Validating the high-precision measurement of Mo isotopes at the 5 ng level using double spike MC-ICP-MS

Abstract

With recent advancements in analytical methods of Mo isotopes, the δ98/95Mo ratios of most geological and environmental samples can be determined. Still, it remains a challenge to obtain high-precision Mo...

Double Spike-Standard Addition Technique and Its Application in Measuring Isotopes

“…The δ 114/110 Cd values were 0.552 ± 0.013‰ (2SD, n = 5) for NIST 2711a and −0.351 ± 0.025‰ (2SD, n = 4) for JSd-2, and the δ 98/95 Mo values were −0.654 ± 0.039‰ (2SD, n = 6) for NOD-A-1and −0.030 ± 0.039‰ (2SD, n = 3) for BCR-2. These values are in good agreement with reported data ,,− and will be utilized to compare with other data in the following sections.…”

“…The other two solutions were prepared by purifying high-Mo natural samples (NOD-P-1 or SD1-5), which were mixed with DS before chemical separation. NOD-P-1 is a widely used manganese nodule reference material. , SD1-5 is a black shale from Enshi, Hubei Province, China. , …”

“…NOD-P-1 is a widely used manganese nodule reference material. 33,34 SD1-5 is a black shale from Enshi, Hubei Province, China. 35,36 Sample Preparation and Mass Spectrometry.…”

Density Functional Theory Calculations of Equilibrium Mo Isotope Fractionation Factors among MoOxS4–x2– Species in the Aqueous Phase by the ONIOM Method

“…The Mo isotope composition was initially expressed as δ 97 Mo = [( 97 Mo/ 95 Mo) sample /( 97 Mo/ 95 Mo) standard – 1]. , Therefore, the calculated α eq factors have been reported as 97/95 α eq . ,− With the development of the 97 Mo– 100 Mo double-spike analysis technique, the following measurements reported the Mo isotope composition as δ 98 Mo. ,,− The δ 97 Mo and δ 98 Mo values can be converted to each other by a geometric rule: δ 97 Mo ≈ 2/3 × δ 98 Mo and so do the 97/95 α and 98/95 α values. To be consistent with recent works, here we report the Mo isotope fractionation factor as 98/95 α , and all the 97/95 α values in the literature are converted to 98/95 α values unless specified.…”

High-precision double-spike Sn isotope analysis of geological materials by MC-ICP-MS

“…To correct for potential deviations from the exponential law and shi of the gains for Faraday collectors during the measurements, 42,44 a bracketing standard was used to normalize isotopic values aer a double spike inversion of each sample. 44,[72][73][74][75][76][77] Therefore, all the data are reported as the deviation of d 122/118 Sn of a sample relative to the average d 122/118 Sn of two bracketing spiked NIST 3161a, similar to Wang et al 44 The geometrical method was also used for comparison using MATLAB @ , and consistent results were found, for which the details are provided in the ESI A. †…”