Measurement of femtogram quantities of protactinium in silicate rock samples by multicollector inductively coupled plasma mass spectrometry

Analytical Chemistry
Marcel RegelousChris J Hawkesworth

Abstract

We describe a new method for the chemical separation and analysis of Pa in silicate rock samples by isotope dilution. Our new technique has the following advantages over previous methods: (a) The initial separation of Pa from the rock matrix is carried out using anionic exchange resin and HCl-HF mixtures, avoiding the need to remove F(-) quantitatively from the sample solution prior to this step, (b) Efficient ionization of Pa is achieved using a multicollector inductively coupled plasma mass spectrometer, so that smaller sample sizes and shorter measurement times are required, compared to previous methods using thermal ionization mass spectrometry or alpha spectrometry. (c) Plasma ionization requires less efficient separation of the high field strength elements from Pa, thus reducing reagent volumes, blanks, and sample preparation times. Instrumental mass fractionation can be corrected for using admixed U of known isotopic composition. Using this method, Pa concentrations can be measured to a precision of approximately 0.5% and an accuracy of approximately 1% using only a few tens of femtograms of Pa.

Citations

Apr 1, 2014·Journal of Environmental Radioactivity·Andrew W KnightMichael K Schultz
Mar 13, 2018·Dalton Transactions : an International Journal of Inorganic Chemistry·Philip D HopkinsMichael E Fassbender
Jan 1, 2019·Journal of Radioanalytical and Nuclear Chemistry·Richard M EssexLeticia Pibida
Jun 15, 2005·Analytical Chemistry·Michael E LipschutzJohn M Hanchar
Dec 20, 2017·Analytical Chemistry·Finn SüfkeSteffen Happel
Oct 16, 2021·Scientific Reports·Thomas A RongeRalf Tiedemann

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