Selected element concentrations in the post-glacial sediments of Thunder Bay, Lake Superior: distribution and methods of analyses

1977 ◽  
Vol 14 (5) ◽  
pp. 1054-1061 ◽  
Author(s):  
John S. Mothersill
Keyword(s):  
Organic Matter ◽  
Reliable Method ◽  
Interstitial Water ◽  
Lake Superior ◽  
Sedimentary Sequence ◽  
Aqua Regia ◽  
Glacial Sediments ◽  
Element Concentrations ◽  
Thunder Bay ◽  
Fe And Mn

Aqua regia digestion is a reliable method of extracting elements present in sediments from adsorbed positions, from solution in the interstitial water, and from precipitated oxides, hydroxides, and sulphides. The aqua regia method, when used in combination with the HF–HNO3–HClO4 method for total element extraction from the sediments, provides valuable information on the relative amounts of Fe, Mn, Ni, Cu, Co, Cr, and Zn which are able to migrate in the upper part of the sedimentary sequence. The distribution of Fe and Mn are strongly controlled by pH and Eh. Ni, Cu, Ci, Cr, and Zn are controlled by adsorption to Fe hydroxides, organic matter, and MnO2 as well as Eh and pH with Cu, Co, and Zn showing a stronger correlation with MnO2 than with organic matter and Fe hydroxides.

Characteristics of gas-saturated deposits of the Kandalaksha bay, the White Sea, according to the seismic-acoustic and litho-geochemical studies

2019 ◽  
pp. 107-114
Author(s):  
M. Yu. Tokarev ◽  
E. N. Poludetkina ◽  
A. V. Starovoytov ◽  
A. S. Pirogova ◽  
S. R. Korost ◽  
...  
Keyword(s):  
Organic Matter ◽  
Gas Phase ◽  
White Sea ◽  
Sedimentary Sequence ◽  
The White Sea ◽  
Glacial Sediments ◽  
Kandalaksha Bay ◽  
Maximal Thickness ◽  
Kandalaksha Gulf ◽  
Geochemical Studies

The article discusses the results of complex geological, geophysical and geochemical studies of gas-saturated sediments within the Kandalaksha gulf, the White Sea. As a part of the marine study detailed seismoacoustic studies were conducted, resulting in the geometry of the seabed, the distribution of geological peculiarities of the sedimentary sequence, including the zones of focused unloading of hydrocarbon fluids. It is shown that assemblages of the «gas caps» are confined to the zones of maximal thickness of post-glacial sediments. The composition of the organic matter in the sediments and the gas phase has been studied in detail.

scholarly journals Lipid biomarkers in Holocene and glacial sediments from ancient Lake Ohrid (Macedonia, Albania)

2010 ◽  
Vol 7 (11) ◽  
pp. 3473-3489 ◽  
Author(s):  
J. Holtvoeth ◽  
H. Vogel ◽  
B. Wagner ◽  
G. A. Wolff
Keyword(s):  
Organic Matter ◽  
Lipid Biomarkers ◽  
Lake Ohrid ◽  
Labile Organic Matter ◽  
Glacial Sediments ◽  
Plant Matter ◽  
Lipid Biomarker ◽  
First Results ◽  
Near Shore

Abstract. Organic matter preserved in Lake Ohrid sediments originates from aquatic and terrestrial sources. Its variable composition reflects climate-controlled changes in the lake basin's hydrology and related organic matter export, i.e. changes in primary productivity, terrestrial plant matter input and soil erosion. Here, we present first results from lipid biomarker investigations of Lake Ohrid sediments from two near-shore settings: site Lz1120 near the southern shore, with low-lying lands nearby and probably influenced by river discharge, and site Co1202 which is close to the steep eastern slopes. Variable proportions of terrestrial n-alkanoic acids and n-alkanols as well as compositional changes of ω-hydroxy acids document differences in soil organic matter supply between the sites and during different climate stages (glacial, Holocene, 8.2 ka cooling event). Changes in the vegetation cover are suggested by changes in the dominant chain length of terrestrial n-alkanols. Effective microbial degradation of labile organic matter and in situ contribution of organic matter derived from the microbes themselves are both evident in the sediments. We found evidence for anoxic conditions within the photic zone by detecting epicholestanol and tetrahymanol from sulphur-oxidising phototrophic bacteria and bacterivorous ciliates and for the influence of a settled human community from the occurrence of coprostanol, a biomarker for human and animal faeces (pigs, sheep, goats), in an early Holocene sample. This study illustrates the potential of lipid biomarkers for future environmental reconstructions using one of Europe's oldest continental climate archives, Lake Ohrid.

