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，对所拟溶样条件所硼的分析结是否为全硼行了一步探讨，结证实，所拟溶样条件硼的测定结为全硼。