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Mercury Isotopes (1):
Recent article
Mercury Isotopes
Journal of Physical Chemistry A: Molecules, Spectroscopy, Kinetics, Environment and General Theory (114)12 2010
Abstract
Photochemical reduction of Hg(II) by various low-molecular-weight organic compounds (LMWOC) was investigated to evaluate the effect of specific functional groups that are typically encountered in natural dissolved organic matters (DOM) on the photoreactivity and isotope fractionation of Hg. LMWOC wi...
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PMID: 20218588
PDF is available here.
PDF is available here.
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Journal of Physical Chemistry A: Molecules, Spectroscopy, Kinetics, Environment and General Theory (114)12 2010
Abstract
We investigated the abiotic reduction of inorganic Hg(II) by dissolved organic matter (DOM) and stannous(II) chloride (SnCl(2)) in the absence of light and quantified fractionation of Hg isotopes during these processes. The kinetics of reduction by DOM was characterized using multiple parallel pseud...
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PMID: 20192261
PDF is available here.
PDF is available here.
Abstract
The isotopic composition of mercury (Hg) was determined in cinnabar ore, mine-waste calcine (retorted ore), and leachates obtained from water leaching experiments of calcine from two large Hg mining districts in the U.S. This study is the first to report significant mass-dependent Hg isotopic fracti...
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PMID: 19848142
PDF is available here.
PDF is available here.
Abstract
We show that atmospheric Hg accumulated in lichens is characterized by NMF with negative delta199Hg and delta201Hg values (-0.3 to -1 per thousand), making the atmosphere and the aquatic environment complementary reservoirs regarding photoreduction and NMF of Hg isotopes. Because few other reactions...
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PMID: 19731659
PDF is available here.
PDF is available here.
Abstract
Although there is now a general consensus among mercury (Hg) biogeochemists that increased atmospheric inputs of inorganic Hg(II) to lakes and watersheds can result in increased methylmercury (MeHg) concentrations in fish, researchers still lack kinetic data describing the movement of Hg from the at...
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PMID: 19673292
PDF is available here.
PDF is available here.
Abstract
MeHg and inorganic Hg compounds were measured in aqueous media for isotope ratio analysis using aqueous phase derivatization, followed by purge-and-trap preconcentration. Compound-specific isotope ratio measurements were performed by gas chromatography interfaced to MC-ICP/MS. Several methods of cal...
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PMID: 18488203
PDF is available here.
PDF is available here.
Abstract
Isotope ratio measurements characterizing (202)Hg/(200)Hg in NIST SRM 3133 Mercury Standard Solution were undertaken by multicollector inductively coupled plasma mass spectrometry employing NIST SRM 997 Tl for mass bias correction by use of the slope and the intercept obtained from a natural logarit...
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PMID: 18784919
PDF is available here.
PDF is available here.
Abstract
Abstract
We investigate whether coal deposits within the United States, China, and Russia-Kazakhstan, which are three of the five greatest coal-producing regions, have diagnostic Hg isotopic fingerprints that can be used to discriminate among Hg sources. We also investigate the Hg isotopic composition of mod...
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PMID: 19068810
PDF is available here.
PDF is available here.
Environmental Pollution (154)1 2008
Abstract
These results suggest high concentrations of DOC inhibit bioavailability, while low concentrations may provide optimal conditions for algal uptake of Hg. However, variability of BCFs at low DOC indicates that DOC composition or other ligands may determine site-specific bioavailability of Hg....
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PMID: 18222023
PDF is available here.
PDF is available here.
Environmental Pollution (154)1 2008
Abstract
We added inorganic Hg enriched in a different stable isotope in each of two years, which allowed us to differentiate between Hg added in the first and second year. Although inorganic Hg and methylmercury (MeHg) continued to accumulate in sediments throughout the experiment, the availability of MeHg...
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PMID: 18272273
PDF is available here.
PDF is available here.
Abstract
We have obtained an external 2SD precision of 0.56 per thousand for delta (202)Hg that is more than 10 times smaller than the overall Hg stable isotope variation thus far observed in terrestrial samples. The measurement of species-specific Hg isotopic composition relative to SRM NIST-3133 has been v...
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PMID: 18407622
PDF is available here.
PDF is available here.
