在地质年代学研究中,需要获得准确的K-Ar地质年龄。为此,必须准确地测定样品中钾和氩。人们对于氩的分离和测定作了大量研究工作,其方法和手段日趋完善,尤以MM-1200型一类高精度高灵敏度质谱计的使用,使得这一工作达到了几乎完美的地步。但对于钾的测定,目前大部份实验室仍沿用普通火焰光度法,其精度往往难以满足K-Ar年龄 In geochronology studies, accurate K-Ar geologic age needs to be obtained. For this reason, the samples must be accurately measured potassium and argon. A great deal of research has been done on the separation and determination of argon, and its methods and means have been improved day by day. The use of a type of high-precision and high-sensitivity mass spectrometer such as the MM-1200 makes this work reach an almost perfect point. But for the determination of potassium, most laboratories still use ordinary flame photometry, the accuracy is often difficult to meet the K-Ar age