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Selenium pollution of waterways also occurs when selenium is leached from coal flue ash, mining and metal smelting, crude oil processing, and landfill. [103] High selenium levels in waterways were found to cause congenital disorders in oviparous species, including wetland birds [104] and fish. [105]
These elements include vanadium, manganese, iron, cobalt, copper, zinc, selenium, strontium and molybdenum. [75] A deficiency of these essential metals may increase susceptibility to heavy metal poisoning. [76] Selenium is the most toxic of the heavy metals that are essential for mammals. [77]
Selenium is a naturally occurring element in the environment, and is an essential dietary nutrient. However, in high concentrations, selenium bioaccumulates to toxic levels in tissues and can cause reproductive failure and birth defects, or deposit in sediments. [15]
Name Location Dependent population Description Sources of pollution Impact Bharalu River: Assam, India: One of the most polluted rivers in the state of Assam. [19] The biochemical oxygen demand of the river is 52 mg/L in compared to the permissible limit set by the National River Conservation Directorate (NRCD) at 3 mg/L. [20]
Although there are ongoing studies of bioaccumulation in turtles, factors like pollution, climate change, and shifting landscape can affect the amounts of these toxins in the ecosystem. [17] The most common elements studied in turtles are mercury, cadmium, argon [dubious – discuss], and selenium. Heavy metals are released into rivers, streams ...
Increasing phosphorus and nitrogen can cause nutrient pollution. Selenium is toxic and can bioaccumulate. [58] [59] Land disturbance from forestry cutting, soil and bedrock displacement/removal and use of heavy machinery can decrease soil infiltration rate, terrestrial habitat and carbon sequestration, increase in runoff and sediment weathering ...
Wildlife in this region suffered deformities [1] due to selenium poisoning, drawing the attention of news media and leading to the closure of the refuge. [ 1 ] [ 2 ] Kesterson Reservoir was a unit of the refuge but is now part of San Luis National Wildlife Refuge .
Cancers are more common in MTR areas. A U.S. Geological Survey found high levels of the carcinogens aluminum and silica in air samples from MTR regions in Appalachia. The researchers also found traces of chromium, sulfate, selenium and magnesium in the air.These components of granite rock may elevate the risk of cancer through respiratory ...