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Sulfate Determination in Natural Waters by Nonresonance Line Furnace Atomic Absorption

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The determination of sulfate in potable water is normally accomplished by its precipitation with an excess of barium ion followed by measuring the turbidity of the suspended precipitate, gravimetry, or, as more recently advocated, flame atomic absorption (AA) measurement of nonprecipitated barium. We undertook to adapt the constant temperature Woodriff atomic absorption furnace for this very common analysis. Direct sulfur determination is not routinely performed by flame or nonflame atomic absorption because of difficulties associated with the use of the far-uv resonance lines of that element. Therefore, efforts were directed at precipitation of the sulfate with a metal ion followed by determination of the metal retained on a porous graphite filter after washing off of excess precipitant. It was discovered that nonresonance atomic absorption of the lead in a lead sulfate precipitate served the purpose.

Keywords: Nonflame atomic absorption; Nonresonance line atomic absorption; Sulfate

Document Type: Short Communication


Affiliations: 1: Department of Chemistry, Montana State University, Bozeman, Montana 59715; present address: Department of Chemistry, Marquette University, 535 N. 14th St., Milwaukee, WI 53233 2: Department of Chemistry, Montana State University, Bozeman, Montana 59715

Publication date: March 1, 1977

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