scholarly journals HYDROCHEMICAL CONDITIONS AND ENVIRONMENTS PROBLEMS IN THE LOW LAND ZONE OF PINIOS RIVER OF ILIAS DEPARTMENT

2004 ◽  
Vol 36 (4) ◽  
pp. 2002
Author(s):  
N. Λαμπράκης ◽  
Soren Jessen ◽  
Γ. Παναγόπουλος ◽  
E. Πυτικάκης
Keyword(s):  
Trace Elements ◽  
Thermal Water ◽  
Chemical Elements ◽  
Total Iron ◽  
Eastern Coast ◽  
Chemical Analyses ◽  
Reducing Conditions ◽  
Groundwater Samples ◽  
Pinios River ◽  
High Concentrations

The lower Pinios basin at the eastern coast of the Peloponnesus, hosts a system of alternative aquifers in the Pleistocene sediments of "Kalatha" formation. The elaboration of chemical analyses of the principal and trace elements of groundwater samples shown that a Redox environments and the presence of deep thermal water affect the groundwater quality. The aquifers sectors with reducing conditions are characterized by high concentrations of alkalinity, ammonia, total iron and total manganese groundwater. In the aquifers sectors with oxidizing conditions the values of the above parameters are low and the dominance of the chemical elements oxidizing forms are obvious.

scholarly journals Isotope characterisation of deep aquifers in the Gwda catchment, northern Poland

Geologos ◽  
2016 ◽  
Vol 22 (2) ◽  
pp. 137-147
Author(s):  
Tomasz Kotowski ◽  
Stefan Satora
Keyword(s):  
Chemical Analyses ◽  
Uncertainty Of Measurement ◽  
Deep Aquifers ◽  
Northern Poland ◽  
Groundwater Samples ◽  
Geological Formation ◽  
Basic Source ◽  
High Concentrations ◽  
Isotope Measurements ◽  
Hydrogeological Systems

AbstractWe present the results of isotope measurements (δ18O, δ D, δ13CDICand14C) and chemical analyses (TDS, TOC, HCO3-, SO42-, Cl-, NO3-, NH4+, Ca2+, Mg2+Na+and K+) conducted on groundwater samples collected from deep Cenozoic aquifers. These aquifers are the basic source of drinking water at numerous localities within the study area in northern Poland. Most of the δ18O determinations are characterised by low variability (i.e., > 70 per cent of δ18O are between -9.5‰ and -9.2‰). In most cases tritium activity was not detected or its content slightly exceeded the uncertainty of measurement (from ±0.3 T.U. to ± 0.5 T.U.). On average, 14C activity is twice higher than that under similar conditions and in hydrogeological systems. The δ13CDICvalues fall within the -13.6‰ to -12.8‰ range. A slight variability is observed when considering all isotope and chemical data within the study area and under these hydrogeological conditions. In general, the results of isotope and chemical analyses seem to be homogeneous, indicating the presence of closely similar groundwaters in the system, irrespective of geological formation. It is likely that there is a significant hydraulic connection between shallow and deep aquifers in the Gwda catchment, which indicates the potential for seepage of pollutants from shallow Pleistocene to deep Miocene aquifers. This can endanger the latter by e.g., high concentrations of NO3-, SO42-and Cl-ions from shallow aquifers within the Gwda catchment.

Geochemical, Topographical, and Meteorological Controls on Groundwater Arsenic Contamination in Sharda River Basin of Uttar Pradesh, India

2020 ◽  
Vol 6 (2) ◽  
pp. 71-87
Author(s):  
Sonal Bindal ◽  
Anand Kumar ◽  
Javed Mallick ◽  
Satyanarayan Shashtri ◽  
Pankaj Kumar ◽  
...  
Keyword(s):  
Uttar Pradesh ◽  
Common Source ◽  
Reducing Conditions ◽  
Groundwater Samples ◽  
Groundwater Arsenic ◽  
Shallow Wells ◽  
Scatter Plots ◽  
Long Term Trends ◽  
High Concentrations ◽  
Sequential Reduction

Groundwater arsenic (As) contamination is a health threat for millions of people in the Gangetic plains of India. It is, therefore, critical to understand the mechanism of As enrichment to reduce the As exposure. Geochemical analysis of 30 groundwater samples collected across the banks of River Sharda was performed for the identification of major geochemical processes controlling groundwater geochemistry. Shallow wells (3-10 m) are found to be contaminated with As and is confined to newer alluvium of Holocene age. The average temporal decline of the groundwater level was observed across 10 monitoring stations is 0.067 m/yr. Decreasing rainfall, lesser recharge and huge groundwater extraction for irrigation might have impacted the groundwater to flow faster, while the increase in temperature and weathering regime favoured arsenic mobilisation. The long-term trends of rainfall show a decline of 1.97 mm/yr and the temperature increase is observed to be 0.0049°C/yr. These changes in rainfall and temperature also might have impacted the As mobilisation in groundwater. NO3- was found to be low in samples with low As concentrations, indicating the prevalence of reducing conditions. Whereas high concentrations of Fe were observed for high As samples, indicating their common source of origin. Also, the alkaline nature of aquifer and high concentrations of HCO3- might have contributed to As enrichment. Results from scatter plots and correlation matrix also support this sequential reduction leading to the reductive dissolution of iron oxyhydroxides and thus enriching the concentration of As in the groundwater.

