Summary
Determination of Calcium in Chlor-alkali Brine by Flow Injection Analysis
A few milligrams of calcium in one liter of chlor-alkali brine were determined by flow injection analysis. When the calcium content was lower, the preconcentration and separation of calcium from sodium chloride with a chelating resin column was employed. The flow injection analysis was based on the exchange reaction between calcium and zinc complex of ethylene glycol-bis(2-aminoethylether)tetraacetic acid (EGTA) in the presence of 2-(3,5-dibromo-2-pyridylazo)-5-[N-ethyl-N-(3-sulfopropyl)amino]phenol(H2R):
. Calcium (0.25–2.0 mg 1−1 in the presence of magnesium, iron(III), aluminum, copper(II), nickel, phosphate, chloride, sulfate and carbonate can be determined with a sampling rate of 40 h−1.
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References
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