Rapid pre-concentration of mercury in solids and water for isotopic analysis

Analytica Chimica Acta
By: , and 

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Abstract

The precise quantification of mercury (Hg) stable isotope compositions in low concentration or dilute samples poses analytical challenges due to Hg mass limitations. Common Hg pre-concentration procedures require extended processing times, making rapid Hg stable isotope measurements challenging. Here we present a modified pre-concentration method that combines commonly used Hg reduction and gold trap amalgamation followed by semi-rapid thermal desorption (less than 1 h) and chemical trapping. This custom designed system was demonstrated to perform adequately on multiple trapping matrices including a new bromine monochloride (BrCl) wet oxidant trap (40% 3HNO3:BrCl), capable of trapping consistently in 2 mL volume over a wide range of Hg masses (5–200 ng). The procedure was also shown to work effectively on natural matrices, waters and sediments, producing comparable isotope results to the direct digestion analyses. Here, we present a method that can effectively triple sample throughput in comparison to traditional procedures, and also access lower concentration matrices without compromising the accuracy or precision of Hg isotope measurements.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Rapid pre-concentration of mercury in solids and water for isotopic analysis
Series title Analytica Chimica Acta
DOI 10.1016/j.aca.2018.12.026
Volume 1054
Year Published 2019
Language English
Publisher Elsevier
Contributing office(s) Upper Midwest Water Science Center
Description 9 p.
First page 95
Last page 103