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Volume 33 Issue 1
Feb 2022
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Jin Li, Xiangkun Zhu, Suohan Tang. Assessment of Different Digestion Procedures for Mo Isotope Measurements of Black and Grey Shales Using the Double Spike Technique. Journal of Earth Science, 2022, 33(1): 76-81. doi: 10.1007/s12583-021-1520-1
Citation: Jin Li, Xiangkun Zhu, Suohan Tang. Assessment of Different Digestion Procedures for Mo Isotope Measurements of Black and Grey Shales Using the Double Spike Technique. Journal of Earth Science, 2022, 33(1): 76-81. doi: 10.1007/s12583-021-1520-1

Assessment of Different Digestion Procedures for Mo Isotope Measurements of Black and Grey Shales Using the Double Spike Technique

doi: 10.1007/s12583-021-1520-1
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  • Corresponding author: Xiangkun Zhu,
  • Received Date: 02 Feb 2021
  • Accepted Date: 26 Jul 2021
  • Publish Date: 28 Feb 2022
  • This study investigates the behavior of Mo and Mo isotopes (δ98Mo) in shales following leaching with HCl and HNO3 with the aim of simplifying the shale dissolution procedure. Up to 6% of the Mo was lost and the Mo isotopes were unaffected when shales were leached using 9 M HCl after ashing. Bulk sample digestion or leaching by 4 M or more concentrated HCl after ashing were all found to be acceptable and reliable approaches to the analysis of Mo isotopes in shales. After black shale (CAGS-BS) was leached with 2 M HCl, 1 M HCl, and 9 M HNO3, the Mo concentration ([Mo]) in the leachate was lower and δ98Mo was heavier than that obtained from bulk digestion. A Mo isotope mass-balance model showed that the δ98Mo in the residues was lighter than the δ98Mo from the bulk digestion of CAGS-BS and of crustal igneous rocks. No more Mo was lost, nor did Mo isotope fractionation, if the double spike was added before rather than after ashing and followed by bulk digestion or leaching with 9 M HCl. For efficiency, leaching using 4 M or more concentrated HCl after ashing is preferred for Mo isotope measurements.


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    通讯作者: 陈斌,
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      沈阳化工大学材料科学与工程学院 沈阳 110142

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