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

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Determination of Picomolar Titanium in Seawater by Isotope Dilution Multicollector Inductively Coupled Plasma Mass Spectrometry after Mg(OH)2 Coprecipitation
Analytical Chemistry ( IF 6.7 ) Pub Date : 2021-09-21 , DOI: 10.1021/acs.analchem.0c04381
Sichao Feng ₁ , Jingfeng Wu ₁ , Gedun Chen ₁

Affiliation

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)₂ coprecipitation to concentrate Ti from seawater, and uses a new ⁴⁹Ti–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^–1 that 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.

中文翻译：

Mg(OH)2 共沉淀后同位素稀释多接收器电感耦合等离子体质谱法测定海水中的皮摩尔钛

开发了一种新的同位素稀释电感耦合等离子体质谱 (ICPMS) 方法来确定海水中钛 (Ti) 的皮摩尔浓度。该方法采用 Mg(OH) ₂共沉淀法从海水中浓缩 Ti，并使用新的⁴⁹ Ti– ⁴⁷ Ti 同位素稀释法来消除从海水 Ca 中分离 Ti 的需要，从而通过高分辨率多接收器进行等压无干扰分析ICPMS。该方法使用 1.8 mL 海水样品，检测限为 1.6 pmol L ^–1这主要是由样品制备过程中的钛污染决定的，而不是由 ICPMS 灵敏度、仪器钛背景或同量异位素干扰决定的。使用这种方法测量了百慕大附近马尾藻海中溶解钛的海洋学一致的垂直剖面。

更新日期：2021-10-06

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