scholarly journals Accumulation and distribution of zinc and manganese in aquatic ecosystem of Yavoriv water reservoir, Lviv region, Ukraine

2017 ◽  
Vol 19 (74) ◽  
Author(s):  
G. M. Dobryanska ◽  
D. O. Yanovych ◽  
T. M. Shvets ◽  
A. A. Butsyak
Keyword(s):  
Aquatic Ecosystem ◽  
Skeletal Muscles ◽  
Wide Spectrum ◽  
Water Reservoir ◽  
Manganese Concentration ◽  
Bottom Deposits ◽  
Zn Concentration ◽  
Mn Content ◽  
Mn Concentration ◽  
Water Bottom

The paper presents results of investigations of zinc and manganese concentration in the water, bottom deposits and ichthyofauna of Yavoriv water reservoir, which was formed in 2002 in frames of project of Yavoriv sulfur quarry revitalization. Mentioned elements are characterized by wide spectrum of action in fish body, which, depending on their concentration, can be either physiologic or toxic. It was revealed, that concentration of Zn and Mn in the water of Yavoriv water reservoir varied considerably depending on place of samples taking. The lowest Zn concentration in the water was below 1 MPL (maximum permitted level), namely 0.6 µg/l, and the highest – more than 7 MPL (70.5 µg/l). Similar differences were observed concerning Mn concentration in the water – the range of determined values varied from 3.3 (0.3 MPL) to 48.6 µg/l. The same peculiarities of Zn and Mn distribution were estimated in regard to their content in bottom deposits. In particular, difference of Zn concentration in samples of bottom deposits was near 23 times – from 5.4 to 230.0 mg/kg depending on the point of samples taking. Mn content in bottom deposits varies from 61.5 to 1500 mg/kg. Zn and Mn concentration in skeletal muscles, gills and skin of perch and rudd didn’t exceed MPL regardless their content in the water and bottom deposits. In most of cases, gills accumulated these elements more than other investigated tissues.

scholarly journals Spatial distribution of manganese concentration and load in street dust in Mexico City

2020 ◽  
Vol 62 (2, Mar-Abr) ◽  
pp. 147
Author(s):  
Anahí Aguilera ◽  
Francisco Bautista ◽  
Avto Gogichaichvili ◽  
Margarita Eugenia Gutiérrez-Ruiz ◽  
Agueda E Ceniceros-Gómez ◽  
...  
Keyword(s):  
Mexico City ◽  
Inductively Coupled Plasma ◽  
Anthropogenic Activities ◽  
Contamination Factor ◽  
Optical Emission ◽  
Street Dust ◽  
Manganese Concentration ◽  
Inductively Coupled ◽  
Mn Content ◽  
Mn Concentration

Objective. To obtain a first indication of the distribution and extent of manganese (Mn) contamination in Mexico City. Mn concentration and load in street dust were analyzed in order to reveal the most contaminated areas. Materials and methods. 482 samples of street dust were analyzed through inductively coupled plasma-optical emission spec­troscopy. The contamination factor (CF), the geoaccumula­tion index (Igeo) and the spatial interpolations of the kriging indicator were calculated. Results. A slight influence of anthropogenic activities is detected on the Mn content of street dust. The highest levels of pollution by concentra­tion (Igeo=uncontaminated to moderately contaminated) are grouped towards the city’s north (industrial) and center (commercial and high traffic) areas. The areas with the high­est Mn load were located towards the east and northwest areas (Igeo=moderately contaminated). Conclusions. These findings will serve as a baseline to assess future variations in Mn content in Mexico City’s environment.

