钾—氩年代学中钾的准确测定

岩石矿物中钾的测定,目前大多数实验室都采用火焰光度法。该法虽然简单快速,但是准确度较差。部颁岩石矿物分析钾测定允许偶然误差范围较大,就充分说明了这个问题。采用这种方法所获得的结果,能满足地质科研,生产的一般要求,但难于满足某些方面的特殊要求。随着地质年代学的

The Accurate Determination of Potassium for K-Ar Dating

Potassium has to be determined accurately in studies of geological age bythe potassium-argon method. This paper recommends a procedure for theaccurate determination of potassium. In order to overcome the interferencesfrom other elements in rocks and minerals, potassium was separated from aliquotsof sample solutions by cation-exchange chromatography on Dowex 50W × 4 or71-616 resin columns Solutions were prepared gravimetrically instead of volu-metrically. Possible contamination due to potassium in glassware was avoidedby the use of platinum, quartz and polyethIend vessels. The accuracy may begreatly raised after the determination of potassium by AAS. Six standard samples were measured many times in this way, and the re-sups agreed well with those obtained from laboratories in U. S. A. and Austra-lia. The relative standard deviations do not exceed 3% of the mean resultwithin 1-10% of potassium. The procedure may be applied to the accuratedetermination of potassium in K-Ar dating and other fields.