The trace elements in the snow cover of the 2018-2019 season in the Novy Urengoy region (Arctic part of Western Siberia)

2021 ◽  
Author(s):  
Dmitriy Belyanin ◽  
Yuliya Vosel ◽  
Kseniya Mezina ◽  
Mikhail Melgunov ◽  
Vladimir Dobretsov
Keyword(s):  
Trace Elements ◽  
Snow Cover ◽  
Western Siberia ◽  
Chemical Elements ◽  
Winter Season ◽  
Background Concentrations ◽  
Russian Science ◽  
Hysplit Model ◽  
Entire Depth ◽  
High Concentrations

<p>Revealing background concentrations of chemical elements and radionuclides in the surface components of the environment exposed to constant atmospheric processes is the first step towards detecting areas with their abnormally high concentrations of natural and man-made character. In this work, we present the results of studying the content of trace elements and microparticles in the snow cover accumulated during the 2018-2019 winter season in the Novy Urengoy region. Samples were taken along the roads using a rare sampling grid over the entire depth of the snow cover. In laboratory conditions, after the snow melted, the solution was filtered. The results of mass spectrometric measurements of the trace element concentrations in the filtrates show that their composition is homogeneous and does not vary slightly at the sampling points. Evaluation of the prevailing directions of backward air-mass trajectories was computed using the HYSPLIT model.</p><p>This work was supported by the Russian Science Foundation grant (project No 18-77-10039). Analytical studies were carried out at the Center for multi-elemental and isotope research SB RAS.</p>

scholarly journals Stream contamination by trace elements: biota incorporation and phytoremediation

2020 ◽  
Vol 32 ◽  
Author(s):  
Rafael Chaves Loureiro ◽  
Luiz Ubiratan Hepp
Keyword(s):  
Trace Elements ◽  
Chemical Elements ◽  
Aquatic Organisms ◽  
Terrestrial Ecosystems ◽  
Essential Elements ◽  
Point Sources ◽  
Chemical Pollution ◽  
Public Managers ◽  
Stream Contamination ◽  
High Concentrations

Abstract: In this review, we present information about the presence of trace elements on streams and the consequences related to the increase of these chemical elements on aquatic systems. Although several studies on trace elements contamination in aquatic environments are conducted on point sources, non-point sources also have a high potential to contaminate water bodies. Some trace elements are important for the development of an organism. However, even essential elements, in high concentrations, may be toxic to aquatic organisms. In some cases, trace elements may accumulate and be transferred along food webs, generating changes in the structure and functioning of terrestrial ecosystems. The phytoremediation techniques could be an important tool in reducing the problems generated by trace elements. Thus, understanding the effects generated by the increase of trace elements concentrations on aquatic ecosystems becomes important to help public managers to apply solutions for the mitigation of this chemical pollution on natural resources.

scholarly journals Hydrochemical Characteristics and Groundwater Quality in the Island of Lesvos, Greece

2013 ◽  
Vol 14 (4) ◽  
pp. 422-430
Keyword(s):  
Volcanic Activity ◽  
Hydrothermal Activity ◽  
Sodium Adsorption Ratio ◽  
Acidic Ph ◽  
Chemical Analyses ◽  
Hydrochemical Characteristics ◽  
Sampling Locations ◽  
Groundwater Samples ◽  
The Us ◽  
High Concentrations

The hydrochemical characteristics of groundwater in the island of Lesvos, Greece, were studied based on chemical analyses of groundwater samples collected from 30 locations covering all the island’s major aquifers hosted in different lithological formations. The Plagioclase dissolution was found to be responsible for the observed high concentrations of Na and Ca in the majority of volcanic aquifers. Ultrabasic rocks enrich groundwater with magnesium while intense hydrothermal activity and extensive alteration zones, which exist locally as a result of a recent volcanic activity, are associated with the existence of sulphate type groundwater and acidic pH in some areas. Seawater intrusion was found to be associated with high Cl- concentrations in three sampling locations. Based on sodium adsorption ratio, percent sodium, and the US salinity diagrams, the vast majority of groundwater samples were evaluated as suitable for irrigation purposes.