Environmental Pollution (153)2 2008
Abstract
We analyzed Hg species distribution patterns among ecosystem compartments in the Everglades at the landscape level in order to explore the implications of Hg distribution for Hg bioaccumulation and to investigate major biogeochemical processes that are pertinent to the observed Hg distribution patte...
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PMID: 17945404
PDF is available here.
PDF is available here.
Abstract
A new double-spiking approach, based on a multiple-spiking numerical methodology, has been developed and applied for the accurate quantification of inorganic mercury (IHg) and methylmercury (MeHg) by GC-ICPMS in different environmental matrices such as water, sediments and a wide range of biological...
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PMID: 17899032
PDF is available here.
PDF is available here.
Abstract
Abstract
The complex formation between mercury(II) and penicillamine (H(2)Pen = 3,3'-dimethyl cysteine) in alkaline aqueous solutions (pH approximately 2) has been investigated with extended X-ray absorption fine structure (EXAFS) and 199Hg NMR spectroscopy. By varying the penicillamine concentration (C(H(2)...
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PMID: 17940647
PDF is available here.
PDF is available here.
Abstract
We conducted a whole-ecosystem experiment, increasing the mercury load to a lake and its watershed by the addition of enriched stable mercury isotopes. The isotopes allowed us to distinguish between experimentally applied mercury and mercury already present in the ecosystem and to examine bioaccumul...
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PMID: 17901207
PDF is available here.
PDF is available here.
Journal of Physical Chemistry A: Molecules, Spectroscopy, Kinetics, Environment and General Theory (111)24 2007
Abstract
We note also that the Hg-O distance obtained in the neutron diffraction experiment is larger by approximately 0.1 A than that obtained by X-ray diffraction. This difference is consistent with a shift of the oxygen electron density toward the mercury cation due to the covalency of the Hg-O interactio...
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PMID: 17536793
PDF is available here.
PDF is available here.
Analyst (Cambridge UK) (132)6 2007
Abstract
Transport and collection characteristics were studied for gaseous elemental mercury (Hg(0)(g)) in natural gases using newly developed methodology based on amalgamation, isotope dilution with permeation tubes and inductively coupled plasma mass spectrometry. The study involved different Au-Pt collect...
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PMID: 17525816
PDF is available here.
PDF is available here.
Abstract
We investigated the isotopic fractionation of Hg by Hg(II) resistant (HgR) bacteria expressing the mercuric reductase (MerA) enzyme. The isotopic composition of both the reactant Hg(II) added to the growth medium and volatilized product (Hg(0)) was measured using cold vapor generation and multiple c...
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PMID: 17410780
PDF is available here.
PDF is available here.
Analytica Chimica Acta (583)1 2007
Abstract
In order to investigate trace mercury-containing proteins in maternal rat and their offspring, a method of enriched stable isotopic tracer (196Hg and 198Hg) combined with size-exclusion chromatography (SEC) coupled to inductively coupled plasma-isotope dilution mass spectrometry (ICP-IDMS) was devel...
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PMID: 17386530
PDF is available here.
PDF is available here.
Abstract
We have carried out a parallel study using (199)Hg NMR and (199m)Hg perturbed angular correlation (PAC) spectroscopy to characterize the distinct species that are generated under different pH conditions and peptide TRI L9C/Hg(II) ratios. These studies prove for the first time the formation of [Hg{(T...
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PMID: 17960740
PDF is available here.
PDF is available here.
Abstract
A stable isotope technique was used to trace the formation of methylmercury in lake water incubation assays at in situ conditions in five lakes across Canada. Methylation activity was only detected in the anoxic hypolimnia of lakes. The stable isotope was methylated at varying rates between lakes an...
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PMID: 16216310
PDF is available here.
PDF is available here.
Abstract
Our spike experiments suggest that some of the Hg(ll) in wet deposition retained by the forest canopy may be rapidly photoreduced to Hg(0) and re-emitted back to the atmosphere, while another portion may be retained by foliage at the end of the growing season, with some being deposited in litterfall...
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PMID: 16913124
PDF is available here.
PDF is available here.
Abstract
We estimate that approximately 6% of the isotope would be re-emitted in a year's time. During the experiment, dry deposition of elemental Hg from the atmosphere was measured with an average deposition rate of 0.2 +/- 0.1 ng m(-2) h(-1). Emission of ambient Hg from the soil was observed after soil we...
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PMID: 16295867
PDF is available here.
PDF is available here.
