饲料添加剂中微量游离铜的极谱测定  

Polarographic Determination of Trace Free Copper in Feed Additives

作　　者：蔡卓[1] 杜良伟[1] 江彩英[1] 赵静[1] 莫丽君[1] 田颖[1] 

机构地区：[1]广西大学化学化工学院,广西南宁530004

出　　处：《畜牧与饲料科学》2009年第1期89-89,94,共2页Animal Husbandry and Feed Science

摘　　要：提出在H2SO4—EDTA—KNO3—明胶体系中以单扫描极谱测定饲料添加剂中微量游离铜的方法。用硝酸浸取法提取试样中的游离铜。铜的极谱峰电位为-0.2V(相对饱和甘汞电极)。铜浓度在0.1～100μg/mL范围内与峰电流呈良好的线性关系。检出限为0.04μg/mL,RSD为3.3%,加标回收率为97%。该方法简便、快速、测定精度好,可用于实际样品的测定。The method of determining the trace free copper in feed additives by single-sweep polarography in the system H2SO4-EDTA- KNO3-gelatin was put forward. The free copper in sample was extracted by nitrate extraction. The polarographic peak potential of copper was -0.2 V （relative to saturated calomel electrode）. In the range of 0.1-100 μg/mL, the conen, of copper showed good linear relationship with peak current. The detection limit of copper was 0.04 μg/mL, its RSD was 3.3 % and its recovery of standard addition was 97 %.This method was simple and convenient. The determination by this method was fast and precise, so it could be used in the practical determination of samples.

关 键 词：饲料添加剂 极谱法 测定 铜 

分 类 号：S816.7[农业科学—饲料科学]