《FAAS法测定酸枣汁中锶的含量》》-毕业论文.docVIP

PAGE PAGE 2 精品 分类号： O657.31 单位代码： 108 密 级： 一般 学 号： 1080307014044 本科毕业论文（设计） 题 目： FAAS法测定酸枣汁中锶的含量 专 业： 化学工程与工艺（工业分析方向） 姓 名： 指导老师： 职 称： 教 授 答辩日期： 二零一一年六月四日 . 火焰原子吸收光谱法测定酸枣汁中的锶 摘 要：目的：利用火焰原子吸收光谱法(FAAS)测定酸枣汁中锶的含量。方法：采用离心震荡的方法对样品进行前处理，以EDTA-表面活性剂协同增敏，用空气-乙炔火焰原子吸收法测定酸枣汁的锶含量，并对EDTA-表面活性剂、混合气体、共存离子的干扰、硝酸镧的用量进行实验探讨。结果：当EDTA-聚乙二醇辛基苯醚(OP)存在时，测定锶的灵敏度提高60%。同时以EDTA、硝酸镧作为保护剂、释放剂，可以消除样品中共存离子的干扰。方法线性范围0～50mg·L-1，检出限为0.003 mg·L-1，方法回收率在95.5%～103.8%。结论：此方法简单、快速、准确，用于酸枣汁中锶的测定，结果满意。 关键词：锶；酸枣汁；火焰原子吸收光谱法；表面活性剂 Determination of strontium in jujube juice by FAAS Abstract: Objective: To determine the strontium content in jujube juice by flame atomic absorption spectrometry (FAAS). Methods: The sample was pre-treatment by the method of centrifugal concussion, EDTA-surfactant to increase the sensitivity of cooperative; Establish method of air-acetylene flame atomic absorption spectrometry to determine the Strontium content of jujube juice. Discuss the test of how to eliminate the interference of EDTA-surfactant, mixed gases, ions, and how to determine the amount of lanthanum nitrate. Results: When the EDTA-octal polyethylene glycol phenyl ether (OP) is present, the sensitivity of determination of strontium increased by 60%. Meanwhile, EDTA, lanthanum nitrate as a protective agent, deionization agent, release agent, can eliminate the interference of coexisting elements in the sample. The linear range of 0-50mg·L-1, the detection limit was 0.003 mg·L-1, recovery rates of 95.5%-103.8%. Conclusion: This method is simple, rapid, accurate, which had been applied to the determination of strontium in jujube juice with satisfied results. Keywords: Strontium; Jujube juice; Flame atomic absorption spectrometry; Surfactant 前言 锶Strontium(Sr)在地壳元素中的含量列第15位，以Sr2+形式存在于人体内，参与新陈代谢。锶是人体健康所需的微量元素之一，它具有促进骨骼钙化，预防老年性骨质疏松症，抗牙齿过敏的作用，可抑制