摘要
以待测微量样品与δ值已知的标准样按一定比例相互混合,用常规方法制样,将低于质谱常量分析气样的碳、氮、氧、硫稳定同位素按常量分析。根据混合前后的平衡关系,求出待测微量样品的δ值。同时,分析测得大气氮的δ15N值为零,与国际公认结论完全一致。
If we mix the microsample to be determined and the standard sample with known δ value, we can deduce the calculation formulae for mixing of different ratios or equal ratio according to equilibrium relationship before and after the mixing:
Based on this principle, the author advances a new stable isotope analytical method for mixed model of microsamples (carbon, nitrogen, oxygen and sulfur). Experiments show that if only the highly pure microsample is mixed with the standard sample and the operation procedure is correct, the δ value obtained will meet the requirement of accuracy. This suggests the feasibility of this method. The present paper reports for the first time in China the δ^(15)N value of atmospheric nitrogen, which is entirely consistant with the internationally established conclusion that δ^(15)N value of the atmospheric nitrogen is zero. Finally, some problems worth further consideration are pointed out.
出处
《岩石矿物学杂志》
CAS
CSCD
1990年第3期275-282,共8页
Acta Petrologica et Mineralogica
关键词
微量样品
稳定同位素
混合模式
Microsample
stable isotope
mixed model
feasibility
