The fluorspar sample was treated with HF, then fumed with HClO_4.After cooling, the residue was dissolved by adding HCl and boric acid with gentle heating.

• 该方法是将氟石样品经过氢氟酸去除硅,高氯酸冒烟,冷却后再用盐酸、硼酸加热溶解等处理过程,标准溶液中需加入与样品相匹配的钙基体进行测定。