Influence of emission from copper–nickel smelters on the chemical composition of lake water: Acidification forecast

2017 ◽  
Vol 476 (1) ◽  
pp. 1073-1079 ◽  
Author(s):  
N. A. Gashkina ◽  
T. I. Moiseenko
Keyword(s):  
Chemical Composition ◽  
Lake Water ◽  
Water Acidification ◽  
Copper Nickel

scholarly journals Lake water and talik groundwater interaction in continuous permafrost, Central Yakutia

2019 ◽  
Vol 98 ◽  
pp. 07024
Author(s):  
Nadezhda Pavlova ◽  
Liudmila Lebedeva ◽  
Vladimir Efremov
Keyword(s):  
Chemical Composition ◽  
Air Temperature ◽  
Lake Water ◽  
Structural Features ◽  
Downward Trend ◽  
Hydrological Data ◽  
Hydrochemical Data ◽  
Continuous Permafrost ◽  
Solids Content ◽  
Winter Air Temperature

Structural features of a lake talik associated with eolian relief are discussed. Analysis of hydrochemical and hydrological data for 2010-2017 showed that talik groundwater feeds lake and maintains perennial outflow from the lake. Variations in the chemical composition of the lake and outflowing creek are characterized on an annual and interannual basis. Seasonal comparison of hydrochemical data indicates a downward trend in dissolved-solids content of the lake water over the last six years, suggesting an increasing contribution of suprapermafrost groundwater to the lake and lake talik. Probable reason of enhanced suprapermafrost flow is increase of its duration due to observed rise of winter air temperature.

scholarly journals Effect of Humic Substance Photodegradation on Bacterial Growth and Respiration in Lake Water

2005 ◽  
Vol 71 (10) ◽  
pp. 6267-6275 ◽  
Author(s):  
Alexandre M. Anesio ◽  
Wilhelm Granéli ◽  
George R. Aiken ◽  
David J. Kieber ◽  
Kenneth Mopper
Keyword(s):  
Chemical Composition ◽  
Humic Substance ◽  
Bacterial Growth ◽  
Lake Water ◽  
Standard Error ◽  
Growth Efficiency ◽  
Bacterial Respiration ◽  
Growth Respiration ◽  
Biological Substrates ◽  
Highly Correlated

ABSTRACT This study addresses how humic substance (HS) chemical composition and photoreactivity affect bacterial growth, respiration, and growth efficiency (BGE) in lake water. Aqueous solutions of HSs from diverse aquatic environments representing different dissolved organic matter sources (autochthonous and allochthonous) were exposed to artificial solar UV radiation. These solutions were added to lake water passed through a 0.7-μm-pore-size filter (containing grazer-free lake bacteria) followed by dark incubation for 5, 43, and 65 h. For the 5-h incubation, several irradiated HSs inhibited bacterial carbon production (BCP) and this inhibition was highly correlated with H2O2 photoproduction. The H2O2 decayed in the dark, and after 43 h, nearly all irradiated HSs enhanced BCP (average 39% increase relative to nonirradiated controls, standard error = 7.5%, n = 16). UV exposure of HSs also increased bacterial respiration (by ∼18%, standard error = 5%, n = 4), but less than BCP, resulting in an average increase in BGE of 32% (standard error = 10%, n = 4). Photoenhancement of BCP did not correlate to HS bulk properties (i.e., elemental and chemical composition). However, when the photoenhancement of BCP was normalized to absorbance, several trends with HS origin and extraction method emerged. Absorbance-normalized hydrophilic acid and humic acid samples showed greater enhancement of BCP than hydrophobic acid and fulvic acid samples. Furthermore, absorbance-normalized autochthonous samples showed ∼10-fold greater enhancement of BCP than allochthonous-dominated samples, indicating that the former are more efficient photoproducers of biological substrates.

scholarly journals Lake water acidification and temperature have a lagged effect on the population dynamics of Isoëtes echinospora via offspring recruitment

2016 ◽  
Vol 70 ◽  
pp. 420-430 ◽  
Author(s):  
Martina Čtvrtlíková ◽  
Josef Hejzlar ◽  
Jaroslav Vrba ◽  
Jiří Kopáček ◽  
Jiří Nedoma ◽  
...  
Keyword(s):  
Population Dynamics ◽  
Lake Water ◽  
Water Acidification ◽  
Lagged Effect

Spruce and surface water acidification: an extended summary

1990 ◽  
Vol 327 (1240) ◽  
pp. 371-372 ◽  
Keyword(s):  
Surface Water ◽  
Lake Water ◽  
Agricultural Science ◽  
Soil Conditions ◽  
Spruce Forest ◽  
Water Acidification ◽  
Surface Water Acidification ◽  
Forest Survey ◽  
Open Land ◽  
South Sweden

