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

同，对所拟溶样条件下所得硼的分析是否为全硼问题进行了进一步探讨，实，所拟溶样条件下硼的测定为全硼。