摘要
用方波溶出伏安法测定松花蛋中痕量铅，在抗坏血酸存在下，以0．1mol／L硝酸溶液为底液。玻碳电极为工作电极．测得铅的溶出峰电位是-0．48V。峰高与铅浓度在1．00×10^-4～1．00×10^-6mol／L范围内呈良好的线性关系．铅的检出限为5．00×10^-8mol／L，回收率为90%～108%．此法干扰较少，易于掩蔽，灵敏度较高，适用于松花蛋等食品中微量铅的测定。
In this paper,the method of determination of trace lead in preserved egg with square wave stripping voltrammetry in the presence of ascorbic acid was introduced. In a supporting electrolyte of 0. 1 mol/L HNO3 ,a sensitive stripping peak of lead was found. The peak potential is -0.48 V. The linear relationship between the stripping current and concentration of Pb^2＋ existed in the range of 1.0 × 10^-6-1.0×10^-4 mol/L,the detection limit is 5.0×10^-8 mol/L and the recovery is 90%-108%. The method did not require of removing oxygen and had less interference,good resoIution and accuracy,and therefore it was suitable for determining trace lead in food.
出处
《河北科技师范学院学报》
CAS
2006年第1期35-38,共4页
Journal of Hebei Normal University of Science & Technology
关键词
松花蛋
痕量铅
含量测定
方波溶出伏安法
抗坏血酸
preserved egg
determination of trace lead
square wave stripping voltrammetry methods
ascorbic acid