Parameters for a Roll On-Roll Off Marine Intermodal Service on Lake Superior

2003 ◽  
Vol 1820 (1) ◽  
pp. 46-54
Author(s):  
Richard D. Stewart ◽  
Terry LaVoie ◽  
Nathan Shutes
Keyword(s):  
Lake Superior ◽  
The United States ◽  
Future Application ◽  
Spreadsheet Model ◽  
Thunder Bay ◽  
Application Potential ◽  
Terminal Design ◽  
The Baltic ◽  
Terminal Operations ◽  
Cost Factors

The feasibility of reestablishing roll on–roll off (RO–RO) service linking Thunder Bay, Ontario, and the Twin Ports of Duluth, Minnesota, and Superior, Wisconsin, was examined. An analysis of similar services both on the Great Lakes and overseas was undertaken. Previous operations on the same route on Lake Superior and short sea service in the Baltic region were analyzed, and the attributes of an appropriate vessel type, such as ice strengthened scantlings and adequate speeds, were determined. A route schedule for a typical vessel was developed. A profile of a suitable vessel was prepared, and the market availability of the vessels was assessed. Issues in terminal design and operation were applied to potential docks in the ports of call to determine the adequacy of shoreside facilities. Cost factors for vessel operations and terminal operations were determined, and a spreadsheet model was developed for future application. Potential revenue streams from vessel and terminal operations were also explored. Revenue generators included day passengers as well as trailers and containers. The feasibility of linking the RO–RO service to a larger intermodal system serving Canada and the United States was also assessed.

scholarly journals Changes of risky element concentrations under organic and mineral fertilization  

2016 ◽  
Vol 62 (No. 8) ◽  
pp. 355-360 ◽  
Author(s):  
L. Hlisnikovský ◽  
G. Mühlbachová ◽  
E. Kunzová ◽  
M. Hejcman ◽  
M. Pechová
Keyword(s):  
Organic Matter ◽  
Ph Value ◽  
Mineral Fertilizer ◽  
Organic Fertilizers ◽  
Pig Slurry ◽  
Mineral Fertilization ◽  
Labile Organic Matter ◽  
Element Concentrations ◽  
Fresh Organic Matter ◽  
The Impact

The 28-day incubation experiment was carried out to evaluate the impact of the application of digestate (Dig); digestate with straw (DigSt); pig slurry (Slu) and mineral fertilizer (NPK) on Cd, Cu, Mn and Zn availability, on K<sub>2</sub>SO<sub>4</sub>-extractable carbon content and on the soil pH value in long-term contaminated soil. At days three and seven of the experiment, the 0.01 mol/L CaCl<sub>2</sub>-extractable fractions of Cd, Zn and Mn significantly decreased under organic treatments (Dig, DigSt and Slu) with the most pronounced effect under Dig treatment. The NPK treatment caused the increase of risky element concentrations since day 21 of incubation which was accompanied with pH decrease. The contents of 0.5 mol/L K<sub>2</sub>SO<sub>4</sub>-extractable carbon were the highest at day 3 and 7 of incubation in organic treatments. The significant correlations between 0.5 mol/L K<sub>2</sub>SO<sub>4</sub>-extractable carbon and CaCl<sub>2</sub>-extractable metal concentrations showed a close relationship between fresh organic matter added in organic fertilizers and risky element availability, suggesting that newly added labile organic matter can form temporary ligands with risky elements and release them later following its decomposition.  

Variations in Sediment Accumulation Rates and the Flux of Labile Organic Matter in Eastern Lake Superior Basins

1989 ◽  
Vol 15 (1) ◽  
pp. 104-122 ◽  
Author(s):  
J. Val Klump ◽  
Robert Paddock ◽  
Charles C. Remsen ◽  
Sharon Fitzgerald ◽  
Martin Boraas ◽  
...  
Keyword(s):  
Organic Matter ◽  
Lake Superior ◽  
Sediment Accumulation ◽  
Accumulation Rates ◽  
Labile Organic Matter
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