大学化学 >> 2022, Vol. 37 >> Issue (5): 2110070.doi: 10.3866/PKU.DXHX202110070

所属专题： 第2届全国大学生化学实验创新设计竞赛

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以分析全过程为导向的分析化学综合实验：石墨炉原子吸收光谱法测定大米中的镉含量

刘秀红(), 刘伟伟, 路贝佳, 赵墨浓, 林聪()   

  • 收稿日期:2021-10-22 录用日期:2021-11-04 发布日期:2022-03-22
  • 通讯作者: 刘秀红,林聪 E-mail:xiuhong0627@163.com;conglin0127@jxstnu.com.cn
  • 作者简介:Email: xiuhong0627@163.com (刘秀红)
  • 基金资助:
    2021年江西省高等学校教学改革研究课题(JXJG-2021-10-36);2021年第二批产学合作协同育人项目(202102095085)

A Comprehensive Analytical Chemistry Experiment Oriented to the Entire Analysis Process: Determination of Cadmium in Rice by Graphite Furnace Atomic Absorption Spectrometry

Xiuhong Liu(), Weiwei Liu, Beijia Lu, Monong Zhao, Cong Lin()   

  • Received:2021-10-22 Accepted:2021-11-04 Published:2022-03-22
  • Contact: Xiuhong Liu,Cong Lin E-mail:xiuhong0627@163.com;conglin0127@jxstnu.com.cn

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摘要：

目前高校开展的分析化学实验内容较单一，忽视了培养学生对分析全过程的质量保证和质量控制的能力，缺乏对学生探究能力和综合素质的培养。因此，我们设计了一项包含样品的制备、方法的适用性验证、样品前处理、上机分析和数据处理以及实验过程中如何做好质量保证和质量控制等步骤的分析化学综合实验。该实验以大米为试样，指导学生利用石墨炉原子吸收光谱仪器、基于外标法定量、综合运用多种质量保证和质量控制措施对大米中的镉含量进行准确测定。本实验涉及到分析的全过程，综合性较强，既有利于学生将所学的理论知识应用于实践分析中，也有利于提高学生分析问题和解决问题的能力，能更好地培养学生的探究性思维。本实验易于操作，实验过程安全性较高，且能在8学时内完成，适合高校中分析化学教研组以小组制、项目化的形式向本科二、三年级的学生开设。

关键词: 分析化学实验, 分析全过程, 质量保证, 镉, 定量分析

Abstract:

Currently, university-level analytical chemistry experiments are relatively simple, which impacts the students' ability to learn quality assurance and quality control techniques for the entire analysis process, and reduces the cultivation of exploration skills and quality of comprehension. Therefore, we designed a comprehensive analytical chemistry experiment which involves sample preparation, method validation, sample pre-treatment, quantitative analysis, and data processing, as well as methods for quality assurance and quality control during the execution of experiments. In this experiment, students were instructed to accurately determine the cadmium content in a rice sample using graphite furnace atomic absorption spectrometry. This experiment is based on an external standard quantitative method, and various quality assurance and quality control methods were used in the analysis process. This comprehensive experiment involves the entire analysis process, which not only helps our students to apply theory to practice, but also helps develop students' problem solving abilities and their thinking abilities. This experiment is easy and safe to operate and can be completed within 8 h. Furthermore, analytical chemistry teaching and research groups in universities may use this as a project for sophomore or junior students.

Key words: Analytical chemistry experiment, Whole process of analysis, Quality assurance, Cadmium, Quantitative analysis