As we know that the element B,C,N,ando are so called ultralight element in EPMA, and great difficulties were encountered in the determination of these elements.

• 碳、硼、氮及氧等元素在电子探针分析中常称之为超轻元素。这些元素的定量分析还存在许多包括测量和定量修正方面的困难。