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
Aside from the approximate analysis for <sup>17</sup>O by mass spectrometry in the early 1930s, precise measurement was begun by Nier in 1950, but he calibrated his mass spectrometer with enriched argon is...Aside from the approximate analysis for <sup>17</sup>O by mass spectrometry in the early 1930s, precise measurement was begun by Nier in 1950, but he calibrated his mass spectrometer with enriched argon isotopes for the inlet gas CO<sub>2</sub>. His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Aside from the approximate analysis for <sup>17</sup>O by mass spectrometry in the early 1930s, precise measurement was begun by Nier in 1950, but he calibrated his mass spectrometer with enriched argon isotopes for the inlet gas CO<sub>2</sub>. His
