中文摘要：

报道了本实验室近两年来Neptune MC-ICP-MS测试Nd同位素的结果。测试结果显示样品化学分离中伴随的大量铈对钕同位素组成测定没有影响；而分离后残余少量钐，在一定范围内（钐／钕〈0．04）可以直接扣除，获得准确的Nd同位素组成。Neptune MC-ICP-MS和热电离质谱（TIMS）平行测定实际地质样品表明，Neptune MC-ICP-MS可以精确测定Nd同位素组成，与经典的TIMS技术相比，MC-ICP-MS可以获得与TIMS相媲美的数据精度，而且分析时间缩短，效率明显提高。

英文摘要：

This paper reports the measurement of the neodymium isotopic composition by neptune muhiple collector inductively coupled plasma mass spectrometry （MC-ICP-MS） over last two years. For the cerium concomitant with neodymium in the chemical separation, there is no significant influence on the neodymium analysis. As for the sample containing small amount of samarium （ Sm/Nd 〈 0.04） , direct calibration for isobaric interference and mass discrimination by the exponential law can be obtained by assuming that samarium mass discrimination is the same as that of neodymium. Geological samples after traditional chemical separation were measured by neptune MC-ICP-MS and thermal ionization mass spectrometry （TIMS）, respectively. The results show that Neptune MC-ICP-MS can precisely measure neodymium isotopic composition as the TIMS does, even more effective and less tidae-consuming than the TIMS Method.