scholarly journals Increasing iron concentrations in surface waters – a factor behind brownification?

2012 ◽  
Vol 9 (4) ◽  
pp. 1465-1478 ◽  
Author(s):  
E. S. Kritzberg ◽  
S. M. Ekström
Keyword(s):  
Organic Matter ◽  
Surface Waters ◽  
Natural Waters ◽  
Iron Concentration ◽  
Monitoring Program ◽  
Organic Matter Content ◽  
Matter Content ◽  
Water Color ◽  
The North ◽  
Iron Concentrations

Abstract. Browning of inland waters has been noted over large parts of the Northern hemisphere and is a phenomenon with both ecological and societal consequences. The increase in water color is generally ascribed to increasing concentrations of dissolved organic matter of terrestrial origin. However, oftentimes the increase in water color is larger than that of organic matter, implying that changes in the concentration of organic matter alone cannot explain the enhanced water color. Water color is known to be affected also by the quality of organic matter and the prevalence of iron. Here we investigated trends in water color, organic matter and iron between 1972 and 2010 in 30 rivers draining into the Swedish coast (data from the national Swedish monitoring program), and performed a laboratory iron addition experiment to natural waters, to evaluate the role of iron and organic matter in determining water color. By comparing the effect of iron additions on water color in the experiment, to variation in water color and iron concentration in the monitoring data, we show that iron can explain a significant share of the variation in water color (on average 25 %), especially in the rivers in the north of Sweden (up to 74 %). Furthermore, positive trends for iron are seen in 27 of 30 rivers (21–468 %) and the increase in iron is larger than that of organic matter, indicating that iron and organic matter concentrations are controlled by similar but not identical processes. We speculate that increasing iron concentrations can be caused by changes in redox conditions, that mean that more anoxic water with high concentrations of soluble FeII are feeding into the surface waters. More studies are needed about why iron is increasing so strongly, since both causes and consequences are partly different from those of increasing organic matter content.

scholarly journals Increasing iron concentrations in surface waters – a factor behind brownification?

2011 ◽  
Vol 8 (6) ◽  
pp. 12285-12316 ◽  
Author(s):  
E. S. Kritzberg ◽  
S. M. Ekström
Keyword(s):  
Organic Matter ◽  
Surface Waters ◽  
Natural Waters ◽  
Iron Concentration ◽  
Organic Matter Content ◽  
Matter Content ◽  
Water Color ◽  
The North ◽  
High Concentrations ◽  
Iron Concentrations

Abstract. Browning of inland waters has been noted over large parts of the Northern Hemisphere and is a phenomenon with both ecological and societal consequences. The increase in water color is generally ascribed to increasing amounts of dissolved organic matter of terrestrial origin. However, oftentimes the increase in water color is larger than that of organic matter, implying that changes in the amount of organic matter alone cannot explain the enhanced water color. Water color is known to be affected also by the quality of organic matter and the prevalence of iron. Here we investigated trends in water color, organic matter and iron between 1972 and 2010 in 30 rivers draining into the Swedish cost, and peformed a laboratory iron addition experiment to natural waters, to evaluate the role of iron and organic matter in determining water color. By comparing the effect of iron additions on water color in the experiment, to variation in water color and iron concentration in the monitoring data, we show that iron can explain a significant share of the variation in water color (on average 25%), especially in the rivers in the north of Sweden (up to 74%). Further more, positive trends for iron are seen in 27 of 30 rivers (21–468%) and the increase in iron is larger than that of organic matter, indicating that iron and organic matter concentrations are controlled by similar but not identical processes. We speculate that increasing iron concentrations can be caused by changes in redox conditions, that mean that more anoxic water with high concentrations of soluble FeII are feeding into the surface waters. More studies are needed about why iron is increasing so strongly, since both causes and consequences are partly different from those of increasing organic matter content.

scholarly journals Transformation of S-Bearing Minerals in Organic Matter-Rich Sediments from a Saline Lake with Hydrothermal Inputs

Minerals ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 525
Author(s):  
Gabriel Ricardo Cifuentes ◽  
Juan Jiménez-Millán ◽  
Claudia Patricia Quevedo ◽  
Rosario Jiménez-Espinosa
Keyword(s):  
Organic Matter ◽  
Surface Waters ◽  
Saline Lake ◽  
Organic Matter Content ◽  
Matter Content ◽  
Geothermal Systems ◽  
Transmission Electron ◽  
The Common ◽  
Mixed Layers ◽  
Raman Microspectrometry