It has been proposed that vegetation and soil changes resulting from changes in land use cause surface-water acidification. The expansion of spruce forest, from natural colonization and from afforestation, has been one of the major changes that has taken place in the vegetation of South Sweden during this century. Spruce has been favoured at the expense of broad-leafed trees by forest management and has been planted on open land, abandoned farm land and in forests. Since the 1920s, the area covered by spruce forest has increased by 2.3 million haf in Gotaland and Svealand, and the frequency of spruce trees in the forests has increased from 11.5 to 33.5% (data from Department of Forest Survey, Swedish University of Agricultural Science, Umea). Gotaland and Svealand comprise the southernmost third of Sweden, the area that suffers most from lake acidification. Spruce colonization alters soil conditions. In several investigations, in which conditions in spruce and birch stands have been compared, significantly lower pH values have been recorded in spruce forest soils. It has been suggested that spruce expansion also leads to lake-water acidification, but this has not been confirmed. Unfortunately, it is difficult to design an investigation aimed at studying the acidification effects of spruce forest under prevailing levels of atmospheric pollution because there are problems in distinguishing between true vegetation-soil effects, effects of air pollution, and combined effects. To assess whether spruce forest per se causes lake-water acidification, we have studied the effects of the natural immigration of spruce that reached northern Sweden from the northeast about 3000 years ago, before there was any acid precipitation from fossil-fuel combustion. Palaeoecological studies indicate that spruce colonized land that was occupied by birch, alder and pine.

Development and Application of Series Re-Calibration Samples of Copper and Copper Alloy

2012 ◽  
Vol 503-504 ◽  
pp. 511-515
Author(s):  
Yue Hong Li ◽  
Huai Bao Yuan
Keyword(s):  
Chemical Composition ◽  
Reference Materials ◽  
Copper Alloy ◽  
Control Analysis ◽  
Direct Reading ◽  
Copper Nickel ◽  
Distribution Of Elements ◽  
Calibration Samples ◽  
Technical Specifications ◽  
Control Samples

In accordance with the requirements of the reference materials technical specifications, refer to some countries’ existing standards of chemical composition of copper and copper products, design the chemical composition of each re-calibration samples. Using proper methods of batching, smelting technique and extrusion processes etc., developed a set of re-calibration samples of copper and copper alloy. These samples are mainly used for standardization of photoelectric direct reading spectrometer instrument, to meet the re-calibration of various elements of Cu, Pb, Fe, Ni, Bi, Sb, P, As, Al, Zn, Mn, Si, Sn, Cr, Cd, Zr, Mg, S, C, Ag, Co, Se, Te in the copper, brass, bronze, copper-nickel and other copper alloy. Determine the content of the various elements using a variety of methods, these samples can also act as control samples for the control analysis of the relevant elements separately. In comparison with existing international re-calibration samples, the series of samples have advantages of small quantity, wide coverage, more reasonable distribution of elements.

scholarly journals Physical and Chemical Composition of Water in Lake Kara-Kir

2021 ◽  
Vol 13 ◽  
Author(s):  
Odilova Makhfuza
Keyword(s):  
Chemical Composition ◽  
Lake Water ◽  
High Concentration ◽  
Physicochemical Composition ◽  
Chemical Composition Of Water ◽  
Physical And Chemical

Lake Kara-kir is located in the northwest of the Bukhara oasis. The total area of the lake is 26.5-27.2 thousand hectares. The physicochemical composition of lake water changes depending on the seasons of the year. the fact that the amount of chlorides contained in water is 3.6 - 3.7 g / l, and sulfates in high concentration 5.0 - 5.2 g / l, indicates that the degree of salinity occurs due to chloride -sulphates. The readings for dissolved cislarod in water vary, mainly depending on the intensity of photosynthesis and aeration of the water

scholarly journals Chemistry of Bottom Sediments from Selected Karst Lakes in the Vicinity of Staszów (Nida Basin)

2020 ◽  
Vol 20 (2) ◽  
pp. 81-87
Author(s):  
Artur Zieliński ◽  
Adam Choiński ◽  
Sylwia Machula ◽  
Agnieszka Ławniczak ◽  
Agnieszka Strzelczak
Keyword(s):  
Comparative Analysis ◽  
Chemical Composition ◽  
Bottom Sediments ◽  
Lake Water ◽  
Chemical Elements ◽  
Field Investigation ◽  
Organic Substances ◽  
Karst Lakes ◽  
Wide Range ◽  
Measurement Results

AbstractThe aim of this study was to reveal the chemical composition of bottom sediments in karst lakes located in the northern part of Połaniec Basin (eastern part of the Nida Basin, vicinity of Staszów municipality). A field investigation was carried out in 2010 on four lakes: Duży Staw, Donica, Dziki Staw and Łajba. The contents of a very wide range of chemical elements were determined, which is a rarity. On the basis of our research, it was found that the analysed lakes differed considerably between each other in spite of their close location. In general, sediments contained fair amounts of organic substances as well as Fe, Al, Ca and Mg due to the type of source rock and soligenic lake water supply. Increased concentrations of V, Cr and Ni might be explained by the weathering of rock material. In turn, higher contents of Zn, Pb, Cu and Co in the bottom sediments from Duży Staw indicated anthropopression. The measurement results obtained in this study will allow a future comparative analysis with bottom sediments from other lakes.

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