【摘要】 针对重铬酸钾滴定法测定全铁含量实验中的不足之处进行了改进，探索出一种基于SnCl₂-I₂-AgCl预处理的无汞测铁方法，改进后的实验涉及四大化学平衡理论知识，方法具有更好的重现性、环境友好、成本低，取得了良好的教学效果。更多还原

【Abstract】 In this paper, the deficiencies in the experiment of determining total iron content by potassium dichromate titration are improved, and a mercury-free iron determination method based on SnCl₂-I₂-AgCl pretreatment is explored. The improved experiment involves major knowledge of the four chemical equilibrium theories. The method has better reproducibility, environmental friendliness, low cost, and has achieved good teaching results.更多还原