scholarly journals Effects of anoxia and sulfide on concentrations of total and methyl mercury in sediment and water in two Hg-polluted lakes

2001 ◽  
Vol 58 (3) ◽  
pp. 506-517
Author(s):  
Olof Regnell ◽  
Tommy Hammar ◽  
Anders Helgée ◽  
Bo Troedsson
Keyword(s):  
Surface Sediment ◽  
Methyl Mercury ◽  
Manganese Oxides ◽  
Cellulose Fiber ◽  
Concomitant Decrease ◽  
Shallow Site ◽  
Fe And Mn ◽  
Total Hg ◽  
Deep Site

Between May and December 1996, monthly samples of surface sediment (0–1 cm), settling matter, and water were taken at a shallow site and a deep site in each of two consecutive Hg-polluted riverine lakes. In the upper lake, the sediment was polluted also with cellulose fiber. Both hypolimnia turned anoxic, but sulfide was detected only in the upper lake. When sulfide appeared, hypolimnetic methyl mercury (MeHg) increased and reached 47 pM (9.4 ng·L–1), whereas MeHg in the sediment below decreased. The increase in hypolimnetic inorganic Hg (IHg = total Hg – MeHg), which reached a peak of 40 pM (8.0 ng·L–1), was slower, possibly because mobilized IHg was methylated. In the lower lake, hypolimnetic MeHg and IHg increased less dramatically during summer stratification, reaching only 5 and 24 pM (1.0 and 4.8 ng·L–1), respectively. There was no detectable concomitant decrease in sediment MeHg. In both lakes, MeHg appeared to increase simultaneously with total Fe and Mn in the hypolimnion, as did IHg in the lower lake. Our observations suggest that the presence of hydrous ferric and manganese oxides decreased the mobility of Hg in both lakes but increased MeHg production in the upper lake.

scholarly journals Linking Cellulose Fiber Sediment Methyl Mercury Levels to Organic Matter Decay and Major Element Composition

AMBIO ◽  
2014 ◽  
Vol 43 (7) ◽  
pp. 878-890 ◽  
Author(s):  
Olof Regnell ◽  
Mark Elert ◽  
Lars Olof Höglund ◽  
Anna Helena Falk ◽  
Anders Svensson
Keyword(s):  
Organic Matter ◽  
Methyl Mercury ◽  
Major Element ◽  
Cellulose Fiber ◽  
Element Composition ◽  
Major Element Composition

Relationship of Sediment Redox Conditions to Methyl Mercury in Surface Sediment of Louisiana Lakes

2004 ◽  
Vol 39 (8) ◽  
pp. 1925-1933 ◽  
Author(s):  
R. D. DeLaune ◽  
A. Jugsujinda ◽  
I. Devai ◽  
W. H. Patrick
Keyword(s):  
Surface Sediment ◽  
Methyl Mercury ◽  
Redox Conditions ◽  
Relationship Of

Dual-functional catalytic materials: Magnetically hollow porous Ni-manganese oxides microspheres/cotton cellulose fiber

2017 ◽  
Vol 77 ◽  
pp. 311-320 ◽  
Author(s):  
Danfeng Zhang ◽  
Guozhen Zhang ◽  
Qiong Wang ◽  
Lei Zhang
Keyword(s):  
Manganese Oxides ◽  
Cellulose Fiber ◽  
Cotton Cellulose ◽  
Catalytic Materials ◽  
Dual Functional

Causative Mechanism of the Continental Margin Polymetallic Nodules from the South China Sea and its Resource Effects

2012 ◽  
Vol 524-527 ◽  
pp. 408-412
Author(s):  
Zhen Guo Zhang ◽  
Chang Shui Liu ◽  
Lian Feng Gao ◽  
Ying Zhang ◽  
Guo Yuan Shi ◽  
...  
Keyword(s):  
Rare Earth ◽  
South China Sea ◽  
Rare Earth Elements ◽  
Continental Margin ◽  
South China ◽  
Manganese Oxides ◽  
Mineral Resources ◽  
China Sea ◽  
Polymetallic Nodules ◽  
Fe And Mn

