Determination of Picomolar Titanium in Seawater by Isotope Dilution Multicollector Inductively Coupled Plasma Mass Spectrometry after Mg(OH)2Coprecipitation

Sichao Feng, Jingfeng Wu, Gedun Chen

Research output: Contribution to journalArticlepeer-review

Abstract

A new isotope dilution inductively coupled plasma mass spectrometry (ICPMS) method is developed to determine picomolar concentrations of titanium (Ti) in seawater. The method applies Mg(OH)2coprecipitation to concentrate Ti from seawater, and uses a new49Ti-47Ti isotope dilution to eliminate the need for separating Ti from seawater Ca, resulting in an isobaric interference-free analysis by high-resolution multicollector ICPMS. The method uses a 1.8 mL seawater sample with a detection limit of 1.6 pmol L-1that is determined mainly by Ti contamination during sample preparation rather than by ICPMS sensitivity, instrumental Ti background, or isobaric interferences. An oceanographically consistent vertical profile of dissolved Ti in the Sargasso Sea near Bermuda is measured with this method.

Original languageEnglish (US)
Pages (from-to)13118-13125
Number of pages8
JournalAnalytical Chemistry
Volume93
Issue number39
DOIs
StatePublished - Oct 5 2021

ASJC Scopus subject areas

  • Analytical Chemistry

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