Intervarietal specificity of the accumulation of trace elements by winter garlic in the Moscow region

2020 ◽  
pp. 12-20
Author(s):  
T.M. Seredin ◽  
A.V. Soldatenko ◽  
V.V. Shumilina ◽  
E.G. Kozar ◽  
I.G. Kokhtenkova
Keyword(s):  
Trace Elements ◽  
Allium Sativum ◽  
Chemical Elements ◽  
Good Source ◽  
Maximum Accumulation ◽  
Calcium Phosphorus ◽  
Phosphorus Iron ◽  
Manganese Aluminum ◽  
High Concentrations ◽  
Potassium Magnesium

An assessment was made, and varietal differences in the levels of accumulation of five macro - and eight microelements of ten varieties of winter garlic were established. It was found that in addition to the high content of potassium, magnesium, calcium, phosphorus and sodium, garlic is also an active accumulator of zinc, iron and silicon, which is a good source of minerals for the human body. It is demonstrated that the Podnebesniy variety is able to accumulate relatively high concentrations of magnesium. Based on our research on 13 elements in ecosystems with normal anthropogenic and technical impact, it was established that the level of accumulation of elements in plants depends on the element and has varietal characteristics. Basically, the varieties are distinguished by the level of accumulation of 1-5 elements. There are Dubkovskiy and Strelets varieties with a low level of accumulation of ten and seven chemical elements, respectively, and the Odintsovo Yubileyniy variety with the maximum accumulation of valuable elements: potassium, calcium, phosphorus, iron, silicon, manganese, aluminum and boron. On average, the elements for winter garlic varieties were distributed as follows in descending order: K>Mg>Ca>P>Na>Fe>Si>Z n>Mn>B>Cu>Al>Ni. The identified varietal features of the Allium sativum L. species can be taken into account when selecting an assortment to improve the mineral composition of the human vegetable diet.

DISTRIBUTION OF DISSOLVED CHEMICAL ELEMENTS IN THE YENISEI RIVER ESTUARY AND ADJACENT WATER AREA OF THE KARA SEA

2017 ◽  
Author(s):  
Alla Savenko ◽  
Alla Savenko ◽  
Oleg Pokrovsky ◽  
Oleg Pokrovsky ◽  
Irina Streletskaya ◽  
...  
Keyword(s):  
Trace Elements ◽  
River Runoff ◽  
Major Ions ◽  
Chemical Elements ◽  
River Estuary ◽  
Water Area ◽  
Kara Sea ◽  
Yenisei River ◽  
Adjacent Water ◽  
The Yenisei River

The distribution of dissolved chemical elements (major ions, nutrients, and trace elements) in the Yenisei River estuary and adjacent water area in 2009 and 2010 are presented. These results were compared to the data obtained during previous hydrochemical studies of this region. The transport of major cations (Na, K, Mg, Ca) and some trace elements (Rb, Cs, Sr, B, F, As, Mo, U) in the estuary follows conservative mixing. Alkalinity also belongs to conservative components, however this parameter exhibits substantial spatial heterogeneity caused by complex hydrological structure of the Yenisei Bay and adjoining part of the Kara Sea formed under the influence of several sources of desalination and salty waters inflow. Concentrations of Pmin, Si, and V in the desalinized waters of photic layer decrease seaward owing to uptake by phytoplankton. The losses of these elements reach 30–57, 30, and 9% of their supply by river runoff, respectively. The content of dissolved phosphates and vanadium in the intermediate and near-bottom layers of the Yenisei River estuary strongly increases with salinity due to regeneration of precipitated organic matter, whereas silica remineralization is much less pronounced. Barium is characterized by additional input of dissolved forms in the mixing zone in the quantity comparable to that carried out by river runoff. This may be caused by its desorption from river suspended matter due to ion exchange. The transport of dissolved Al and Mn in the estuarine zone is probably controlled by the coagulation and flocculation of organic and organomineral colloids, which is indicated by a decrease in the concentration of these elements at the beginning of the estuary (31 and 56%, respectively) followed by a stable concentration further seaward.

Emissions of porewater compounds and gases from the subaquatic sediment disposal site “rodewischhafen”, hamburg harbour

1998 ◽  
Vol 37 (6-7) ◽  
pp. 87-93 ◽  
Author(s):  
M. Kussmaul ◽  
A. Groengroeft ◽  
H. Koethe
Keyword(s):  
Water Surface ◽  
Disposal Site ◽  
Dredged Material ◽  
Water Fluxes ◽  
Gas Emissions ◽  
Fine Grained ◽  
Deposit Surface ◽  
Groundwater Samples ◽  
High Concentrations ◽  
Mud Deposit

