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[求助] 哪位朋友知道differential dissolving (DD)这种测试方法吗?

文献中关于dd的描述

The method of differential dissolving (DD) was used to determine stoichiometric compositions of phases in the samples. To provide dissolution, the powder samples were treated with an aqueous solution; the concentration of HCl was linearly increased from 0 to 1.2 N. The main process of dissolution proceeds when H2SO4 - H3PO4 - HClO4 - HNO3, 6:3:1.5:1 (acid mixture-water, 1:10) and it stops in the HF solution (diluted 1:5). The temperature was gradually increased from 20 to 70℃.

最后那些酸什么意思,也不是特明白,希望有高人能指点一下。
还有就是测试结果的图,文章分析的不明白,也希望有高人能指点一下
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