【摘要】 本文叙述用CO₂-H₂O平衡法制样测定水样的氧同位素组成。以钢瓶CO₂为平衡气体,建立了CO₂-H₂O平衡法的各个程序,并设计了供质谱分析用的真空制样系统,提出了计算水样δ¹⁸O SMOW值的新公式。用该系统和方法测定了天然水和配制水的δ¹⁸ SMOW值及重氧水的¹⁸O丰度。最小用水量为3ml,最低CO₂充样压力为100乇,制样和质谱分析的标准偏差在0.15‰以内。更多还原

【Abstract】 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%.更多还原