5:15 PM - 6:30 PM
[MIS18-P07] Tellurium Stable Isotope Compositions in Tellurium Standard Regents
Keywords:Tellurium, Stable Isotope, Fe-Mn Crusts
We used a multiple collector ICP-MS (NEPTUNE, Thermo Scientific) at JAMSTEC equipped with a desolvating nebulizer sample solution introduction system (Aridus II, Cetac). Mass discrimination in the instrument was corrected for by the double spike method using the 125Te-128Te double spike. The repeatability of our in-house standard (Kanto Chemical) was 0.2‰ (2σ, n = 25) for 130Te/125Te ratio using 11 ng of Te in one measurement run. The Te standard solutions supplied from Kanto Chemical (#40856-1B), Alfa Aesar (#44632), and Sigma-Aldrich (#92027) and the Te lump (99.9999%; Alfa Aesar, #10758) were analyzed for comparisons. The result showed that the 130Te/125Te ratio of the Sigma-Aldrich solution was identical with that of the Kanto Chemical solution within the analytical uncertainty. The 130Te/125Te ratio of the Alfa Aesar solution was 1.2‰ higher than that of the Kanto Chemical solution. The isotope composition of the Te lump was identical with that of the Alfa Aesar standard solution within errors. These results indicate that the Te isotope compositions of the source materials differed or isotope fractionation differed in their manufacturing process. The reported values of the Te stable isotope compositions from different laboratories may differ from each other in the range of ~1‰. Therefore, it is required to prepare the certified standard solution and carry out inter-laboratory calibration for wide geochemical application of Te isotopes.