Leg Weakness â Causes and Treatment. Leg weakness is a serious symptom which is commonly ignored by many people. Leg weakness is highly based on ones own perception, so many people may not even realize that they have leg weakness. However, for practical purposes it is the first sign of paralysis because of nerve compression in the lower back. Leg weakness is frequently accompanied by loss of touch sensation and shooting pain, which generally come before the leg weakness.
Description: Arsenic's name comes from the Greek term for an arsenic compound, orpiment (arsenic trisulfide). Arsenic is a metalloid element, which, like phosphorus, has two main forms. One is a brittle, gray metallic form and the other is a yellow, non-metallic solid.Yellow arsenic is the more reactive and unstable of the pair. Arsenic is stable, being unaffected by air, water, most acids and alkalis.Arsenic has no liquid phase; the solid sublimes directly into a vapor.rsenic has semiconductor properties and is used in making transistors. It is also used in alloys, glass production, pyrotechnics and wood preservatives. An arsenic-gallium compound is used in making lasers.
icity and transport properties of arsenic strongly depend on their chemical form. The forms of arsenic occur with valance states of â3, 0, 3, and 5. Most arsenic exists as arsenite (AsO3 3, As(III)) and arsenate (AsO3 4, As(V)) in water [3], and As(III) is more toxic than As(V). Meanwhile, selenium is a natural trace element, known to be an essential nutrient for animals and humans. Selenium contamination in drinking water is currently of concern because of the narrow range between selenium deï¬ciency and toxicity to humans [4,5]. Selenium is introduced into water from various sources including agricultural activities, fossil fuel combustion, and other industrial efï¬uents [6]. Selenium exists in valance state of â2, 0, 4, and 6 and has several organic forms [7]. Because higher valance forms of selenium are more water soluble, selenite (SeO2 3, Se(IV)) and selenate (SeO 2 4, Se(VI)) are the predominant forms found in water, and Se(IV) is more toxic than Se(VI) [5,8]. The United States Environmen-tal Protection Agency has established the maximum