在一九五五年本刊中,笔者曾写一文介绍原子量的测定方法,即化学法、气体密度法和质谱法。近十余年来,用前两种方法从事原子量测定的科学家已寥寥无几,而原子量测定渐趋于采用物理方法。赫尔施们德-魏特纳(Hirschbold-Wittner)在回顾明兴大学原子量实验室的工作时,曾指出:那里用化学法测定原子量的工作已暂时告一段落,可能不会再大规模出现,因为原子量测定的重点渐渐移向质谱法。我们不得不承认后起之秀的质谱法测定原子量的准确度一般已超过化学法和气体密度法,以致近年来的原子量的 In 1955, we wrote a paper describing the atomic weight determination method, namely chemical method, gas density method and mass spectrometry. In the past decade or so, few scientists have used atomic mass spectrometry for the first two methods, and atomic mass spectrometry has tended to use physical methods. Hirschde-Wittner, reviewing the work of the Atomic Weight Laboratory at Ming Hing University, pointed out: There has been a temporary cessation of the chemical measurement of atomic weight there and it may not occur again on a large scale, Because the focus of atomic mass measurement gradually shifted to mass spectrometry. We have to admit that the rising star mass spectrometry has generally exceeded the accuracy of the atomic mass method by chemical and gas-density methods, so that in recent years the atomic weight