نتایج جستجو برای: trace metal

تعداد نتایج: 260303  

Journal: :Environmental geochemistry and health 2012
Kakolee Banerjee B Senthilkumar R Purvaja R Ramesh

Four sediment cores were collected from selected locations of Sundarbans mangroves and Hooghly estuary, northeast coast of India to establish (210)Pb geochronology and trace metal distribution in sediments. Core sites were chosen to reflect a matrix of variable anthropogenic input and hydrological conditions. The vertical distribution of (210)Pb(xs) ((210)Pb(total)-(226)Ra) provided reliable ge...

Journal: :Environmental science. Processes & impacts 2014
Dorothea Hug Peter Emmanuel Castella Vera I Slaveykova

Elimination of sediments from river reservoirs is a common management problem for hydroelectric power plants. Periodical flushing can have negative impacts downstream. This study investigated the impact of a flushing event on the physico-chemical changes in the downstream sections and on the consequences for the benthic macroinvertebrate community. A special emphasis was placed on trace metal f...

Journal: :Environmental toxicology and chemistry 2010
Travis S Schmidt William H Clements Katharine A Mitchell Stanley E Church Richard B Wanty David L Fey Philip L Verplanck Carma A San Juan

Two toxic-unit models that estimate the toxicity of trace-metal mixtures to benthic communities were compared. The chronic criterion accumulation ratio (CCAR), a modification of biotic ligand model (BLM) outputs for use as a toxic-unit model, accounts for the modifying and competitive influences of major cations (Ca²(+), Mg²(+), Na(+), K(+), H(+)), anions (HCO₃⁻, CO²⁻₃ ,SO²⁻₄, Cl⁻, S²⁻) and dis...

2012
Josko Osredkar Natasa Sustar

The human body has an elaborate system for managing and regulating the amount of key trace metals circulating in blood and stored in cells. Nutrient metals from our diet are incorporated into blood if blood levels are depleted, transported into cells if cellular levels are inadequate, or excreted if blood and cell levels are sufficient or overloaded. When this system fails to function properly,...

2012
Josko Osredkar Natasa Sustar

The human body has an elaborate system for managing and regulating the amount of key trace metals circulating in blood and stored in cells. Nutrient metals from our diet are incorporated into blood if blood levels are depleted, transported into cells if cellular levels are inadequate, or excreted if blood and cell levels are sufficient or overloaded. When this system fails to function properly,...

Journal: :Environmental Health Perspectives 1995

Journal: :OnLine Journal of Biological Sciences 2008

Journal: :Chemical communications 2007
Nanfeng Zheng Galen D Stucky

A trace amount of metal carbonate, acetate or borate significantly boosts gold nanocatalysts in selective aerobic oxidation of alcohols under mild solvent-free conditions.

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