Another compound is used in soap in combination with fatty acids. The most common compound of sodium is sodium chloride, or table salt. A compound of sodium was used as a headache remedy in Medieval Europe. This soft, waxy, silvery, reactive metal was isolated in 1807 by Sir Humphry Davy, though it had been recognized in compounds long before. Exposure of glass to higher energy electrons (few hundred eV or higher) may causeÄiffusion of Na into bulk or across the surface out of the irradiated area.Glass materials may exhibit increased amount of sodium at the surface due to diffusion.The presence of sodium, especially with the presence of chlorine and an intense hydrocarbonĬ1s peak can indicate contamination from manual handling, without use of gloves.Na is a highly reactive metal and usually only sodium compounds will be observed in XPS.
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