نتایج جستجو برای: surface waters
تعداد نتایج: 666141 فیلتر نتایج به سال:
The occurrence of Campylobacter spp was examined in a variety of waters in Northern Ireland. Conventional cultural techniques were employed with 768 water specimens, including drinking waters (tap, spring, bore hole and bottled) and recreational waters (swimming pool, lough, river and sea). Positive waters included 1/11 (9.1%) drinking water from untreated well water, as well as 5/12 (41.7%) un...
This paper reviews the current state of knowledge on illicit drugs as emerging environmental contaminants. Several studies have recently reported that illicit drugs are detectable in wastewater from municipal sewage treatment plants (STPs) and surface waters. These substances are excreted in urine and faeces unchanged or as active metabolites in high percentages after consumption and continuous...
Acidification remediation alternatives: exploring the temporal dimension with cost benefit analysis.
Acidification of soils and surface waters caused by acid deposition is still a major problem in southern Scandinavia, despite clear signs of recovery. Besides emission control, liming of lakes, streams, and wetlands is currently used to ameliorate acidification in Sweden. An alternative strategy is forest soil liming to restore the acidified upland soils from which much acidified runoff origina...
The behaviour of fossil organisms can typically be inferred only indirectly, but rare fossil finds can provide surprising insights. Here, we report from the Eocene Messel Pit Fossil Site between Darmstadt and Frankfurt, Germany numerous pairs of the fossil carettochelyid turtle Allaeochelys crassesculpta that represent for the first time among fossil vertebrates couples that perished during cop...
Abundant shallow saline lakes on the Archean Yilgarn Craton in southern Western Australia exhibit a rare spectrum of geochemical conditions. Here the field geochemistry over three seasons (pH, salinity, and temperature), as well as major ions, trace elements, and H, O, and S stable isotopes of surface waters and shallow groundwaters from 59 ephemeral lakes in southern Western Australia (WA) are...
Seasonal variations of the seawater properties (e.g. temperature, salinity, density and chlorophyll-a) in western part of the southern coastal waters of the Caspian Sea near the Iranian coast were studied. A portable CTD probe was applied for profiling from sea surface to bottom at 23 stations. Maximum depth of the profiling stations was more than 470 m in the study area. Vertical structure of ...
Mineralogy and specific surface area are major controls on the stabilities of ferric oxyhydroxide microparticles in natural waters. The thermodynamic stabilities of ferric oxyhydroxides, as described by the activity product in solution pK = -log [Fe(3+)] [OH(-)](3) range from pK = 37.1 for freshly precipitated amorphous oxyhydroxide to pK = 44.2 for well crystallized goethite. The sizes of susp...
Substantial CO2 degassing occurs from geothermal waters in Turkey as evident from ongoing deposition of recent terrace travertines and emplacement of significant travertine vein and breccia deposits representing hydrothermal eruption products. Geochemical data indicate rapid ascent of CO2bearing fluids without significant interaction with basement and host rocks. High-precision U-series dates o...
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