开放性实验:二氧化硫的微萃取及智能手机比色法辅助的快速定量分析OA

Open-ended experiment courses play a crucial role in cultivating practical skills,in-novative thinking and scientific literacy of undergraduate students.In this project,an open-ended experiment was designed and implemented with the theme of quantitative detection of sulfur dioxide(SO2)gas pollutants using smartphone-based colorimetry.During the experiment,volatile SO₂ in samples was enriched using headspace single-drop microextraction.In the single-drop system,SO2 reacted with silver nanoparticles,inducing a distinct color change.SO2 concentration was quantified through colorimetric analysis using a smartphone as a portable detection platform.This experiment guided students to employ smartphones as a novel portable detection platform,inspiring the in-novative application of diverse scientific tools.The design covered fundamental analytical chemistry skills,including calibration curve construction,sample quantification and colorimetric analysis.Advanced techniques,such as microextraction and nanoparticle-mediated color reactions,were also introduced.This open-ended experiment course enables undergraduates to understand the core principles of colorimetric analysis in environmental monitoring,fostering a comprehension of the close link between theory and practical techniques in real research contexts.Throughout the ex-periment,students experience both the rigor and creativity of scientific exploration,while rec-ognizing the broader significance of scientific experimentation in environmental protection,societal development and national technological advancement.Consequently,the course facilitates the internalization of scientific spirit,social responsibility and professional mission,achieving a deep integration of professional competence with values-based education.