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，所溶样条件下所得硼的分析结是否为全硼问题进行了进一，结证实，所溶样条件下硼的测定结为全硼。