Geothermal systems can provide significant amounts of hydrothermal sulfur to surface waters, increasing salinity and avoiding some of the common anthropic uses. The objective of this study was to investigate the sedimentary neoformation of S-bearing phases in organic matter-rich sediments from a saline lake with hydrothermal inputs (Sochagota Lake, Colombia). Detrital kaolinite and quartz are the main minerals of the materials deposited in the Sochagota Lake. Neoformed clay minerals (illite and illite-dioctahedral vermiculite mixed layers) are concentrated in the central and northern part of the lake in sediments with high organic matter content. The most organic matter-rich materials are characterized by S-bearing minerals: mackinawite, pyrite, and elemental sulfur (S°). FESEM, high-resolution transmission electron microscopy (HRTEM), EDS, and Raman microspectrometry have revealed the presence of cell-shape aggregates of mackinawite nanoparticles filling the inner part of plant fragments, indicating that microorganisms were involved in the hydrothermal sulfur uptake. The alteration of mackinawite in free sulfide excess environment produced the formation of framboidal pyrite. The evolution to conditions with the presence of oxygen favored the formation of complex S° morphologies.

Optimization of conditions for the determination of the organic matter content of waters by reagentless oxithermography and its application to the analysis of natural waters

2016 ◽  
Vol 71 (10) ◽  
pp. 1022-1027 ◽  
Author(s):  
I. V. Rogovaya ◽  
B. K. Zuev ◽  
T. V. Titova ◽  
S. V. Morzhukhina ◽  
A. E. Saraeva ◽  
...  
Keyword(s):  
Organic Matter ◽  
Natural Waters ◽  
Organic Matter Content ◽  
Matter Content

scholarly journals Upper Jurassic–Lower Cretaceous Source Rocks in the North of Western Siberia: Comprehensive Geochemical Characterization and Reconstruction of Paleo-Sedimentation Conditions

Geosciences ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 320
Author(s):  
Evgeniya Leushina ◽  
Timur Bulatov ◽  
Elena Kozlova ◽  
Ivan Panchenko ◽  
Andrey Voropaev ◽  
...  
Keyword(s):  
Organic Matter ◽  
Lower Cretaceous ◽  
Organic Matter Content ◽  
Upper Jurassic ◽  
Matter Content ◽  
Source Rocks ◽  
Organic Carbon Content ◽  
Sea Level Changes ◽  
The North ◽  
Terrigenous Sedimentation

The present work is devoted to geochemical studies of the Bazhenov Formation in the north of the West Siberian Petroleum Basin. The object is the Upper Jurassic–Lower Cretaceous section, characterized by significant variations in total organic carbon content and petroleum generation potential of organic matter at the beginning of the oil window. The manuscript presents the integration of isotopic and geochemical analyses aimed at the evaluation of the genesis of the rocks in the peripheral part of the Bazhenov Sea and reconstruction of paleoenvironments that controlled the accumulation of organic matter in sediments, its composition and diagenetic alterations. According to the obtained data, the sediments were accumulated under marine conditions with a generally moderate and periodically increasing terrigenous influx. The variations in organic matter composition are determined by redox conditions and terrigenous input which correlate with the eustatic sea level changes during transgressive/regressive cycles and activation of currents. Transgression is associated with an intensive accumulation of organic matter under anoxic to euxinic conditions and insignificant influence of terrigenous sources, resulting in the formation of rocks with oil-generating properties. During the regression periods, the terrigenous sedimentation increased along with the dissolved oxygen concentration, and deposits with low organic matter content and gas-generating properties were formed.

scholarly journals Lelydorp project-a pilot scheme for land development in Surinam.

1954 ◽  
Vol 2 (2) ◽  
pp. 120-133
Author(s):  
J.H. De Haan ◽  
J.A.H. Hendriks
Keyword(s):  
Organic Matter ◽  
Coastal Plain ◽  
Organic Matter Content ◽  
Land Development ◽  
Matter Content ◽  
Soil Types ◽  
Land Utilization ◽  
The North ◽  
Pilot Scheme ◽  
Export Crops

Agriculture, land utilization, land clearance and development in Surinam are discussed. The Lelydorp project is a pilot scheme in an infertile area on the old coastal plain of Surinam that runs parallel with the present coastline. In the north of the plain the land is sandy and undulating; in the south the soils are silty loams and clays of the old tidal flats. Five soil types are described. All are low in P and K. The organic-matter content of the valley soils and swamp soils is fairly high. It is hoped that the project will provide the basis for developing small independent farms by mixed farming and cultivation of perennial export crops. The farms will be mechanized as far as possible. (Abstract retrieved from CAB Abstracts by CABI’s permission)

scholarly journals Analysis of Organic Matter Content in Water and Sediment in The Coastal Waters of Bengkalis Island, Riau Province