Abstract
We calculated energy spectra and investigated the amount of primary and scattered photons within various energy windows set on the x-rays photopeak. The energy resolution (ER) at 71 keV (the peak of the x-rays photopeak) was changed to 10%, 12%, 14% and 16%. The relationships between the energy wind...
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PMID: 16363618
PDF is available here.
PDF is available here.
Abstract
The solvation of the mercury(II) ion in solvents with different solvation properties, water, dimethylsulfoxide, N,N-dimethylthioformamide, and liquid ammonia, has been studied by means of (199)Hg NMR. The (199)Hg chemical shift shows a pronounced dependence on the coordination number of the mercury(...
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PMID: 16025553
PDF is available here.
PDF is available here.
Environmental Pollution (134)1 2005
Abstract
We measured the transfer of MeHg from fish carcasses to scavenging leeches in two lakes and in the laboratory. The results of a field experiment indicated that leeches were attracted to fish carcasses and that their Hg concentrations increased by as much as a factor of 5 during the time that Hg-rich...
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PMID: 15572220
PDF is available here.
PDF is available here.
Abstract
About 90% of the mercury found in the red blood cells was in the form of MeHg with small inter-individual variations, and part of the IHg found in the red blood cells could be attributed to demethylated MeHg. THg in plasma was associated with both IHg and MeHg, with large inter-individual variations...
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PMID: 16202128
PDF is available here.
PDF is available here.
Abstract
Extraction techniques commonly used to extract methylmercury or mercury species from various matrixes have been evaluated regarding their potential to transform inorganic mercury to methylmercury, or vice versa, during sample preparation steps by applying speciated isotope dilution mass spectrometry...
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PMID: 15228324
PDF is available here.
PDF is available here.
Abstract
The stable isotope composition of mercury (Hg) in a dated core from the anoxic zone of a saline, meromictic Arctic lake was found to vary as a complex function of the age and chemical composition of the sediment. Throughout the stratigraphic sequence, which spans the years 1899-1997, the ratios 198H...
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PMID: 15212254
PDF is available here.
PDF is available here.
Abstract
We report the results of a detailed study of surface relaxation of 199Hg nuclear spins in paraffin coated cells. From measurements of the magnetic field and temperature dependence of the spin relaxation rates we determine the correlation time for magnetic fluctuations and the surface adsorption ener...
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PMID: 15268277
PDF is available here.
PDF is available here.
Abstract
A rapid, accurate, sensitive, and simple method for simultaneous speciation analysis of mercury and tin in biological samples has been developed. Integrated simultaneous sample preparation for tin and mercury species includes open focused microwave extraction and derivatization via ethylation. Capil...
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PMID: 14632122
PDF is available here.
PDF is available here.
Molecular Pharmacology (63)3 2003
Abstract
Mercuric ions are highly reactive and form a variety of organic complexes or conjugates in vivo. The renal proximal tubule is a primary target for mercury uptake and toxicity, and circumstantial evidence implicates organic anion transporters in these processes. To test this hypothesis directly, the...
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PMID: 12606766
PDF is available here.
PDF is available here.
Inorganic Chemistry (41)9 2002
Abstract
The solution state coordination chemistry of Hg(ClO(4))(2) with tris[(2-(6-methylpyridyl))methyl]amine (TLA) was investigated in acetonitrile-d(3) by proton NMR. Although Hg(II) is a d(10) metal ion commonly associated with notoriously rapid exchange between coordination environments, as many as six...
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PMID: 11978122
PDF is available here.
PDF is available here.
Abstract
A method based on isotope dilution cold-vapor inductively coupled plasma mass spectrometry (ID-CV-ICPMS) has been developed for high-accuracy determinations of mercury in bituminous and sub-bituminous coals. A closed-system digestion process employing a Carius tube is used to completely oxidize the...
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PMID: 12033233
PDF is available here.
PDF is available here.
Biochimica et Biophysica Acta (1325)2 1997
Abstract
Methylmercury (CH3Hg(II)) interactions with multilamellar vesicles of dimyristoyl(DM)- and dipalmitoyl(DP)-phosphatidylcholine (PC), -phosphatidic acid (PA), -phosphatidylglycerol (PG), -phosphatidylserine (PS) and -phosphatidylethanolamine (PE) have been investigated from the metal viewpoint by sol...
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PMID: 9168150
PDF is available here.
PDF is available here.