GEOGRAPHICAL VARIABILITY OF THE ZINC, MANGANESE AND IRON CONCENTRATIONS OF FORAGES GROWN IN NORTHWESTERN MANITOBA

1985 ◽  
Vol 65 (4) ◽  
pp. 861-870 ◽  
Author(s):  
R. J. BOILA ◽  
T. J. DEVLIN ◽  
R. A. DRYSDALE ◽  
L. E. LILLIE
Keyword(s):  
Mineral Content ◽  
Entire Study ◽  
Grazing Cattle ◽  
Zn Concentration ◽  
Zn Content ◽  
Mn Content ◽  
The Mean ◽  
The Difference ◽  
Mn Concentration ◽  
Entire Study Area

From two or three sites per township (93.24 km2), in the cattle-producing area of Northwestern Manitoba, 612 grass and 271 legume samples were collected and analyzed for zinc (Zn), manganese (Mn) and iron (Fe). Analyses were reported on an air-dry basis of approximately 90% dry matter. Within subregions, the mean Zn concentration ranged from 18.6 to 22.0 mg/kg and the mean Mn concentration ranged from 24.1 to 45.1 mg/kg for grass samples. The mean concentrations for the legume samples ranged from 17.8 to 25.5 mg/kg for Zn and 15.6 and 25.6 mg/kg for Mn. The mean Zn content in the legume samples was 3–5 mg/kg higher (P < 0.05) than that of the grass samples in three of seven subregions. In six of seven subregions the mean Mn content was 5–10 mg/kg higher (P < 0.05) in the grass than the legume samples. The range of Fe concentration was 31.3–1044.5 mg/kg for grass and 29.8–617.2 mg/kg for legume samples. Mean Fe for the entire study area was 107.6 and 93.6 mg/kg for grass and legume samples, respectively. For grazing cattle in Northwestern Manitoba, forages were deficient in Zn and Mn to varying degrees, with excessive intakes of Fe through soil contamination of forages possible. Recommendations for supplemental Zn and Mn should apply to the entire study area, and be based on the difference between the mineral content of forages and the requirement of cattle. Key words: Cattle, forage, minerals, zinc, manganese, iron

scholarly journals Cobalt and nickel concentration in the water, bottom deposits and ichthyofauna of Yavoriv water storage basin

2016 ◽  
Vol 18 (2) ◽  
Author(s):  
G. M. Dobryanska ◽  
D. O. Yanovych ◽  
T. M. Shvets ◽  
A. A. Butsyak
Keyword(s):  
Water Storage ◽  
Water Reservoir ◽  
The Body ◽  
Cobalt Concentration ◽  
Normative Values ◽  
Nickel Concentration ◽  
Bottom Deposits ◽  
Storage Basin ◽  
Water Bottom ◽  
Cobalt And Nickel

Arrangement of fishponds and recreation water basins are among most actual directions of technogenic environment recultivation. However, mentioned approach demands constant monitoring of different pollutants content in abiotic and biotic components of created hydroecosystem. This paper presents results of investigations of cobalt and nickel concentration in the water, bottom deposits and ichthyofauna of Yavoriv water storage basin – water reservoir, which was formed in the place of sulfur career. Mentioned elements are characterized by wide spectrum of action in fish body, which, depending on their concentration, can be either physiologic or toxic. During the experiment was revealed, that cobalt concentration in the water of Yavoriv water storage basin was within the normal range, while nickel concentration exceed MPL from 1.26 to 7.65 times depending on sampling place. Concentration of abovementioned elements in the bottom deposits of water basin in different fields of it varied greatly, wherein well–defined correlation between cobalt and nickel level in the water and bottom deposits wasn’t observed. The researches testified also the existence of tissue, organic and species peculiarities of cobalt and nickel accumulation in the body of rudd and perch. In particular, the biggest content of researched elements was observed in the gills of the fishes. Herewith, cobalt concentration in rudd gills exceeds MPL in 3.25 times, in perch gills – in 4.75 times. Nickel concentration in the muscles, gills and skin of rudd exceeds existing normative values in 1.16, 2.25 and 2.32 times respectively; in the muscles, gills and skin of perch – in 1.08, 6.84 and 3.1 times respectively. 

scholarly journals Uptake of Mn and Zn by Cucumber Grown in Closed Hydroponic Systems as Influenced by the Mn and Zn Concentrations in the Supplied Nutrient Solution

