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《Acta Agriculturae Nucleatae Sinica》 1987-03
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THE CO_2-H_2O EQUILIBRIUM OF ANALYSIS ~(180)O IN WATER BY MASS-SPECTROMETER

Liu Zeyin Wang Zhidong He Fengru Hou Jingqin Zhu Chengzhi Zhou Fayong You Chongbiao (Institute for Application of Atomic Encrey, CAAS, Beijing)  
A method for determination of 180 by using CO2-H2O equilibrium teichnique is described in this paper.The tank CO2 gas was used as the equilibrium gas.A vacuum system for preparation of water sample for MS analysis is designed.A new formula for estimating δ18O value in water sample is proposed,and it has been used to calculate all data in our laboratory.The δ18O SMOW values of natural,mixed water and the 18O abundance in H218O have been obtained.The minimum amount of water used in this experiment is 3 ml.The minimum pressure of tank CO2 is 100 torr,and themaximum standard deviation is 0.15%.
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