Sodium

Sodium is a silvery white alkali metal. In the Periodic Table, its symbol is Na and its atomic number is 11. Sodium, the fourth most common element on earth, is frequently found in the form of sodium chloride, or table salt.

Uses
Sodium is frequently used in the form of sodium chloride, or table salt. Metallic sodium is used to manufacture esters and in the preparation of organic compounds.

In Sewage Sludge
In the Targeted National Sewage Sludge Survey, a 2009 test of 84 samples of sewage sludge from around the U.S., the EPA found sodium in every sample in concentrations ranging from 154 to 26,600 parts per million.

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