2021 ◽  
Vol 934 (1) ◽  
pp. 012055
Author(s):  
D Yoswaty ◽  
B Amin ◽  
Nursyirwani ◽  
H Winanda ◽  
D D Sianturi ◽  
...  
Keyword(s):  
Organic Matter ◽  
Coastal Waters ◽  
Anthropogenic Activities ◽  
Organic Matter Content ◽  
Strong Relationship ◽  
Matter Content ◽  
Coefficient Of Determination ◽  
The North ◽  
Water And Sediment ◽  
Sediment Fraction

Abstract Anthropogenic activities in the coastal waters of Bengkalis Island, Riau Province are thought to have increased due to human activities (settlements, ports, agriculture, households and industry). This caused an increase in organic matter in water and sediment in coastal waters. The content of organic matter in water and sediment can be used as an indicator of the quality of coastal waters. The research aimed to analyze the content of organic matter in water and sediment in the coastal waters of Bengkalis Island. The used purposive sampling. The research was carried out in April – July 2021, consisting of 4 research stations and each station consisted of 3 sampling points. Sampling was carried out in the intertidal zone in the north and south of Bengkalis Island, namely station I (Air Putih Village), Station II (Jangkang Village), station III (Selat Baru Village) and station IV (Liong Estuary). The results of the analysis of organic matter content in seawater ranged from 32.39-34.89 mg/l, the highest was at station I and the lowest was at station II. The results of the analysis of organic matter content in sediment of Bengkalis Island ranged from 0.01-0.31%, the highest was at station I and the lowest was at station II. A simple linear regression test showed that the relationship between the organic matter content of seawater and sediments in the coastal waters of Bengkalis Island was classified as a strong relationship with a correlation coefficient (r) 0.720 and a coefficient of determination (R2) 0.518. The results also show that the coastal waters of Bengkalis Island have a type of sediment fraction which is dominated by sandy mud.

HEAVY METAL SPECIATION IN BOTTOM SEDIMENTS OF THE VYSHNEVOLOTSKY RESERVOIR

2018 ◽  
pp. 46-54
Author(s):  
O. A. Lipatnikova
Keyword(s):  
Heavy Metal ◽  
Organic Matter ◽  
Bottom Sediments ◽  
Metal Speciation ◽  
Organic Matter Content ◽  
Water Reservoir ◽  
Matter Content ◽  
Heavy Metal Speciation ◽  
Mobile Forms ◽  
Manganese Hydroxides

The study of heavy metal speciation in bottom sediments of the Vyshnevolotsky water reservoir is presented in this paper. Sequential selective procedure was used to determine the heavy metal speciation in bottom sediments and thermodynamic calculation — to determine ones in interstitial water. It has been shown that Mn are mainly presented in exchangeable and carbonate forms; for Fe, Zn, Pb и Co the forms are related to iron and manganese hydroxides is played an important role; and Cu and Ni are mainly associated with organic matter. In interstitial waters the main forms of heavy metal speciation are free ions for Zn, Ni, Co and Cd, carbonate complexes for Pb, fulvate complexes for Cu. Effects of particle size and organic matter content in sediments on distribution of mobile and potentially mobile forms of toxic elements have been revealed.

Physico-Chemical Properties of Soil Collected from Chandrabhaga River in Kalmeshwar, Nagpur, Maharashtra

2020 ◽  
Vol 07 (02) ◽  
pp. 1-3
Author(s):  
Amita M Watkar ◽  
Keyword(s):  
Organic Matter ◽  
Soil Quality ◽  
Agricultural Land ◽  
Organic Matter Content ◽  
Chemical Properties ◽  
Matter Content ◽  
Soil Attributes ◽  
Essential Components ◽  
Agricultural Land Management ◽  
Physical And Chemical

Soil, itself means Soul of Infinite Life. Soil is the naturally occurring unconsolidated or loose covering on the earth’s surface. Physical properties depend upon the amount, size, shape, arrangement, and mineral composition of soil particles. It also depends on the organic matter content and pore spaces. Chemical properties depend on the Inorganic and organic matter present in the soil. Soils are the essential components of the environment and foundation resources for nearly all types of land use, besides being the most important component of sustainable agriculture. Therefore, assessment of soil quality and its direction of change with time is an ideal and primary indicator of sustainable agricultural land management. Soil quality indicators refer to measurable soil attributes that influence the capacity of a soil to function, within the limits imposed by the ecosystem, to preserve biological productivity and environmental quality and promote plant, animal and human health. The present study is to assess these soil attributes such as physical and chemical properties season-wise.

Sign in / Sign up

Export Citation Format

Share Document