نتایج جستجو برای: groundwater geochemistry
تعداد نتایج: 34087 فیلتر نتایج به سال:
At least 2.6 million small, artificial water bodies dot the landscape of the conterminous United States; most are in the eastern half of the country. These features account for approximately 20% of the standing water area across the United States, and their impact on hydrology, sedimentology, geochemistry, and ecology is apparently large in proportion to their area. These features locally eleva...
Over the years, groundwater has been used as a means of adaptation to seasonal and perennial scarcity surface water. Groundwater provides water for households, livestock, irrigation in semi-arid areas Tanzania. It is acknowledged that susceptible chemical other mineral contamination which not only poses threat health human beings livestock but also agriculture. However, potential terms its viab...
Cadmium occurs in the earth’s crust at a concentration of 0.1–0.5 ppm and is commonly associated with zinc, lead, and copper ores. It is also a natural constituent of ocean water with average levels between <5 and 110 ng/L, with higher levels reported near coastal areas and in marine phosphates and phosphorites. The cadmium concentration of natural surface water and groundwater is usually <1 μg...
Reductive bioremediation is currently being explored as a possible strategy for uranium-contaminated aquifers such as the Old Rifle site (Colorado). The stability of U(IV) phases under oxidizing conditions is key to the performance of this procedure. An in situ method was developed to study oxidative dissolution of biogenic uraninite (UO₂), a desirable U(VI) bioreduction product, in the Old Rif...
his fact sheet provides a summary of a review by the CCME Soil Quality Guidelines Task Group (SQGTG) of the implications of propylene glycol (PG) releases to Canadian soil environments. Following a review of the releases, fate and effects of PG in soils, the SQGTG opted not to develop Canadian soil quality guidelines at this time. Nonetheless, releases of PG to the environment can pose serious ...
Cadmium occurs in the earth’s crust at a concentration of 0.1–0.5 ppm and is commonly associated with zinc, lead, and copper ores. It is also a natural constituent of ocean water with average levels between <5 and 110 ng/L, with higher levels reported near coastal areas and in marine phosphates and phosphorites. The cadmium concentration of natural surface water and groundwater is usually <1 μg...
The exploitation of groundwater in arid and semi-arid areas, especially basins where is intensively exploited, likely to have adverse effects on the originally fragile ecological environment, which also greatly alter hydrogeochemical evolution process. Over-abstraction Haolebaoji watershed Ordos Basin located regions has led a series changes system, attracted considerable attention from environ...
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