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- Title
Isotopic and chemical characteristics of mercury in organs and tissues of fish in a mercury‐polluted lake: Evidence for fractionation of mercury isotopes by physiological processes.
- Authors
Jackson, Togwell A.
- Abstract
Abstract: Organs and tissues of whitefish and trout from mercury (Hg)‐polluted Lake Ontario were analyzed for Hg isotopes, methylmercury (CH3Hg+), and inorganic Hg to investigate possible mass‐dependent fractionation (MDF) and mass‐independent fractionation (MIF) of Hg isotopes by physiological processes of the fish. Isotope signatures of different body parts were defined by δ‐values of 198Hg/202Hg, 199Hg/202Hg, 200Hg/202Hg, and 201Hg/202Hg ratios and by Δ‐values representing effects of MIF on 199Hg/202Hg and 201Hg/202Hg ratios. The research yielded the following evidence for MDF and MIF, including MIF of isotopes with even as well as odd mass numbers, by metabolic activities: 1) anomalously low δ‐values for whitefish kidneys but not for trout kidneys; 2) widely varying differences between the δ‐values of different body parts of whitefish but practically uniform differences for those of trout; 3) different relationships between Δ199Hg and Δ201Hg for whitefish than for trout; 4) nonlinear correlation between δ198Hg and δ200Hg for whitefish but linear correlation for trout; 5) an inverse correlation between the δ199Hg values and CH3Hg+ concentrations of whitefish and trout; 6) an inverse correlation between the δ201Hg/δ199Hg and CH3Hg+/inorganic Hg ratios of trout kidneys and gills (and lipids of trout near the sources of pollution) but a positive correlation for muscle, liver, and gut; and 7) inverse correlations between Δ199Hg and the CH3Hg+/inorganic Hg ratio for trout liver, kidneys, and gut. <italic>Environ Toxicol Chem</italic> 2018;37:515–529. © 2017 SETAC
- Subjects
MERCURY isotopes; WHITEFISHES; METHYLMERCURY; MICROORGANISMS; ENVIRONMENTAL toxicology
- Publication
Environmental Toxicology & Chemistry, 2018, Vol 37, Issue 2, p515
- ISSN
0730-7268
- Publication type
Article
- DOI
10.1002/etc.3987