【摘要】 发展了氢同位素分析新方法———石墨还原法 ,其分析精度达到 1 .5‰ ,优于常规的金属还原法。通过多次改进 ,设计了简单而可靠的氢气制备系统及反应管。经反复试验 ,确定了石墨还原法的最佳反应条件为反应时间 1 0min ,反应温度 1 0 5 0℃。将石墨还原法与传统的金属锌还原法进行了对比实验 ,两种方法对多个水样的测量结果保持在误差范围内 ,进一步确立了石墨还原法的可靠性更多还原

【Abstract】 A new sample preparation method with graphite reduction for hydrogen isotope analysis in natural water is developed. A system with simple and reliable hydrogen generator and reaction vessel was designed. The experimental results show that the optimized reaction time and temperature are 10 minutes and 1?050℃ respectively. The comparation of this method with zinc reduction method was made by hydrigen isotope analysis in water samples.The results from two methods are in agreement. The new method gives a precision of 1.5 ‰ ( σ ), which is better than commonly used zinc reduction method (2‰, σ ). The short reaction time (10 min) of the new method suggests a very high efficiency and the simplified reaction vessel allows a wide application.更多还原