Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1194545 | International Journal of Mass Spectrometry | 2007 | 7 Pages |
Abstract
Isotope ratios of very small Nd samples (0.1-5 ng) are measured by the total evaporation normalization (TEN) method. Samples as small as 0.5 ng can be measured with an external precision of 140 ppm by this method. The average 143Nd/144Nd ratio of the samples with the measured electric charge Q (143Nd) = 10-50 Ã 10â11 corresponds roughly to 0.5 ng JNdi-1, is 0.51214 ± 0.00007 (n = 7) and is coherent with the values obtained by conventional dynamic multi-collection thermal ionization mass spectrometric measurements. The precision of 0.5 ng Nd measurements is sufficient for the application of the 143Nd/144Nd ratio as a geochemical tracer. The precision of TEN measurements for samples smaller than 5 ng is superior to that of the conventional method.
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Shigeyuki Wakaki, Shin-Nosuke Shibata, Tsuyoshi Tanaka,