Polymetallic nodules are one of the most important sedimentary mineral resources in the ocean, in which iron, manganese, copper, cobalt, nickel and other metals are rich, and rare earth elements are rich, too. The samples are collected from the northwest continental margin of South China Sea (SCS). Their model show the similar appearance to the oceanic nodules which collected from the Pacific and Indian Ocean. They are big, regular shape and clear layers. But their geochemical characteristics show distinct difference with oceanic nodules.The samples formed by multiple millimeter-thick layers of Fe and Mn oxyhydroxides surrounding the nucleus composed of plastic marl and sediment. Massive, laminated, detrital and mottled to dendritic textural features were developed by the Fe and Mn oxyhydroxide layers.Based on the detailed study of the geochemistry and growth rate, the nodules may represent new-type ones which grow fastly in high sediment rates environment from the northwest continental margin of the SCS. The reason of the fast growth may be affected by the environmental fluctuations and the change of terrigenous sediments. Elements correlation of Mn-Fe-(Cu+Ni) suggests that the origin of the sample may be of hydrogenic. It may be show that these nodules are dominative of the special environment of the marginal sea which includes the geographical condition and the oceanic environmental factors. The average content of Rare Earth Elements (REEs) in these samples are much higher than those recorded in Earth’ crust and sedimentary rocks. The enrichment of rare earth elements is controlled by iron and manganese oxides and clay minerals in nodules, which could absorb rare earth elements from seawater and terrigenous sediment. Ce elements are highly enriched, making polymetallic nodules become the first used rare earth elements in oceanic mineral development.

Relationships between total mercury in sediments and methyl mercury in the freshwater gastropod prosobranch Bithynia tentaculata in the St. Lawrence River, Quebec

2000 ◽  
Vol 57 (S1) ◽  
pp. 164-173 ◽  
Author(s):  
JC Désy ◽  
J -F Archambault ◽  
B Pinel-Alloul ◽  
J Hubert ◽  
P GC Campbell
Keyword(s):  
Methyl Mercury ◽  
Linear Models ◽  
Dry Weight ◽  
Gut Contents ◽  
Freshwater Gastropod ◽  
Bithynia Tentaculata ◽  
Total Hg ◽  
Highly Correlated ◽  
The Relationship ◽  
St Lawrence River

Total Hg concentrations in sediment and methyl mercury (MeHg) levels in the gastropod species Bithynia tentaculata were evaluated at 21 stations in the fluvial corridor of the St. Lawrence River (Quebec, Canada). In the sediments (n = 21), total Hg concentrations ranged from 34 to 2790 ng·g dry weight-1. In the gastropods, MeHg concentrations varied from 15 to 290 ng·g dry weight-1 in undepurated gastropods (n = 20) and from 41 to 420 ng·g dry weight-1 in depurated gastropods (n = 13; without gut contents). The southern sector of Lake St. Louis, located near the Îles-de-la-Paix, had significantly higher Hg concentrations than any other sectors under study, both for total Hg in the sediments and MeHg in the gastropods. We established linear models to describe the relationships between Hg contamination in sediments and molluscs for the fluvial corridor of the St. Lawrence River and for the Lake St. Louis sector. Total Hg in sediments and MeHg in gastropods were highly correlated for all pooled stations (r = 0.83), and the relationship was even stronger for the Lake St. Louis stations (r = 0.92). Our study suggests that the gastropod B. tentaculata is a promising biomonitor species for assessing Hg contamination in the fluvial corridor and lakes of the St. Lawrence River.

scholarly journals Bait-attending amphipods of the Tonga Trench and depth-stratified population structure in the scavenging amphipod Hirondellea dubia Dahl, 1959

PeerJ ◽  
2018 ◽  
Vol 6 ◽  
pp. e5994 ◽  
Author(s):  
James P.A. Wilson ◽  
Kareen E. Schnabel ◽  
Ashley A. Rowden ◽  
Rachael A. Peart ◽  
Hiroshi Kitazato ◽  
...  
Keyword(s):  
Population Structure ◽  
Life Stage ◽  
Previous Suggestion ◽  
Bathymetric Range ◽  
Baited Traps ◽  
Shallow Site ◽  
New Hebrides ◽  
Deep Site ◽  
A Site ◽  
First Time