In the year 1993 a confined and unused harbour basin was used to store 290,000 m3 of fine-grained dredged material from Hamburg harbour. About 70% of the deposit surface was water covered. The edge areas were above the water table and covered with reed. Emissions of dissolved compounds into the groundwater, as well as surface gas emissions were measured from 1994 to 1996. As indicators for water fluxes from the deposit we used NH4+ and HCO3− because of their high concentrations in mud porewater in comparison to groundwater. The average concentrations of NH4+ and HCO3− in the porewater increased during 2 years from 85 to 250 mg NH4+ 1−1 and from 2.0 to 3.1 g HCO3− 1−1, while the groundwater samples showed constant values of 8 mg NH4+ 1−1 and 0.7 g HCO3− 1−1. Furthermore, the average gas emissions over the water surface were 3.2 g CH4 m−2 d−1 and 0.8 g CO2 m−2 d−1. In contrast, no methane and 3.0 g CO2 m−2 d−1 were emitted from land areas. The results indicated, that there were no significant emissions of mud porewater compounds into the groundwater but high CH4-emissions over the water covered surface of the mud deposit.

Hydrochemistry and carbonate sediment characterisation of Bacalar Lagoon, Mexican Caribbean

2019 ◽  
Vol 70 (3) ◽  
pp. 382 ◽  
Author(s):  
Nidia I. Tobón Velázquez ◽  
Mario Rebolledo Vieyra ◽  
Adina Paytan ◽  
Kyle H. Broach ◽  
Laura M. Hernández Terrones
Keyword(s):  
Trace Elements ◽  
Water Column ◽  
Saturation Index ◽  
Major Elements ◽  
Anthropogenic Sources ◽  
Pollution Indices ◽  
Mexican Caribbean ◽  
High Concentrations ◽  
Geochemical Analyses ◽  
Changes Over Time

The aim of the study is to determine the distribution of trace and major elements in the water and in the sediments of the south part of the Bacalar Lagoon and to identify the sources of the trace elements and their changes over time. The western part of the lagoon water column is characterised by high concentrations of Ca2+, HCO3– and Sr2+, derived from groundwater input. In contrast, the eastern part of the lagoon is characterised by high concentrations of Mg2+, Na+ and Cl–. The lagoon is not affected by present-day seawater intrusion. Water column and sediment geochemical analyses performed in Bacalar Lagoon show clear spatial distribution of different parameters. The saturation index of the water column indicates three main groups: (1) a zone oversaturated with regard to aragonite, calcite and dolomite; (2) an undersaturated area where all three minerals are dissolving; and (3) an area with calcite equilibrium and undersaturation with regard to the other minerals. Herein we present the first measurements of trace element (Ba2+, Mn2+, K+, Ni2+, Zn2+) concentrations in carbonates obtained from sediments in Bacalar Lagoon. In order to evaluate whether the trace elements are derived from natural or anthropogenic sources, four pollution indices were calculated. The results confirmed that Bacalar Lagoon sediments are not contaminated with Ni2+, K+, Mn2+ and Ba2+, and that the Zn2+ seems to have a predominantly anthropogenic origin.

Temporal and spatial patterns of spawning in jack mackerel, Trachurus declivis (Pisces:Carangidae), during 1988-91 in eastern Tasmanian waters

1995 ◽  
Vol 46 (5) ◽  
pp. 831 ◽  
Author(s):  
A Jordan ◽  
G Pullen ◽  
J Marshall ◽  
H Williams
Keyword(s):  
Thermal Structure ◽  
Shelf Break ◽  
Eastern Coast ◽  
Jack Mackerel ◽  
Spatial And Temporal Patterns ◽  
Cold Event ◽  
Temporal And Spatial ◽  
High Concentrations ◽  
Break Region ◽  
Eggs And Larvae

Ichthyoplankton surveys conducted during the summer and autumn of 1988-89, 1989-90 and 1990-91 along the eastern coast of Tasmania were used to examine the spatial and temporal patterns of eggs and larvae of jack mackerel, Trachurus declivis. Results indicate that the species spawns along the entire eastern coast during summer. Trachurus declivis eggs were most abundant at shelf-break stations, indicating that spawning is concentrated in this region, although high concentrations of eggs were present on the inner shelf in 1988-89, which can be attributed to rapid onshore transport in that year. Larvae were evenly dispersed over the shelf, with the distribution of larval ages showing no indication of inshore recruitment. Considerable interannual differences in sea surface temperatures and vertical thermal structure were apparent, with the warmer waters and strong thermal stratification in the summer of 1988-89 resulting from the influx of subtropical East Australian Current (EAC) water onto the shelf, which corresponded with a major La Nina 'cold event' at that time. It is suggested that the distribution of spawning is unaffected by the interannual variations in oceanography as the mature population spawns in deeper water in the shelf-break region that is unaffected by the warming in surface waters.

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