If barium ion is being determined by sulfate precipitation, several metal ions must be absent since they also form insoluble sulfates. The common interferences are Ag +, Ca 2+, Hg 22+, Pb 2+, and Sr 2+. These interferences, as well as any other cation or anion that interferes, can be removed by some suitable separation method.
Barium is a chemical element with the symbol Ba and atomic number 56. It is the fifth element in group 2 and is a soft, silvery alkaline earth metal. Because of its high chemical reactivity, barium is never found in nature as a free element.
Barium is a silvery-white metal that takes on a silver-yellow color when exposed to air. Barium occurs in nature in many different forms called compounds. These compounds are solids, existing as powders or crystals, and they do not burn well.
The isotope with the longest half-life (barium-133, 10.5 years) is used as a gamma-ray reference source. Compounds. In its compounds, barium has an oxidation state of +2. The Ba 2 + ion may be precipitated from solution by the addition of carbonate (CO 3 2−), sulfate (SO 4 2−), chromate (CrO 4 2−), or phosphate (PO 4 3−) anions.
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