HortScience ◽  
2013 ◽  
Vol 48 (3) ◽  
pp. 373-379 ◽  
Author(s):  
Constantinos Tzerakis ◽  
Dimitrios Savvas ◽  
Nick Sigrimis ◽  
Georgios Mavrogiannopoulos
Keyword(s):  
Water Uptake ◽  
Nutrient Solution ◽  
Plant Biomass ◽  
Climatic Conditions ◽  
Zn Concentration ◽  
Mn Content ◽  
Hydroponic Systems ◽  
Experimental Treatments ◽  
Mn Concentration ◽  
Supply Level

The objective of the present experiment was to estimate the uptake of manganese (Mn) and zinc (Zn) by cucumber in closed hydroponic systems at different Mn and Zn concentrations in the recycled nutrient solution under Mediterranean climatic conditions. The obtained data might be used to manage Mn and Zn supply in closed hydroponic crops of cucumber grown in Mediterranean greenhouses and avoid their accumulation to toxic levels. Four Mn levels (10, 40, 80, 120 μM) at a standard Zn concentration (6 μM) and four Zn levels (6, 20, 40, 60 μM) at a standard Mn concentration (10 μM) in the solution supplied to compensate for nutrient and water uptake by plants were applied as experimental treatments. The actual uptake concentrations of Mn and Zn were estimated by applying two different methods. The first method was based on the removal of Mn, Zn, and water from the recycling nutrient solution, whereas the second method was based on the total quantities of Mn and Zn that were recovered in plant biomass in combination with the total water uptake. Both methods gave similar uptake concentrations for Mn in the low-Mn supply level and Zn in all Zn levels. However, in the three higher Mn supply levels, the values estimated on the basis of nutrient removal from the recirculating nutrient solution were significantly higher than those found by measuring the total Mn content in plant biomass. These discrepancies in the three high-Mn treatments were possibly caused by partial immobilization of Mn by oxidizing bacteria in the nutrient solution.

scholarly journals Microelement Supplementation in Dairy Cows by Mineral Lick

2009 ◽  
Vol 78 (1) ◽  
pp. 29-36
Author(s):  
Štěpán Krys ◽  
Eva Lokajová ◽  
Aleš Podhorský ◽  
Leoš Pavlata
Keyword(s):  
Dairy Cows ◽  
Selenium Concentration ◽  
Control Group ◽  
Dry Period ◽  
Total Consumption ◽  
Zn Concentration ◽  
Ad Libitum ◽  
Mn Concentration ◽  
Experimental Group ◽  
Mineral Lick

The aim of this experiment was to verify the option of providing microelement supplementation to dairy cows in the dry period through supplemented mineral lick, and then to compare the content of microelements in the blood, colostrum and milk. The experiment was carried out on a farm with Czech Fleckvieh dairy cows. We formed an experimental group (E), supplied with mineral lick ad libitum enhanced with organic forms of microelements (Se, Zn, Cu, Mn) for four to five weeks before parturition and 1 week after parturition. The control group (C) did not receive any mineral lick. The use of mineral lick by cows was very uneven, its total consumption oscillated between 0 to 250 g of lick per animal per day. Lick feeding did not result in evidential increase of concentrations of monitored microelements in the cows’ blood, colostrum and milk. Only a tendency to increased concentrations of Se and Cu in the blood of group E of cows was observed; the average Se concentration increased by 60 μg l-1 (Cu by 9 μmol l-1), whereas in group C, Se increased only by 30 μg l-1 (Cu by 6 μg l-1). The concentration of microelements in colostrum after parturition dropped quickly. Significant drops were determined for Se, Cu and Zn on the first (for Mn on the second) day after parturition. Selenium concentration in the first colostrum was 5 times higher than in milk, Cu concentration 3 times higher, Zn concentration 4 times higher and Mn concentration 1.3 times higher.

scholarly journals Manganese concentration in plants of the protected natural resource, Kosmaj, in Serbia

2015 ◽  
Vol 67 (1) ◽  
pp. 251-255 ◽  
Author(s):  
Dragica Stankovic ◽  
Vladan Ivetic ◽  
Mirjana Ocokoljic ◽  
Dusan Jokanovic ◽  
Rodoljub Oljaca ◽  
...  
Keyword(s):  
Plant Species ◽  
Natural Resource ◽  
Vegetation Period ◽  
Manganese Concentration ◽  
Vegetative Organs ◽  
Wide Range ◽  
Mn Concentration ◽  
Mn Concentrations

This study was focused on determining the manganese (Mn) concentration in vegetative organs of 10 plant species (8 woody and 2 herbaceous), from four sites in the protected natural resource Kosmaj. The concentration of Mn was analyzed at the beginning of the vegetation period, during a two-year period (2012-2013). The results indicate a wide range of Mn concentrations, depending on site and plant species.