Abstract
Time-dependent tissue distribution of mercury(Hg) was studied in a freshwater perch, Anabas testudineus which revealed that the liver and kidneys are the major sites of Hg retention. The role of reduced glutathione (GSH) in the clearance of Hg was also investigated to evaluate the ameliorative effec...
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PMID: 9099427
PDF is available here.
PDF is available here.
Abstract
We measured energy spectra around 201Hg X-ray region by a 201Tl line source with scattering materials and a gamma camera, and analyzed them to investigate the amount of scattered photons in 201Tl imaging window. Furthermore, Monte Carlo calculations were performed to distinguish primary photons from...
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PMID: 9095572
PDF is available here.
PDF is available here.
Abstract
Abstract
Abstract
Structural insights have been provided by mercury-199 nuclear magnetic resonance (NMR) into the metal receptor site of the MerR metalloregulatory protein alone and in a complex with the regulatory target, DNA. The one- and two-dimensional NMR data are consistent with a trigonal planar Hg-thiolate co...
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PMID: 7716541
PDF is available here.
PDF is available here.
Abstract
We describe a compartmental pharmacokinetic model for methyl mercury and its metabolite mercuric mercury in humans. A tracer dose of 203Hg-labeled methyl mercury was administered iv to seven healthy young adult male volunteers. Blood samples were obtained periodically and urine and feces were collec...
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PMID: 7940540
PDF is available here.
PDF is available here.
Abstract
A simple approach is discussed for studying the effect of quadrupolar nuclei on the magic-angle-spinning solid-state NMR lines of spin-1/2 nuclei in the limit of large quadrupole coupling constants. Equations are derived both for the isotropic shifts and the Pake-like powder patterns for any quadrup...
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PMID: 7834309
PDF is available here.
PDF is available here.
Abstract
N-acetylpenicillamine, 5 mmol/kg body weight increased biliary excretion of methyl mercury more than three fold. Upon simultaneous administration of the same dose of N-acetylpenicillamine and 2,5 mmol/kg body weight of S-methylcysteine biliary excretion of methyl mercury increased only 1.5 fold. In...
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PMID: 6496113
PDF is available here.
PDF is available here.
Abstract
In view of the problems posed by the diagnosis of intrarenal masses, the authors review 16 cases of patients with this pathology who have undergone renographic and gammagraphic studies. They obtain a high level of coincidence between the gammagraphic diagnosis and its subsequent surgical confirmatio...
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PMID: 742925
PDF is available here.
PDF is available here.
Origins of Life (7)3 1976
Abstract
Attention is called to the photodynamic and thermodynamic properties of Periodic Group IIb elements, most notably Hg, as they relate to ultra-violet sensitization in organic chemical reactions. The energy levels of 6(1) P1 and 6(3) P1 resonance states and the high vapor pressure ((greater than 10(-3...
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PMID: 1012707
PDF is available here.
PDF is available here.
Abstract
Abstract
The distribution and excretion of different body burdens of methylmercury (MeHg) have been investigated in the squirrel monkey. In monkeys given weekly 0.8 mg/kg doses, orally, of 203-MeHg, a linear correlation was observed between the concentrations of radioactive Hg in the blood and brain to as mu...
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PMID: 1137437
PDF is available here.
PDF is available here.
Abstract
Sixteen radiopharmaceuticals for brain tumor localization have been compared in a mouse brain tumor model. A rating system is presented for such intercomparison. The rusults indicate that 111-in-chloride injected at pH 1.5 has the most favorable biologic characterisTICS FOR BRAIN TUMOR IMAGING.
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PMID: 46273
PDF is available here.
PDF is available here.
Abstract
Abstract
Abstract
Almost all of the methylmercury (MM) in human blood is protein bound, primarily to sulfhydryl ligands. Sulfhydryl agents such as penicillamine, N-acetylpenicillamine, cysteine and N-acetyleysteine are capable of reversing the protein binding of MM when they are added to whole human blood. The magn...
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PMID: 1117415
PDF is available here.
PDF is available here.
Abstract
The distribution of 203Hg in Saccharomyces cerevisiae grown in the presence of mercuric chloride has been examined by physical and chemical fractionation procedures and autoradiography. The major fraction of the bound mercury is tightly bound to the wall. A significant quantity of mercury penetrates...
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PMID: 1089755
PDF is available here.
PDF is available here.
Abstract
Health Physics (28)1 1975
Abstract
Abstract
Abstract
Abstract