用LED灯和乐高积木实现Fe(Ⅲ)的定量测定  

Determination of Fe(Ⅲ) Using LED and LEGO Bricks

作　　者：贾莉[1] 来天成 马锴果[1] 马艳子[1] 赵浩 李维红[1] JIA Li;LAI Tian-Cheng;MA Kai-Guo;MA Yan-Zi;ZHAO Hao;LI Wei-Hong(National Demonstration Center for Experimental Chemistry Education,College of Chemistry and Molecular Engineering,Peking University,Beijing 100871,China)

机构地区：[1]北京大学化学与分子工程学院化学国家级实验教学示范中心,北京100871

出　　处：《化学教育（中英文）》2021年第20期74-78,共5页Chinese Journal of Chemical Education

基　　金：北京大学2019-2020年实验教学改革基金项目。

摘　　要：在普通化学实验中引入以LED灯作为单色光源,用乐高积木和简单电子元件搭建简易光度计的教学环节。自制光度计采用2种方法搭建,结构简单,光路直观,成本低廉。将其用于Fe(Ⅲ)的定量测定,测试结果与商用光度计的测试结果进行比较,验证了自制光度计的性能。结果表明,在测试浓度范围内,吸光度与Fe(Ⅲ)浓度具有良好的线性拟合关系,测试结果满足基本的实验教学需求,可替代该实验中惯用的商用分光光度计。教学实践表明,这种自己搭建仪器并用于定量测定的教学模式,易于激发学生的学习兴趣与热情,增强学生的动手能力、独立思考和解决实际问题的能力,改善了教学效果。In general chemistry lab, a simple photometer was constructed by using monochromatic light-emitting diode(LED), Lego bricks and other electronic components. Two ways of construction were illustrated, featuring the simple structure, visualized light path and low cost. The concentration of Fe(Ⅲ) was measured by the student-made photometer, and the experimental data were compared with that given by a commercial photometer. Within a certain range of concentration, there is a good linear correlation between the absorbance and the concentrations of standard ferric solutions, which well meets the requirements of the basic laboratory teaching. These results reveal that such a simple student-made photometer can be used as an alternative to the commercial photometer in laboratory teaching. Two years of teaching practice and improvement demonstrate that using the student-made photometer in teaching of quantitative determination of Fe(Ⅲ) can inspire the students’ interests and enthusiasm of learning, enhance the hands-on abilities, independent thinking and problem-solving, thus improve teaching effects.

关 键 词：学生自制光度计 Fe(Ⅲ)的定量测定 普通化学实验 

分 类 号：O657.3-4[理学—分析化学] G642.423[理学—化学]