potentiometric stripping method with gold membrane electrode in H2SO4 solution. Results： A sensitive stripping peaks （dr/dE） （E =-0.19 V ）of arseric ions were obtained, the detection limit of arsenic was 0.1μg/25ml. The method has been applied to determine trace arsenic in favorite wines with satisfactory results, the RSD （ % ） was 3.6-6.1 and the recovery range was 95.7 %-106.1%. Conclusion： The proposed analytical method had the advantage of high sensitivity, simplicity, and can be used as a fast method to analyze trace arsenic in favorite wines. |
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| Keywords: | Favorite wines Arsenic Gold membrane electrode Differential potentiometric stripping method |
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