Rapid pre-concentration of mercury in solids and water for isotopic analysis
| Autor: | Christopher L. Babiarz, David P. Krabbenhoft, John F. DeWild, Ryan F. Lepak, Michael T. Tate, Sarah E. Janssen, James P. Hurley, Jacob M. Ogorek |
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| Rok vydání: | 2018 |
| Předmět: |
Isotope
Stable isotope ratio 010401 analytical chemistry Analytical chemistry Thermal desorption chemistry.chemical_element 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Biochemistry 0104 chemical sciences Analytical Chemistry Mercury (element) chemistry.chemical_compound Bromine monochloride chemistry Desorption Environmental Chemistry 0210 nano-technology Inductively coupled plasma mass spectrometry Spectroscopy Isotope analysis |
| Zdroj: | Analytica chimica acta. 1054 |
| ISSN: | 1873-4324 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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