比较教学法在仪器分析实验教学中的应用

doi:10.3866/PKU.DXHX201906035

Abstract

Abstract:

Instrumental analysis laboratory is one of the important courses in chemistry and related profession. Combining with the course characteristic and training objective, comparative teaching method has been brought into the classroom teaching. The meaning and function of the comparative teaching method have been pointed out. The practice and application of comparing in laboratory teaching have been introduced. The method has enhanced students' knowledge to all kinds of instruments functions and the features stimulated students' interest in experiment and the innovation spirit. Their cognitive abilities have been continuously built, enriched, improved and developed in the process of comparing. Good teaching results have been achieved.

Key words: Instrumental analysis, Comparative teaching method, Laboratory teaching

Yuliang Jiang,Wentao Bi,Jiangyan Du,Jing Yang. Application of Comparative Teaching Method in Instrumental Analysis Laboratory[J].University Chemistry, 2020, 35(2): 27-32.

Figures/Tables 4

References 15

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类别	AAS	ICP-AES
工作原理	基于气态基态原子对于同种原子发射出来的特征光谱辐射具有吸收能力，再根据辐射强度的减弱程度可对样品中待测元素进行定量分析	根据试样中不同元素的原子或离子在热激发或电激发下，发射特征的电磁辐射而进行元素定性和定量分析的方法
光源	空心阴极灯(灯有寿命，光源稳定性受灯使用时长的影响)	等离子体发射光(温度高，稳定性好)
分析结果	Ca: 38.93 mg∙L⁻¹ (RSD: 0.3411) Mg: 8.178 mg∙L⁻¹ (RSD: 0.3847)	Ca: 38.805 mg∙L⁻¹ (RSD: 0.57) Mg: 8.143 mg∙L⁻¹ (RSD: 1.37)
预热时间	20 min (空心阴极灯预热时间)	120 min (待光室温度到90 °F才能测试)
测试时间	约20 min (一次测一个元素)	10 min (多元素同时测定)
进样体积	4 mL (每个元素约需2 mL)	2 mL
消耗气体	精乙炔(一次实验约10元成本)	高纯氮气(一次实验约100元成本)

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Application of Comparative Teaching Method in Instrumental Analysis Laboratory

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