《原子荧光法测定云木香中的镉》-毕业设计（论文）.doc

l l PAGE 1 2012年度本科生毕业论文 原子荧光法测定云木香中的镉 院 － 系： 理学院　化学系 专 业： 化学专业 年 级： 2008级 学生姓名： 学 号： 200710050528 导师及职称： 2012年6月 2012Annual Graduation Thesis (Project) of the College Undergraduate Determination of Cadmium in radix saussureae lappae by Atom Fluorescence Spectrometry Department: Department of Chemistry, College of Science Major: Chemistry Grade: 2008 Student’s Name: Yang Tianpei Student No.: 200710050528 Tutor: Assistant Pan Qingshan Finished by June, 2012 l 红河学院本科毕业论文（设计） 摘 要 本文用原子荧光光谱法测定云木香中镉的含量。研究了仪器工作条件、载流的盐酸浓度、硼氢化钾浓度及等对测定影响的因素，建立了原子荧光光谱法测定云木香中镉的最佳工作条件。 本实验采用HNO3-H2O2体系高压消解木香试样，在确定的最佳工作条件下测定了木香中镉的含量。实验结果表明，镉标准溶液浓度在0～12ug/L范围内，以浓度为0.45%的硫脲溶液和浓度为0.5 mg/L的钴溶液为测定云木香中镉的基本改进剂浓度，用2%盐酸载流液和1%浓度的硼氢化钾在300V负高压条件下测定所得荧光强度线性关系最好，回归方程为：Y=29.50C+19.06 r=0.9996，本实验测得镉的检出限为0.00049μg/L，精密度为0.37%；回收率试验所得结果为：85.0%~102.5%；同时测得云木香中镉的含量为0.0626mg/kg。 关键词:原子荧光法；云木香；Cd l l PAGE 1 ABSTRACT In this paper, the cadmium content in the Radix saussureae lappae was determined by atomic fluorescence spectrometry. the current-carrying hydrochloric acid concentration, borohydride potassium concentration , working conditions of the instrument and other Influence factors was studied, Through this experiment a method was established that the Cadmium of the Radix saussureae lappae was determination by atomic fluorescence spectrometric in best working conditions. A digestion system using HNO3-H2O2 under high pressure was applied for the pretreatment of the samples. the content of cadmium combination in Radix saussureae lappae was determinationed in the best working conditions. The experimental results show that the concentration of the cadmium standard solution in 0 ~ 12μg /L, With the concentration of thiourea is 0.45% and the concentration of cobalt is 0.5 mg/L, hydrochloric acid was 2% and the concen