Low level mercury speciation in freshwaters by isotope dilution GC-ICP-MS
| Autor: | Vivien F. Taylor, R. Arthur Baker, Eric K. Miller, Brian P. Jackson |
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| Jazyk: | angličtina |
| Rok vydání: | 2009 |
| Předmět: |
MERCURE
Detection limit Isotope dilution method Uncertainty chemistry.chemical_element Fresh Water General Chemistry Mercury Isotope dilution Sensitivity and Specificity Article Gas Chromatography-Mass Spectrometry Mercury (element) chemistry.chemical_compound chemistry Isotopes Environmental chemistry Calibration Environmental Chemistry Gas chromatography Methylmercury Inductively coupled plasma mass spectrometry Water Pollutants Chemical |
| Popis: | Atmospheric deposition of anthropogenic Hg has led to increased Hg concentrations in many ecosystems. Modeling is an effective method for predicting the complex dynamics of Hg transport in watersheds. Such models require accurate concentrations of water column methylmercury, CH3Hg+, for input parameters, yet these concentrations are very difficult to measure precisely because they are so low. We developed a method for aqueous CH3Hg+ quantification in Lake Champlain, VT, where ambient CH3Hg+ concentrations are < 0.04 ng L(-1). The analysis utilized species-specific isotope dilution, purge and trap gas chromatography inductively coupled plasma mass spectrometry and provided instrument detection limits of about 0.3 fM (0.06 pg L(-1)) and method detection limits of 15 fM (0.003 ng L(-1)) for CH3Hg+, which are among the lowest reported. Artifactual methylation of inorganic Hg(2+) was shown to be minor, and the precision of the isotope dilution method was generally |
| Databáze: | OpenAIRE |
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