In the same acid system, the sequence of adding acid can influence the assay of heavy metals in soil, especially of Cr.
2
测定的重金属元素包括：铜、铅、镉、铬。
The heavy metal elements which was measured was Lead, Cadmium, Chromium and Copper.
3
蒸酸后残液中的镍、铬、铁等有价金属元素含量可提高一倍以上，为其综合利用奠定了基础。
The content of valuable metal, such as Ni, Cr, and fe in residual liquors can be doubled after evaporation treatment. This will be in favor of the effective use.
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