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，对所拟溶样条件下所得硼的全硼问题进行了进一步探讨，证实，所拟溶样条件下硼的测定全硼。