摘要
A new aproach to isotopic analysis of carbon,oxygen,sulfur and nitrogen in microsamples has been established.Samples were conventionally prepared by mixing microsamples to be analyzed with reference samples with known δ values in a proper proportion,and then analyzed for their stable isotopes as those at ordinary levels.According to the equilibrium relationships before and after mixing,the δvalues of unknown microsamples were calculated.The δ^15N of the atmosphere was estimated at zero by this approach,which is concordant with the internationally recommended value.
A new approach to isotopic analysis of carbon,oxygen,sulfur and nitrogen in microsamples has been established.Samples were conventionally prepared by mixing microsamples to be analyzed with reference samples with known δ values in a proper proportion,and then analyzed for their sta- ble isotopes as those at ordinary levels.According to the equilibrium relationships before and after mixing,the δ values of unknown microsamples were calculated.The δ ^(15)N of the atmosphere was estimated at zero by this approach,which is concordant with the internationally recommended value.
