Free Arsenic Essays and Papers

The symbol “As” from the periodic table, belongs to the chemical element Arsenic. Its located in group 15, period 4, and is clasificat as semi-metals. Arsenic’s atomic number is 33, and has a density of 5.776 grams per cubic centimeter. Arsenic melting point is 1090 K (817°C or 1503°F) and the boiling point is 887 K (614°C or 1137°F). The element specific gravities are 1.97 and 5.73, they are respectively to his two solid modifications: yellow, and grey (or metallic). Arsenic’s appearance is steel

A huge fascination of arsenic started in the 19th century when people got word of a province in southeastern Austria where people ate arsenic. Women would eat arsenic to help gain weight and fix their complexion to look more beautiful and men would eat arsenic because they believed it helped them breath easier when they were climbing high up in the mountains. One doctor by the name of Dr. Robert Craig MacLagan, was particularly interested in this and visited the town to see for himself what was really

Background/Introduction Arsenic is a naturally occurring element that has been known to be a very toxic poison for hundreds of years. This metalloid has properties of metals and nonmetals. It has two forms, the organic forms including arsenobetaine, arsenocholine, MMA and DMA and the inorganic forms including As (III) and As(V). This poison can be dated as far back as 3000 years ago in Chinese medicine that is still used today. Egyptians used arsenic as a way to harden copper and as embalming fluid

cofactor in the methylation process of arsenic and assists in transforming MMA to DMA, but this has been disproven by some reasearchers. There are two different mechanisms for arsenic methylation: Classical pathway (oxidative methylation) and Glutathione conjugation pathway (reductive methylation). In oxidative methylation, proposed by Challenger, arsenic comes together with a methyl group to create neutral methylated arsenicals like (MMAV) and (DMAV). The arsenic-sulfur compounds are replaced with unconjugated

Arsenic Element 33: Arsenic Abstract Arsenic is element 33 on the periodic table and is in Group 15. Arsenic is obviously an extremely poisonous element; however, some people have found arsenic to have a restorative effect on them. Chemically, arsenic is a metalloid. Two common forms of arsenic are gray and yellow. (see Figure 1-A) Element 33 has an atomic weight of 74.9216 and the chemical symbol of As. It boils at 613ºC, melts at 817ºC, and has a density of 5.72. (see Figure 2-A)

Arsenic Accumulation By Hemanth Ande   Research Plan A. Specific Aims Arsenic is a common element that has been part of the human civilization for more than 2000 years. It has been used as medicine in the western and eastern world in ways that would not be sanctioned today. In modern times Arsenic is used in agricultural, medical use and industrial use. Although it is considered a toxic compound in high dose, humans are exposed to the compound every day. Currently there is no comprehensive report

Arsenic, a heavy metal with an unknown biological function, is widely acknowledged for its biological toxicity in human health. The occurrence of Arsenic in the immediate environment comes both as a result of natural (e.g. naturally contaminated groundwater) and artificial (e.g. percolation of water from mines) causes. Arsenic is a highly occurring contaminant in groundwater in many areas of the world. These include countries such as Cambodia, Argentina, Chile, Hungary, Mexico, Bangladesh and the

clouds of gas killing 5,000 soldiers and putting 1,500 more out of the war. This caused great panic because nothing like this had happened before and wasn't expected by the allies. Previous to this event in the Middle Ages they used such things as arsenic and more natural things as chemicals which were as powerful as the chlorine gas ended up being in WWI. Chemical weapons were used many times after the Germans used chlorine gas in WWI, chlorine, phosgene, benzyl bromide, hydrogen cyanide, and then

advanced in the 5th century BC by Empedocles—that all things are composed of air, earth, fire, and water—was influential in alchemy. The Roman emperor Caligula is said to have instituted experiments for producing gold from orpiment, a sulfide of arsenic, and the emperor Diocletian is said to have ordered all Egyptian works concerning the chemistry of gold and silver to be burned in order to stop such experiments. Zosimus the Theban (about AD 250-300) discovered that sulfuric acid is a solvent of

Long term exposure to these particles causes tumor growth. The cancer causing chemicals that are present in the particles are called polynuclear aromatic hydrocarbons. Other cancer causing chemicals emitted during diesel combustion are benzene, arsenic and formaldehyde. (Pegg) The particles have also been linked to increases in asthma in children who are living in areas with high truck traffic. The particles bind with pollen in the air increasing the allergic reaction. Children are especially