毕业论文 不同产地中药材中有害元素铅镉砷的测定.docVIP

不同产地中有害元素铅镉砷的测定 4种重金属的含量 摘要：近年来，中药中重金属含量超标问题受到了人们的广泛关注，而且目前国内对中药中重金属的检测尚无规范、灵敏的测定方法。本文主要是为建立金银花、野菊花和银杏叶3种中药中痕量重金属元素铅、砷、镉、铜的含量测定方法和技术标准。通过对仪器参数进行优化，确定了最佳实验条件。在优化的实验条件下，采用原子荧光测定药材中的砷的含量，采用原子吸收测定铜、铅、镉的含量。铅、砷、镉、铜的的检出限分别为 ,线性范围分别为 。本研究方法操作简单，快速，且灵敏度、自动化程度高，适用于中药中痕量铅，砷，镉，铜的含量测定，结果令人满意。 关键词：原子吸收法 原子荧光法 中药材4种重金属 测量方法 技术标准 Determination for four kinds of heavy metal in Chinese medicines by atomic absorption spectrometry and atomic fluorescence spectrometry . Jinying Huang (Zhongshan Polytechnic) Abstract：Objective Recently, the problem of superscale heavy metals in Chinese traditional medicines is widely concerned .However, no canonical and sensitive methods to determine heavy metal in Chinese traditional medicines are upbuild yet interiorly. The subject of “Study on determination for four kinds of heavy metal in Chinese medicine by atomic absorption spectrometry and atomic fluorescence” The mainly for established a kind of Detection Method and Testing Standard that the method for determination of four kinds of metal in Honeysuckle, Wild chrysanthemums and Ginkgo leaves. Methods The experimental conditions were optimized by optimizing instrument parameters such as lam p current，carrier gas flow ，shield gas flow，dry and ash. At the optimal conditions，the effects for Pb , As, Cd and Cu were as follows：detection limits gL , and 0．01 sL respectively；linear ranges 0~40gL and 0~41gL. Conclusion This method is simple，rapid and has been applied to the detemdnati0n of trace lead，arsenic and mercury with satisfactory results． Key words：Atomic absorption spectrometry, Atomic fluorescence, Four kinds of heavy metal in Chinese medicines, Detection method ,Testing standard 目录 原子光谱法测定中药中4种重金属的含量 1 第一章 文献综述 5 1.1.重金属对中药发展的影响 5 1.2.中药中重金属的来源 6 1.3. 重金属对人体健康的影响 6 1.3.1铅(Pb) 6 1.3.2砷(As) 6 1.3.3镉(Cd) 7 1.3.4铜 7 1.4.中药材中重金属元素的检测技术 7 1.4.1原子荧光光谱法 7 1.4.2原子吸收光谱法 8 参考文献 9 第二章 原子荧光法对中药材中砷的检测 10 2.1 仪器与材料 10 2.2 仪器条件的优化 10 2.2.1 消化剂种类及用量 10 2.2.2 优化KBH4浓度 10 2.2.3 优化KOH浓度 10 2.2.4 载流液浓度 11 2.2.