Background The hadal zone encompasses the deepest parts of the world’s ocean trenches from depths of ∼6,000–11,000 m. The communities observed at these depths are dominated by scavenging amphipods that rapidly intercept and consume carrion as it falls to the deepest parts of the trenches. New samples collected in the Tonga Trench provide an opportunity to compare the amphipod assemblages and the population structure of a dominant species, Hirondellea dubia Dahl, 1959, between trenches and with earlier data presented for the Tonga Trench, and other trenches in the South Pacific. Methods Over 3,600 individual scavenging amphipods across 10 species were collected in seven baited traps at two sites; in the Horizon Deep site, the deepest part of the Tonga Trench (10,800 m) and a site directly up-slope at the trench edge (6,250 m). The composition of the bait-attending amphipods is described and a morphometric analysis of H. dubia examines the bathymetric distribution of the different life stages encountered. Results The amphipod assemblage was more diverse than previously reported, seven species were recorded for the first time from the Tonga Trench. The species diversity was highest at the shallower depth, with H. dubia the only species captured at the deepest site. At the same time, the abundance of amphipods collected at 10,800 m was around sevenfold higher than at the shallower site. H. dubia showed clear ontogenetic vertical structuring, with juveniles dominant at the shallow site and adults dominant at the deep site. The amphipods of the deeper site were always larger at comparable life stage. Discussion The numbers of species encountered in the Tonga Trench is less than reported from the New Hebrides and Kermadec trenches, and six species encountered are shared across trenches. These findings support the previous suggestion that the fauna of the New Hebrides, Tonga and Kermadec Trenches may represent a single biogeographic province. The ontogenetic shift in H. dubia between the two Tonga Trench sites supports the hypothesis of interspecific competition at the shallower bathymetric range of the species, and the presence of competitive physiological advantages that allow the adults at the trench axis to exploit the more labile organic material that reaches the bottom of the trench.

scholarly journals Why the English–Wabigoon river system is still polluted by mercury 57 years after its contamination

FACETS ◽  
2021 ◽  
Vol 6 ◽  
pp. 2002-2027
Author(s):  
John W.M. Rudd ◽  
Carol A. Kelly ◽  
Patricia Sellers ◽  
Robert J. Flett ◽  
Bruce E. Townsend
Keyword(s):  
Surface Sediment ◽  
Methyl Mercury ◽  
Total Mercury ◽  
Inorganic Mercury ◽  
River System ◽  
Lake Surface ◽  
Riverbank Erosion ◽  
Plant Site ◽  
High Mercury ◽  
Mercury Production

Between 1962 and 1969, 10 tonnes of mercury were discharged from a chlor-alkali plant in Dryden, Ontario, to the English–Wabigoon River. Present-day fish mercury concentrations are amongst the highest recorded in Canada. In 2017, the Grassy Narrows Science Team found no evidence of ongoing discharges from the plant site to the river water, even though large quantities of mercury remain at the site. Instead, our data suggest that ongoing erosion of high mercury particles by the river, as it meanders through contaminated floodplains, is responsible for present-day transport of mercury to Clay Lake and to Ball Lake, located 154 km downstream. In Clay Lake, surface sediment total mercury concentrations and inflow water concentrations are still about 15 times above background (86 km downstream), and in Ball Lake mercury concentrations in sediments appeared to be still increasing. The remobilization of legacy inorganic mercury from riverbank erosion between Dryden and Clay Lake stimulates methyl mercury production there, in Clay Lake, and in Ball Lake. The large quantities of methyl mercury produced between Dryden and Clay Lake are mostly dissolved in water and are swept downstream, elevating concentrations in water and biota throughout the system. Several options for remediating the ongoing contamination are discussed.

Mercury concentrations in invertebrates from Mid-Atlantic Ridge hydrothermal vent fields

2001 ◽  
Vol 81 (6) ◽  
pp. 913-915 ◽  
Author(s):  
I. Martins ◽  
V. Costa ◽  
F. Porteiro ◽  
A. Cravo ◽  
R.S. Santos
Keyword(s):  
Hydrothermal Vent ◽  
Methyl Mercury ◽  
Hydrothermal Vents ◽  
Lucky Strike ◽  
Rimicaris Exoculata ◽  
Coastal Species ◽  
Low Concentrations ◽  
Mid Atlantic Ridge ◽  
Total Hg ◽  
Menez Gwen

