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本实验对ＥＤＴＡ滴定法间接测定样品中“ＳＯ＿４￣（２－）”的含量时，以水浴代替电炉直接加热进行了探索。结果说明这一方法的改进是有利的，测定结果是可靠的。
In this experiment, indirect determination of the content of “SO_4 ~ (2-)” in the sample by EDTA titration was explored by direct heating with water bath instead of electric furnace. The result shows that the improvement of this method is advantageous and the determination result is reliable.