Mercury and Selected Trace Elements from a Remote (Gosainkunda) and an Urban (Phewa) Lake Waters of Nepal

2015 ◽  
Vol 226 (2) ◽  
Author(s):  
Chhatra Mani Sharma ◽  
Shichang Kang ◽  
Mika Sillanpää ◽  
Qing Li ◽  
Qianggong Zhang ◽  
...  
Keyword(s):  
Trace Elements ◽  
Lake Waters

scholarly journals Detecting trends in freshwater trace element concentrations: methodological issues and data treatment

2018 ◽  
Vol 1 (2) ◽  
pp. 87-98 ◽  
Author(s):  
Juan Carlos Rodríguez-Murillo ◽  
Pascale Nirel ◽  
Montserrat Filella
Keyword(s):  
Trace Elements ◽  
Trace Element ◽  
Statistical Significance ◽  
Temporal Trends ◽  
Monitoring Program ◽  
Data Treatment ◽  
Wide Range ◽  
Lake Waters ◽  
Program Data ◽  
Difficult Issue

Abstract Despite the fact that the increased use of elements linked to the Anthropocene is frequently assumed to lead to an increase in the concentrations of the elements in surface waters, temporal trends of trace element (TE) concentrations have rarely been checked. A temporally extended, traceable dataset of TE concentrations in the waters of Lake Geneva, Switzerland (1996–2015) has been used here to explore methodological and data treatment issues that arise when attempting to rigorously determine temporal trends in freshwater TE concentrations. The trace elements studied (Cd, Co, Gd, Mo, Pb, Sb, Sr) have been chosen to cover a wide range of chemical and utilisation conditions. We show that detecting temporal trends from monitoring program data is feasible, even when trends are weak, provided that rigorous data treatment methods are applied. Aspects related to the effect of data quality are discussed in detail. However, ascertaining the statistical significance of any trends calculated remains a difficult issue. With the exception of Co and Sr, that show no significant changes, and Pb, that shows a general decrease, concentrations in lake waters of the trace elements considered have increased significantly, particularly between 2006 and 2015.

scholarly journals Linking environmental observations and solid solution thermodynamic modeling: the case of Ba- and Sr-rich micropearls in Lake Geneva

2017 ◽  
Vol 89 (5) ◽  
pp. 645-652 ◽  
Author(s):  
Bruno Thien ◽  
Agathe Martignier ◽  
Jean-Michel Jaquet ◽  
Montserrat Filella
Keyword(s):  
Solid Solution ◽  
Trace Elements ◽  
Thermodynamic Modeling ◽  
Lake Geneva ◽  
Calcium Carbonates ◽  
Lake Waters ◽  
Non Equilibrium

AbstractIntracellular inclusions of amorphous Ba- and Sr-rich calcium carbonates – referred to as “micropearls”– have recently been detected in Lake Geneva. These micropearls are formed under conditions of pronounced Ba and Sr undersaturation in the lake waters. Their formation can be explained by the ability of certain microorganisms to preconcentrate these trace elements in tandem with a non-equilibrium solid-solution growing mechanism.

scholarly journals Trace elements in nature water of the Naryksko-Ostashkinskaya area (Kuzbass, Russia)

2019 ◽  
Vol 98 ◽  
pp. 07015
Author(s):  
Olesya Lepokurova ◽  
Eugenia Domrocheva
Keyword(s):  
Trace Elements ◽  
Coalbed Methane ◽  
Trace Element Composition ◽  
Element Composition ◽  
River Waters ◽  
Underground Waters ◽  
Coal Deposits ◽  
Concentration Dependences ◽  
Coalbed Methane Production ◽  
Lake Waters

This paper presents data on the trace element composition of lake waters, river waters and groundwater in the area of coalbed methane production. The concentration dependences of some components on the mineralization, organic matter and depth are revealed. It is shown that underground waters of coal deposits are most enriched in microelements.

Geochemical Trends of Trace Elements Concentration in Saline Lakes of Central Asia

2015 ◽  
Vol 1085 ◽  
pp. 148-153 ◽  
Author(s):  
Olga Gaskova ◽  
Marina Kolpakova ◽  
Vitaly Isupov ◽  
Alexander Vladimirov ◽  
Stepan Shvartsev ◽  
...  
Keyword(s):  
Trace Elements ◽  
Trace Element ◽  
Large Range ◽  
Soda Lakes ◽  
Soda Lake ◽  
Arsenic Species ◽  
Low Salinity ◽  
Element Concentrations ◽  
High Concentrations ◽  
Lake Waters

