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hyperaccumulators and contaminants : Al, Ag, As, Be, Cr, Cu, Mn, Hg, Mo, naphthalene, Pb, Se, Zn – accumulation rates ; Contaminant Accumulation rates (in mg/kg dry ...
The river water was contaminated with toxic metals including arsenic, copper, barium, cadmium, chromium, lead, mercury, nickel, and thallium. [2] Cleanup costs may exceed $1.2 billion. [3] A toxic heavy metal is a common but misleading term for a metal-like element noted for its potential toxicity. [4]
Hydrogen selenide is hazardous, being the most toxic selenium compound [3] and far more toxic than its congener hydrogen sulfide. The threshold limit value is 0.05 ppm. The gas acts as an irritant at concentrations higher than 0.3 ppm, which is the main warning sign of exposure; below 1 ppm, this is "insufficient to prevent exposure", while at ...
Swimming in water contaminated by the responsible pathogens Ear canal swells, causing pain and tenderness to the touch Salmonellosis: Caused by many bacteria of genus Salmonella: Drinking water contaminated with the bacteria. More common as a food borne illness. Symptoms include diarrhea, fever, vomiting, and abdominal cramps Typhoid fever
Selenium also occurs in organic compounds, such as dimethyl selenide, selenomethionine, selenocysteine and methylselenocysteine, all of which have high bioavailability and are toxic in large doses. Selenium poisoning of water systems may result whenever new agricultural runoff courses through normally dry, undeveloped lands. This process ...
Remediation methods have been investigated to extract selenocyanate from water. Methods considered include precipitation by metal salts, or extraction by plants. Indian mustard converts some selenocyanate to selenocystine and selenomethionine , and volatiles dimethylselenide and methylselenocyanate .
Selenium pollution might impact some aquatic systems and may be caused by anthropogenic factors such as farming runoff and industrial processes. [100] People who eat more fish are generally healthier than those who eat less, [101] which suggests no major human health concern from selenium pollution, although selenium has a potential effect on ...
The most common reason for long-term exposure is contaminated drinking water. [3] Groundwater most often becomes contaminated naturally; however, contamination may also occur from mining or agriculture. [1] It may also be found in the soil and air. [5] Recommended levels in water are less than 10–50 μg/L (10–50 parts per billion). [1]