Spectrophotometric determination of sulphate in sodium hydroxide solutions by flow-injection analysis |
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Authors: | EA Jones |
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Institution: | Council for Mineral Technology (Mintek), Private Bag X3015, Randburg 2125 South Africa |
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Abstract: | A spectrophotometric flow-injection procedure is described for the determination of sulphate in sodium hydroxide solutions. Sulphate catalyses the reaction between zirconium and methylthymol blue to form a complex measured at 586 nm. Optimal reaction conditions are discussed. The calibration graph is linear over the range 0.05–0.5 g l?1 sulphate with a relative standard deviation of 0.02. The sample throughput is 20 h?1. Sulphate is easily determined in 1 M sodium hydroxide; the results agree with those obtained by the conventional gravimetric method and by ion chromatography. |
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