In theperiodic table of the elements, arsenic is No. 33. An arsenic atom has 33 electrons and 33 protons with five valence electrons (those that can participate in forming chemical bonds with other electrons) in its outer shell. Arsenic is a crystallinemetalloidfound in the Earth's crust, b...
Though arsenic compounds were mined by the early Greek, Chinese and Egyptian civilizations, it is believed that the element itself was first identified by Magnus who stated that it has a metal-like nature. In the book De Mineralibus, he described how the metalloid could be produced by heating...
Arsenic standards we used: sodium arsenate at pH 8.2 (aqueous 1 M, Na2HAsO4 Á 7H2O; Sigma; CAS no. 10048-95-0), calcium arsenate (powder, As2Ca3O8; Alpha Chemicals; CAS no. 7778-44-1), pharmacolite (crushed mineral, CaHAsO4 Á 2(H2O), provided by the Mineral Collection of...
Further, amongst its inorganic forms, As(III) is more soluble and 60 times more toxic and mobile than As(V), as the former has been shown to react with sulfhydryl (–SH) groups of proteins and enzymes, culminating inhibition in cellular function and eventually cell death [21–26]. ...