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Abstract <p>Triple quadrupole inductively coupled plasma mass spectrometry was utilized to determine Lu and Hf isotopic ratio in some geological samples. Mass interferences with different isotopes were studied using oxygen as a reaction gas in the triple quad mode. The examined samples were digested in 14 M HNO<sub>3</sub>, 28 M HF and 2 M HCl, Dowex 50-WX8 resin was used to separate lutetium (Lu) from hafnium (Hf). Thallium isotopic standard SRM 997 was used to correct the mass bias of the measured isotopes. The obtained fractions were analyzed using single quad mode without reaction gas. The results of analysis showed good agreement with the direct analysis using the reaction gas. The obtained results led to the age determination of the samples according to the Lu-Hf method of dating the obtained age was 446±117 million years. This technique is favored due to its relative simplicity and how quickly and easily samples can be digested chemically as a novel method to prepare samples for Lu-Hf isotopic analysis.</p>

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A Novel Analytical Method for Measuring Lu/Hf Isotopic Ratios for Dating by Inductively Coupled Triple-Quadrupole Plasma Mass Spectrometry after Their Chemical Separation from Geological Samples

  • 期刊论文

  • 发表日期：

    2025年6月1日

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  • A. M. Rashad,
  • R. A. Mohamed,
  • S. M. Elashry,
  • A. I. Helal,
  • H. M. Saleh

摘要

Abstract

Triple quadrupole inductively coupled plasma mass spectrometry was utilized to determine Lu and Hf isotopic ratio in some geological samples. Mass interferences with different isotopes were studied using oxygen as a reaction gas in the triple quad mode. The examined samples were digested in 14 M HNO3, 28 M HF and 2 M HCl, Dowex 50-WX8 resin was used to separate lutetium (Lu) from hafnium (Hf). Thallium isotopic standard SRM 997 was used to correct the mass bias of the measured isotopes. The obtained fractions were analyzed using single quad mode without reaction gas. The results of analysis showed good agreement with the direct analysis using the reaction gas. The obtained results led to the age determination of the samples according to the Lu-Hf method of dating the obtained age was 446±117 million years. This technique is favored due to its relative simplicity and how quickly and easily samples can be digested chemically as a novel method to prepare samples for Lu-Hf isotopic analysis.