方波伏安法同时测定食物中的铜、铅、锌、镉、铁、钴、镍、锰  

Simultaneous Determination of Copper,Lead,Zinc Cadmium,Iron,Cobalt,Nickel and Manganese in Food by Square Wave Voltammetry

作　　者：封国宁[1] 陈红波[1] 李铁球 

机构地区：[1]核工业部第六研究所,衡阳421001

出　　处：《分析化学》1991年第7期812-815,共4页Chinese Journal of Analytical Chemistry

摘　　要：经过预处理的食物样品:在马福炉中灰化24h,加HNO_3、HClO_4蒸干。残渣用HC1O_4-酒石酸底液提取。首先用方波阳极溶出伏安法测定其中Cu、Pb、Zn、Cd。然后加入氨水使pH约为9.5,用方波阴极伏安法测定Fe、Mn。最后加入丁二酮肟溶液,用方波吸附伏安法测定Ni、Co。The food sample pretreated. is dissolved in nitric acid and perchloric acid. and evaporated to dryness. The residue is dissolved in 10 m1 mixture containing 0. 05 mot/L parchloric acid and 0. 03 mol/L tartaric acid. Zn、Cd、Pb and Cu are determined by square wave anodic stripping voltammetry at-1. 20～0. 15 V(vs. A g/A gCl). The sample solution is further treated with ammonium hydroxide at pH about 9. 5. Fe and Mn are determined by square wave cathodic voltammetry at-T. 20～1. 70 V, Final1y 20 μl 5x10^-2 mol/L dimethylglyxime solution is added, Ni and Co are determined by square wave adsorption voltammetrv at-0. 90～-1. 30 V.

关 键 词：食物 铜 铅 锌 镉 方波伏安法 

分 类 号：TS207.3[轻工技术与工程—食品科学]