The investigated Mongolian lakes are marked by a large range of trace element concentrations even in very small geographical areas. This work includes the data on major and trace element concentrations along of a series of samples collected in 2009 and 2012. Three geochemical types of lakes have been distinguished within the study area: (1) alkaline soda lakes, (2) chloride lakes with pH < 9.0 and Na-Cl-dominated composition, and (3) sulfate ones with pH < 8. The soda lakes show high concentrations of As, U, F and relatively low salinity. The chloride lakes have higher salinities and one of them was the most saline of all the lakes (Davsan Nuur). These lakes have higher concentrations of Li (up to 82.1 mg/L), Rb (up to 1350 mg/L), Br and Sr. Sulfate rich lakes are far less common in the area. Characteristic trace elements are Mo, Al and Sr. Thermodynamic modeling at 25°C and 1 bar total pressure was performed with the “HCh” code. We considered mineral and solution equilibria in soda lake waters and calculated the main uranium and arsenic species in solutions and bottom sediments of Shaazgay-Nuur lake to offer a possible way of As removal as an undesirable impurity in commercial products.

Survey of trace elements in lake waters of Finnish Lapland using the ICP-MS technique

1995 ◽  
Vol 160-161 ◽  
pp. 433-439 ◽  
Author(s):  
Jaakko Mannio ◽  
Olli Ja¨rvinen ◽  
Riitta Tuominen ◽  
Matti Verta
Keyword(s):  
Trace Elements ◽  
Finnish Lapland ◽  
Icp Ms ◽  
Lake Waters

Microanalytical Identification of a New Zr-Nb-Fe Phase

1990 ◽  
Vol 48 (2) ◽  
pp. 132-133
Author(s):  
O.T. Woo ◽  
G.J.C. Carpenter
Keyword(s):  
Trace Elements ◽  
Cold Rolling ◽  
Proportionality Factor ◽  
Tube Material ◽  
X Ray ◽  
Metal Foils ◽  
Arc Melting ◽  
Intermetallic Particles ◽  
Intermetallic Precipitates ◽  
Cold Worked

To study the influence of trace elements on the corrosion and hydrogen ingress in Zr-2.5 Nb pressure tube material, buttons of this alloy containing up to 0.83 at% Fe were made by arc-melting. The buttons were then annealed at 973 K for three days, furnace cooled, followed by ≈80% cold-rolling. The microstructure of cold-worked Zr-2.5 at% Nb-0.83 at% Fe (Fig. 1) contained both β-Zr and intermetallic precipitates in the α-Zr grains. The particles were 0.1 to 0.7 μm in size, with shapes ranging from spherical to ellipsoidal and often contained faults. β-Zr appeared either roughly spherical or as irregular elongated patches, often extending to several micrometres.The composition of the intermetallic particles seen in Fig. 1 was determined using Van Cappellen’s extrapolation technique for energy dispersive X-ray analysis of thin metal foils. The method was employed to avoid corrections for absorption and fluorescence via the Cliff-Lorimer equation: CA/CB = kAB · IA/IB, where CA and CB are the concentrations by weight of the elements A and B, and IA and IB are the X-ray intensities; kAB is a proportionality factor.

XRMF applications of a monolithic, polycapillary, focusing x-ray optic

1996 ◽  
Vol 54 ◽  
pp. 240-241
Author(s):  
D. A. Carpenter ◽  
Ning Gao ◽  
G. J. Havrilla
Keyword(s):  
Trace Elements ◽  
Point Source ◽  
Focal Spot ◽  
Fluorescence Analysis ◽  
X Rays ◽  
Focal Distance ◽  
Spot Diameter ◽  
X Ray ◽  
Focal Spot Diameter

A monolithic, polycapillary, x-ray optic was adapted to a laboratory-based x-ray microprobe to evaluate the potential of the optic for x-ray micro fluorescence analysis. The polycapillary was capable of collecting x-rays over a 6 degree angle from a point source and focusing them to a spot approximately 40 µm diameter. The high intensities expected from this capillary should be useful for determining and mapping minor to trace elements in materials. Fig. 1 shows a sketch of the capillary with important dimensions.The microprobe had previously been used with straight and with tapered monocapillaries. Alignment of the monocapillaries with the focal spot was accomplished by electromagnetically scanning the focal spot over the beveled anode. With the polycapillary it was also necessary to manually adjust the distance between the focal spot and the polycapillary.The focal distance and focal spot diameter of the polycapillary were determined from a series of edge scans.

Trace Elements and Iron in Human Metabolism

1979 ◽  
Vol 7 (6) ◽  
pp. 1330-1331
Author(s):  
E. D. WILLS
Keyword(s):  
Trace Elements ◽  
Human Metabolism
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