Santrock, Studley and Hayes emphasized in a recent paper on the isotopic analyses based on the mass spectrum of carbon dioxide the necessity of a direct measurement of the absolute abundance of 17O in V-SMOW. Utilizin...Santrock, Studley and Hayes emphasized in a recent paper on the isotopic analyses based on the mass spectrum of carbon dioxide the necessity of a direct measurement of the absolute abundance of 17O in V-SMOW. Utilizing a sample of 46O-water containing 99.991 479 atom% 16O, and the accurate value of R45,NBS-20=0.011 943（24）, previously determined for its liberated CO2, we have found R17,v-CMOW-0.000379 9（8）, corresponding to 0.03790（8） atom% 17O in V-SMOW,展开更多
The method generally employed to test the heavy water product is pycnometry, and the density value found is corrected after having performed the mass spectrometric analysis of the oxygen isotopes. This has been checke...The method generally employed to test the heavy water product is pycnometry, and the density value found is corrected after having performed the mass spectrometric analysis of the oxygen isotopes. This has been checked in our laboratory, and the accuracy found is ±0.02 atom％ D. Another method is to determine the con-展开更多
文摘Santrock, Studley and Hayes emphasized in a recent paper on the isotopic analyses based on the mass spectrum of carbon dioxide the necessity of a direct measurement of the absolute abundance of 17O in V-SMOW. Utilizing a sample of 46O-water containing 99.991 479 atom% 16O, and the accurate value of R45,NBS-20=0.011 943（24）, previously determined for its liberated CO2, we have found R17,v-CMOW-0.000379 9（8）, corresponding to 0.03790（8） atom% 17O in V-SMOW,
文摘The method generally employed to test the heavy water product is pycnometry, and the density value found is corrected after having performed the mass spectrometric analysis of the oxygen isotopes. This has been checked in our laboratory, and the accuracy found is ±0.02 atom％ D. Another method is to determine the con-
