5:15 PM - 6:45 PM
[HTT16-P15] Nd isotope analysis of nanogram level samples with 1013Ω resistor
Keywords:isotope, Neodimium, nanogram
Neodymium (Nd) is one of the rare earth elements (REEs) that is widely distributed in the earth's crust, albeit in small amounts. The radiogenic 143Nd/144Nd isotope ratio has been widely used in the field of geology to determine the origin and age of rocks. On the other hand, in studies such as biogeochemistry and ocean circulation, it has come to be used in many researches as a tracer of material circulation. However, the amount of neodymium contained in an environmental sample is extremely small, excluding rocks and mineral. Since neodymium is not a biophile element, it is basically not taken and used in the body of biological samples. Furthermore, its concentration is low in seawater and river water, which have low solubility, and a large amount of sample is required to measure the neodymium isotope ratio. Therefore, in this study, I am investigating the isotope ratio measurement of nanogram level Nd samples using TIMS and MC-ICP-MS with 1013Ω amplifier at RIHN.
At the 13st symposium of Isotope Environmental Studies (December 2023 at RIHN), I reported the results using TIMS (Triton XT) with a 1013Ω amplifier. It was reported that the signal intensity of 144Nd needs at least 100 mV or more for accurate measurement, which requires at least 5 ng of Nd. I also tested using only nitric acid or phosphoric acid when loading the sample onto the filament, but there was no significant difference between the two.
This time, I will report on the results of TIMS using a porous ion emitter made of platinum and rhenium powder with single filament method. In experiments using MC-ICP-MS (Neoma), it was found that measured values varied depending on the conditions such as sample- and skimmer-cone combination, oxide production ratio, and desolvating machine condition. I will also introduce measurement comparisons between the Neptune and the Neoma.
At the 13st symposium of Isotope Environmental Studies (December 2023 at RIHN), I reported the results using TIMS (Triton XT) with a 1013Ω amplifier. It was reported that the signal intensity of 144Nd needs at least 100 mV or more for accurate measurement, which requires at least 5 ng of Nd. I also tested using only nitric acid or phosphoric acid when loading the sample onto the filament, but there was no significant difference between the two.
This time, I will report on the results of TIMS using a porous ion emitter made of platinum and rhenium powder with single filament method. In experiments using MC-ICP-MS (Neoma), it was found that measured values varied depending on the conditions such as sample- and skimmer-cone combination, oxide production ratio, and desolvating machine condition. I will also introduce measurement comparisons between the Neptune and the Neoma.