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《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:

2023年第02期

Page:

256-265

Research Field:

基础地质与矿床地质

Publishing date:

Info

Title:

A Preparation Method of the TaF₅ Emitter Solution with High Ionization Efficiency and Low Sr Blank for the Sr Isotopic Measurement of Micro-samples

Author(s):

LI Wei-yong;  QI Ze-qiu;  HE Jian-feng;  ZHAO Jing-xin;  WANG Zhi-yi;  XIAO Ping;  HE Jun^*

(School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, Anhui, China)

Keywords:

Sr isotope;  TaF₅ emitter;  thermal ionization mass spectrometer;  low Sr blank;  high ionization efficiency;  radiogenic isotope;  isotopic geochronology;  standard rock powder

PACS:

P597⁺.1

DOI:

10.19814/j.jese.2022.06051

Abstract:

Thermal ionization mass spectrometers can provide the precondition for high-precision measurement of isotopic composition of geological samples, but it is normally difficult to obtain accurate isotopic composition of the samples having low elemental contents or very small volume or quantity, due to low ionization efficiency of elements. Therefore, efficiently improving the ionization efficiency is one of the key ways to measure isotopic composition of the micro-samples. The emitter can effectively decrease the ionization potential of elements and improve the ionization efficiency during the measurement using the thermal ionization mass spectrometer(TIMS), but unpurified emitter will inevitably introduce more blank and reduce the accuracy of measurement results. A preparation method to produce TaF₅ emitter solution for the Sr isotopic measurements on micro-samples was provided by the TIMS technique. This emitter solution is characterized by very low Sr blank and high efficiency to aid Sr ionization on the basis of the measurements on the standard Sr solution(NIST SRM 987)and the standard rock powders(BCR-2 and BHVO-2 basalts). The experimental results show that TaF₅ emitter solution after the purification has a very low Sr blank with a mean value of about 0.02 pg?μL^-1. Only 1-2 μL of the emitter solution used for each sample can effectively improve Sr ionization efficiency, and maintain high and stable signal intensity of Sr isotopes during the measurements. The ⁸⁷Sr/⁸⁶Sr values measured on the micro-samples of the standard Sr solution and standard rock powders fall in the ranges of their reference values, meeting requirements in the precision and accuracy for the measurement of Sr isotope for nanogram even sub-nanogram samples. This high-efficiency and low-blank TaF₅ emitter solution can apply to the measurements of Sr isotopic composition of low-content samples, ensuring more applications of the Sr isotope geochemistry.

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Last Update: 2023-05-20