Investigation of heavy metals transportation from soil to the pine tree

2004 ◽  
Vol 50 (3) ◽  
pp. 239-244 ◽  
Author(s):  
E. Baltrénaité ◽  
D. Butkus
Keyword(s):  
Heavy Metals ◽  
Forest Ecosystems ◽  
Heavy Traffic ◽  
Mineral Particles ◽  
Pine Tree ◽  
Zn Concentration ◽  
Cr Concentration ◽  
The Impact ◽  
Mn Concentration ◽  
Common Tree

The Scots pine (Pinus sylvestris L.) is the most common tree in Lithuanian forests. Research on the impact of pollutants on pines allows us to evaluate pollutants in a major part of Lithuanian forests. Heavy metals (HMs) are among the major pollutants entering forest ecosystems in different ways: in their wet and dry form they come from local or distant sources of emission by being transported from seas alongside with nutrients and sea salt, washed up from the dead plants accumulated in soil, and together with mineral particles brought by wind or water. During the period of investigation, a decrease in the Cr concentration in pine rings is seen. High Zn concentrations (in 1987-1989 Zn concentration was 27.6 mg·kg-1) in the pine may be caused by emissions from heavy traffic. The results have shown that Mn has the highest concentration as compared with that of other HMs in the soil around the pine (at the depth of 30-40 cm, Mn concentration is 780 mg·kg-1). In comparison with other HMs, Cu and Zn have the largest factor of transport from the soil to the wood (0.39 and 0.49 respectively).

Quantitative Determination of Low Contents of Manganese in Steels by EPMA

2019 ◽  
Vol 25 (3) ◽  
pp. 625-629 ◽  
Author(s):  
Daoling Wang ◽  
Aiqin Sun
Keyword(s):  
Calibration Curve ◽  
Alloy Element ◽  
Correction Method ◽  
Time Saving ◽  
Curve Method ◽  
Mn Content ◽  
Alloy Standard ◽  
Mn Concentration ◽  
Probe Measurements

AbstractThe fluorescence effect induced by Kβ photons is usually so small that it can be neglected. However, in the Fe–Mn system, omitting Kβ fluorescence correction will lead to the overestimation of the Mn content especially when Mn is the minor alloy element. In this study, the error in the Mn concentration induced by Kβ fluorescence was investigated by both Monte Carlo simulation, using the pyPENELOPE program, and systematic electron probe measurements on the Fe–0.53% Mn alloy standard by the aid of CalcZAF software. It is shown that the error caused by Kβ fluorescence exceeds 4% for the Fe–0.53% Mn alloy. The problem can be overcome by utilizing CalcZAF in which β-line fluorescence has been included, or by employing a similar standard Fe–0.85% Mn for Mn in the absence of β-line fluorescence correction. In addition, a modified calibration curve method, using k-values instead of X-ray intensity as a variable, is presented and used to measure the Mn concentration. The accuracy of this method is as good as or better than that of the conventional matrix correction method. Compared with conventional calibration curve methods, it is time-saving because the k-value is not sensitive to instrument fluctuations and the established curve remains valid for a long period.

Quantitative high-resolution cathodoluminescence spectroscopy of smithsonite

2004 ◽  
Vol 68 (1) ◽  
pp. 199-207 ◽  
Author(s):  
T. Götte ◽  
D. K. Richter
Keyword(s):  
Trace Elements ◽  
Chemical Composition ◽  
High Resolution ◽  
Linear Correlation ◽  
Matrix Effects ◽  
Weight Fraction ◽  
Quenching Effect ◽  
Cathodoluminescence Spectroscopy ◽  
Mn Content ◽  
Mn Concentration

