面向无机材料专业的案例式分析化学教学探索与实践

doi:10.3866/PKU.DXHX202206011

Abstract

Abstract:

Chemical analysis plays an important role in the testing and inspection of construction materials, thus it is necessary for students of inorganic nonmetallic materials engineering to understand analytical chemistry well. In this article, a case-based analytical chemistry teaching mode for inorganic nonmetallic materials engineering majors is introduced, wherein application cases of chemical analysis in construction materials testing are integrated into the course, and an effective connection is made between the basic courses and the majors. Through a variety of teaching designs, such as comparative and associative methods, students are encouraged to participate actively in the course to deepen their understanding of theoretical knowledge, enhance their understanding of the practicality and necessity of analytical chemistry in the major, and learn according to the material and needs.

Key words: Analytical chemistry, Construction materials testing and inspection, Inorganic non-metallic materials engineering, Cases design

Cong Wang, Xiaoting Sun, Wenting Zhou, Xiaohang Yuan. Exploration and Practice of Case-Based Analytical Chemistry Teaching in Inorganic Materials Specialty[J].University Chemistry, 2023, 38(2): 71-76.

Figures/Tables 4

滴定分析方法	建筑材料试验项目	滴定反应
酸碱滴定法	外加剂氨释放量测定^[11]	$ \begin{array}{l}{\rm{N}}{{\rm{H}}_3} + {{\rm{H}}_2}{\rm{S}}{{\rm{O}}_4} = {\rm{N}}{{\rm{H}}_4}{\rm{HS}}{{\rm{O}}_4}\\2{\rm{NaOH}} + {{\rm{H}}_2}{\rm{S}}{{\rm{O}}_4} = {\rm{N}}{{\rm{a}}_2}{\rm{S}}{{\rm{O}}_4} + 2{{\rm{H}}_2}{\rm{O}}\end{array}$
酸碱滴定法	水泥净浆氧化钙含量测定	$ \begin{array}{*{20}{c}}{{\rm{CaO}} + 2{\rm{HCl}} = {\rm{CaC}}{{\rm{l}}_2} + {{\rm{H}}_2}{\rm{O}}}\\{{\rm{NaOH}} + {\rm{HCl}} = {\rm{NaCl}} + {{\rm{H}}_2}{\rm{O}}}\end{array} $
配位滴定法	水泥净浆氧化钙含量测定	Ca²⁺ + Y⁴⁻ = [CaY]²⁻ (Y⁴⁻为EDTA酸根)
氧化还原滴定法	水泥净浆氧化钙含量测定	$ \begin{array}{l}{\rm{C}}{{\rm{a}}^{2 + }} + {{\rm{C}}_2}{\rm{O}}_4^{2 - } = {\rm{Ca}}{{\rm{C}}_2}{{\rm{O}}_4} \downarrow \\{\rm{Ca}}{{\rm{C}}_2}{{\rm{O}}_4} + {{\rm{H}}_2}{\rm{S}}{{\rm{O}}_4} = {\rm{CaS}}{{\rm{O}}_4} \downarrow + {{\rm{H}}_2}{{\rm{C}}_2}{{\rm{O}}_4}\\2{\rm{MnO}}_4^ - + 5{{\rm{C}}_2}{\rm{O}}_4^{2 - } = 2{\rm{M}}{{\rm{n}}^{2 + }} + 10{\rm{C}}{{\rm{O}}_2} \uparrow + 8{{\rm{H}}_2}{\rm{O}}\end{array} $
	水泥中硫化物的测定	$\begin{array}{l}5{{\rm{H}}_2}{\rm{S}} + 8{\rm{KI}}{{\rm{O}}_3} = 4{{\rm{K}}_2}{\rm{S}}{{\rm{O}}_4} + 4{{\rm{I}}_2} + {{\rm{H}}_2}{\rm{S}}{{\rm{O}}_4} + 4{{\rm{H}}_2}{\rm{O}}\\6{\rm{N}}{{\rm{a}}_2}{{\rm{S}}_2}{{\rm{O}}_3} + {\rm{KI}}{{\rm{O}}_3} + 6{\rm{HCl}} = {\rm{KI}} + 3{\rm{N}}{{\rm{a}}_2}{{\rm{S}}_4}{{\rm{O}}_6} + 6{\rm{NaCl}} + 3{{\rm{H}}_2}{\rm{O}}\end{array} $
	外加剂中还原糖含量试验	$ \begin{align} & 2{{\text{C}}_{4}}{{\text{H}}_{4}}\text{O}_{6}^{2-}+\text{Cu}{{(\text{OH})}_{2}}={{\left[ \text{Cu}{{\left( {{\text{C}}_{4}}{{\text{H}}_{4}}{{\text{O}}_{6}} \right)}_{2}} \right]}^{2-}}+2\text{O}{{\text{H}}^{-}} \\ & 2{{\left[ \text{Cu}{{\left( {{\text{C}}_{4}}{{\text{H}}_{4}}{{\text{O}}_{6}} \right)}_{2}} \right]}^{2-}}+{{\text{C}}_{6}}{{\text{H}}_{12}}{{\text{O}}_{6}}+5\text{O}{{\text{H}}^{-}}\underrightarrow{\Delta } \\ & {{\text{C}}_{5}}{{\text{H}}_{11}}{{\text{O}}_{5}}\text{CO}{{\text{O}}^{-}}+\text{C}{{\text{u}}_{2}}\text{O}\downarrow +4{{\text{C}}_{4}}{{\text{H}}_{4}}\text{O}_{6}^{2-}+3{{\text{H}}_{2}}\text{O} \\ \end{align} $
	胶粘剂中游离甲醛的测定	$ \begin{align} & \text{HCHO}+\text{NaHS}{{\text{O}}_{3}}=\text{C}{{\text{H}}_{2}}(\text{OH})\text{S}{{\text{O}}_{3}}\text{Na} \\ & 2{{\text{I}}_{2}}+2\text{NaHS}{{\text{O}}_{4}}+2{{\text{H}}_{2}}\text{O}=\text{N}{{\text{a}}_{2}}\text{S}{{\text{O}}_{4}}+4\text{HI}+{{\text{H}}_{2}}\text{S}{{\text{O}}_{4}} \\ \end{align} $
沉淀滴定法	集料中氯化物的测定水泥中氯化物的测定外加剂中氯离子含量试验	这三个试验均采用银量法，离子反应式为： $\text{A}{{\text{g}}^{+}}+\text{C}{{\text{l}}^{-}}=\text{AgCl}\downarrow $

References 11

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Exploration and Practice of Case-Based Analytical Chemistry Teaching in Inorganic Materials Specialty

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