hydrofluoride

By fuming with sulfuric-phosphoric acid mixture the residual hydrofluoride was then expelled，and boron was finally determined by curcumin spectrophotometry after distillation.

同时，对所拟溶件下所得硼的析结是否为全硼问题进行了进一步探讨，结证实，所拟溶件下硼的测定结为全硼。