AbstractFive smithsonite samples from locations in Germany, Mexico and Namibia have been investigated with cathodoluminescence (CL) spectroscopy and trace-element analyses. As with other carbonates, the CL properties of smithsonite are mainly controlled by Mn2+- and Fe2+-incorporation, because these elements are the most important activator and quencher species, respectively. Additional trace elements may have either a quenching effect (Cu) or have only small or no influence (Ca, Pb). A linear correlation exists between the Mn content and the intensity of the Mn-emission band in smithsonite, which can be quantified, if the Cl intensity is related to the number of moles of Mn rather than the weight fraction. A correlation between the Cl intensity and the Mn concentration, which is valid for all trigonal carbonates, is obtained from the published results of calcite, dolomite and smithsonite. Matrix effects due to the different chemical composition of the carbonate minerals seem to be of lesser importance.

scholarly journals Transmission Electron Microscopy of Mn-doped KNN Ceramics

2013 ◽  
Vol 19 (S4) ◽  
pp. 99-100 ◽  
Author(s):  
M.A. Rafiq ◽  
M.E. Costa ◽  
I.M. Reaney ◽  
P.M. Vilarinho
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Domain Structure ◽  
Second Phase ◽  
Phase Assemblage ◽  
Electromechanical Properties ◽  
Transmission Electron ◽  
Ferroelectric Domains ◽  
Mn Content ◽  
Mn Concentration

Smart materials like piezoelectrics and ferroelectrics play a crucial role in applications such assensors and actuators,radio-frequency switching, drug delivery, chemicals detection, and power generation and storage. K0.5Na0.5NbO3 (KNN) is one of the leading lead free piezoelectric materials being considered as an alternativeto Pb(Zrx,Ti1-x)O3 (PZT), which is currently the most widely used material for electromechanical applications. Although pure KNN has inferior electromechanical properties compared to PZT,efforts are on going to tailor and improve its piezoelectric coefficients by doping and texturing.Although the piezoelectric constant (d33) of undoped KNN is unsuitable for practical electromechanical applications, properties comparable to PZT at room temperature (d33>400 pC/N) have been reported for modified KNN ceramics. Electromechanical properties are however, very much dependent on the crystalline phase content, crystallographic orientation, microstructure, interfaces and domain configuration.Mn is an indispensable dopant for both PbO-based as well as PbO-free ceramics like BaTiO3, SrTiO3, KNbO3 and KTaO3. It has been reported to improve the density, mechanical quality factor, electromechanical properties and to reduce dielectric loss. Mn has been successfully used to reduce the leakage current and lower the orthorhombic to tetragonal phase transition temperature (TO-T) in KNN single crystals. It has also been shown to improve the density and properties of KNN–LiTaO3–LiSbO3. However, the effect of Mn on the KNN domain structure and phase assemblage has not yet been reported. In this work, KNN ceramics doped with Mn on the B-site (Mn content was 0.5, 1.0. 1.5 and 2 mole%) were synthesized by a conventional mixed oxide method. Transmission electron microscopy (TEM)(Hitachi 9000) studies were carried out to analyse the effect of B-site Mn doping on the ferroelectric domain structure and phase assemblage.Undoped KNN ceramics had large grains (>30 >m) which contained large (>1 >m wide) wedge shaped ferroelectric domains. KNN doped with 0.5 mole % Mn exhibited a smaller grain size (~2 mm) in which a well defined domain structure was observed with widths approximately an order of magnitude smaller than those in undoped KNN. For KNN doped with 2 mole % Mn, the presence of a second phase, Figure 1c, was often observed. Electron diffraction patterns from the second phase were consistent with a tetragonal tungsten bronze (TTB) structured compound although more work is required to definitively determine the phase assemblage. The domain structure became increasing complex as Mn concentration increased, suggesting that the presence of Mn on the B-site disrupts polar order.In conclusion, TEM analysis demonstrated that Mn doping changes the domain structure of KNN ceramics: for low Mn content, well defined ferroelectric domains and for high Mn content, tangled domains and second phase were the main features.These microstructure details elucidate reasons that may account for the inferior piezoelectric properties of KNN at higher Mn concentration.

Sign in / Sign up

Export Citation Format

Share Document