The sample was decomposed by HF+HClO 4,and the solution containing LaCl 3 and acetone was adjusted to 1% hydrochloric acid medium, the Mg, Mn was directly determined by AAS.

• 试样用 HF与 HCl O4分解 ,用 HCl调节 1%25的酸度后 ,直接用原子吸收光度法测定