Mercury determinations were carried out in mussels (Bathymodiolus azoricus) from three Mid-Atlantic Ridge hydrothermal vents (Lucky Strike, Menez Gwen and Rainbow) and shrimps (Rimicaris exoculata and Mirocaris fortunata) from Rainbow. Among the three hydrothermal vents, mussels of Menez Gwen show the highest levels of total Hg and comparing mussels and shrimps from Rainbow the former show more Hg than shrimps. Mussels from different hydrothermal vents are exposed to different kinds of environment which may result in distinct bioaccumulation processes. Detoxification processes in shrimps are related to the low concentrations found. When compared with coastal species from unpolluted sites, mussels show higher concentrations of total Hg and shrimps lower levels. The methyl-mercury concentrations found were very low, not exceeding the detection limit of the technique.

scholarly journals Coupling of methyl and total mercury in a minerotrophic peat bog in southeastern Sweden

2004 ◽  
Vol 61 (10) ◽  
pp. 2014-2023 ◽  
Author(s):  
O Regnell ◽  
T Hammar
Keyword(s):  
Organic Matter ◽  
Annual Cycle ◽  
Methyl Mercury ◽  
Total Mercury ◽  
Bulk Water ◽  
Peat Bog ◽  
Runoff Water ◽  
Discharge Water ◽  
Order Of Magnitude ◽  
Total Hg

During most of an annual cycle, we studied the temporal variation of total mercury (HgT) and methyl mercury (MeHg) in unfiltered and filtered (0.45 µ) peat water from a minerotrophic peat bog in southeastern Sweden. MeHg in bulk water ([MeHgT]) and total Hg in filtered water in discharge water from the peat bog ([HgD]) were an order of magnitude higher than in upland runoff water entering the peat bog. At the discharge end, peat-water [HgD] and [MeHgD] ranged from 8 to 54 pmol·L–1 and from 1 to 32 pmol·L–1, respectively. Whereas the variation of [MeHgT] was explained by changes in [MeHgD], the variation of inorganic HgT [IHgT] = [HgT] – [MeHgT] was explained by changes in particle-bound IHg [IHgP] = [IHgT] – [IHgD]. Filterable organic matter and sulfide in the water both correlated poorly with [HgD]. Neither did the amount of HgT in precipitation and upland runoff water correlate well with the estimated discharge of HgD from the peat bog. However, there was a strong correlation between [HgD] and [MeHgT] in the peat water (r = 0.96). Furthermore, a significant fraction of HgD was MeHg (mean 28%; range 8–60%). These results suggest that methylation increased the mobility of Hg.

Accumulation of total mercury and methyl mercury in insect larvae of hydroelectric reservoirs

1997 ◽  
Vol 54 (4) ◽  
pp. 832-841 ◽  
Author(s):  
A Tremblay ◽  
M Lucotte
Keyword(s):  
Methyl Mercury ◽  
Total Mercury ◽  
Dry Weight ◽  
Insect Larvae ◽  
Flooded Soils ◽  
Hydroelectric Reservoirs ◽  
Natural Lakes ◽  
Suspended Particulate ◽  
Total Variability ◽  
Total Hg

Mean total mercury (Hg) and methyl mercury (MeHg) concentrations in insect larvae from hydrolelectric reservoirs were 3-5 times (up to 10 times) higher than in their counterparts from natural lakes. Taxonomic differences, which may be related to feeding behavior, and substrate type (lake sediment or flooded soils) together explained a large part of the total variability of total Hg (r2 = 0.64) and MeHg (r2 = 0.79) concentrations in insects. MeHg concentrations in flooded soils increased from 0.3-2 ng Hg cdot g dry weight-1 after 1-2 years of flooding to 15-2 ng Hg cdot g dry weight-1 after 16 years of impoundment. Total Hg and MeHg concentrations in insect larvae followed a similar pattern, but only weak correlations of both total Hg and MeHg concentrations were found between flooded soils and insect larvae, suggesting that factors other than MeHg content of flooded soils also affect the accumulation of these compounds in insects. Our results indicate that suspended particulate matter eroded from flooded soils by wave and ice action and bacterial activity enhanced by the release of labile carbon and nutrients from the flooded soils may indirectly transfer MeHg from flooded soils to insect larvae.

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