Methyl mercury formation and distribution in a polluted river—lake system: the effect of environmental variables, and implications for biological uptake and lake restoration

ABSTRACTThe geographic position, astronomic factors (e.g. the Earth’s maximum distance from the Sun during winter), ice cover and altitude are the main factors affecting the climate of the Antarctic, which is the coldest place on Earth. Parts of Antarctica are facing the most rapid rates of anthropogenic climate change currently seen on the planet. Climate changes are occurring throughout Antarctica, affecting three major groups of environmental variables of considerable biological significance: temperature, water, UV-B radiation.Low diversity ecosystems are expected to be more vulnerable to global changes than high diversity ecosystems

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EFFECT OF ENVIRONMENTAL VARIABLES ON FINANCIAL PERFORMANCE: THE CASE OF ELECTRICAL INDUSTRY

Environmental Engineering and Management Journal ◽

10.30638/eemj.2013.249 ◽

2013 ◽

Vol 12 (10) ◽

pp. 1995-2000

Author(s):

Maria del Mar Miras-Rodriguez ◽

Bernabe Escobar-Perez

Keyword(s):

Financial Performance ◽

Environmental Variables ◽

Electrical Industry

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Sustainability: Incorporating Social and Environmental Variables in the Analysis of Credit in Brazil

SSRN Electronic Journal ◽

10.2139/ssrn.2201630 ◽

2012 ◽

Author(s):

Luiz C. J. Perera ◽

Aida Maria M. Milani ◽

Roberto Borges Kerr ◽

Marco Antonio F. Milani Filho

Keyword(s):

Environmental Variables

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Evaluation of Toxicity in Receiving Streams

Water Science & Technology ◽

10.2166/wst.1992.0736 ◽

1992 ◽

Vol 26 (9-11) ◽

pp. 2357-2360

Author(s):

J. Zagorc-Koncan ◽

M. Dular

Keyword(s):

Dissolved Oxygen ◽

Toxic Substances ◽

Toxicity Evaluation ◽

Copper Cyanide ◽

Polluted River ◽

Design Information ◽

Point Of Entry ◽

Receiving Stream ◽

The Impact

A laboratory river model for the study of self-purification inhibition in a stream containing toxic substances is presented. It enables an engineering - technological prediction of the impact of toxic substances or wastewaters on dissolved oxygen (DO) profile in an organically polluted river downstream from the point of entry of toxic effluent thus providing rapidly and inexpensively significant design information to an environmental scientist or engineer. The method was applied to the toxicity evaluation of wastewaters from electroplating industry. The effects of copper, cyanide (representing two significant constituents of this type of wastewaters) and wastewater from electroplating industry on the biodegradation of organic municipal pollution in receiving stream were evaluated experimentally.

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Methyl mercury in the dutch rhine delta

Water Science & Technology ◽

10.2166/wst.1994.0530 ◽

1994 ◽

Vol 30 (10) ◽

pp. 213-219 ◽

Cited By ~ 2

Author(s):

Hendrik Pieters ◽

Victor Geuke

Keyword(s):

Suspended Matter ◽

Methyl Mercury ◽

Mercury Contamination ◽

Benthic Organisms ◽

Considerable Decrease ◽

Continuous Sedimentation ◽

Highly Correlated ◽

High Level ◽

Almost All

Samples of yellow eel from various locations in the Dutch Rhine area have been analyzed for trend monitoring of mercury since 1977. In the western Rhine delta mercury levels in eels have hardly changed since the seventies, whereas in the eastern part of the Dutch Rhine area a considerable decrease of mercury concentrations in eel has occurred. Because of continuous sedimentation of contaminated suspended matter transported from upstream regions, accumulation rates and concentrations of mercury in eel in the western Rhine delta remained at a relatively high level. Analyses of methyl mercury in biota have been performed to elucidate the role of methyl mercury in the mercury contamination of the Dutch Rhine ecosystem. Low percentages of methyl mercury were observed in zooplankton (3 to 35%). In benthic organisms (mussels) percentages of methyl mercury ranged from 30 to 57%, while in fish species and liver of aquatic top predator birds almost all the mercury was present in the form of methyl mercury (> 80%). During the period 1970-1990 mercury concentrations of suspended matter in the eastern Rhine delta have drastically decreased. These concentrations seemed to be highly correlated with mercury concentrations of eel (R = 0.84). The consequences of this relation are discussed.

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