Continuous Determination of Zinc and Magnesium Concentrations in Unknown Solutions Based on Artificial Intelligence Visual Aided Technology and pH Sensing
WANG Zi-Han, DING Ning, ZHOU Shu-Han, YAN Jing-Yu, LIU Hong-Yun**
Key Laboratory of Radiopharmaceuticals, Ministry of Education, College of Chemistry, Beijing Normal University, Beijing 100875, China
Abstract The continuous titration of two metal ions is one of compulsory contents in basic chemistry experiments for science colleges and universities in higher education.This paper designed a new experiment for the continuous determination of zinc and magnesium contents in zinc-magnesium mixed solutions based on artificial intelligence(AI) visual assistance and pH sensing technology.Based on the principle of complexometric titration in chemical analysis,the continuous titration of two metal ions in the mixed ion solution with ethylenediaminetetraacetic acid(EDTA) standard solution was realized by controlling the acidity of the solution.With the help of pH sensors to real-time control the titration reaction conditions,it solved the problem of reagent loss caused by the use of pH test paper in traditional experiments and avoided the use of acid-base indicators that interfere with the judgment of the end-point color.In addition,a new strategy using methylthymol blue(MTB) indicator was proposed in this work.Combined with AI visual assistance technology,it could real-time identify and analyze the end-point color change of complexometric titration,quickly and accurately judge the titration end-point,and greatly improve the experimental efficiency.The results of practical application showed that the new method had small relative average deviation,good repeatability,simple device and easy popularization,providing an efficient,reliable and intelligent new case for the continuous determination of two metal ions in complexometric titration.The design of this experiment responded to the concept of green chemistry for sustainable development,improved students’ digital application ability,and enhanced their innovative thinking and scientific literacy through the process of experimental expansion and verification.
WANG Zi-Han, DING Ning, ZHOU Shu-Han, YAN Jing-Yu, LIU Hong-Yun. Continuous Determination of Zinc and Magnesium Concentrations in Unknown Solutions Based on Artificial Intelligence Visual Aided Technology and pH Sensing[J]. Chinese Journal of Chemical Education, 2026, 47(2): 61-69.
