Flow-injection determination of phosphate species in detergents with a calciumion-selective electrode |
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| Authors: | Peter W Alexander Javapa Koopetngarm |
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| Institution: | Department of Analytical Chemistry, University of New South Wales, P.O. Box 1, Kensington, N.S.W. 2033 Australia |
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| Abstract: | A calcium ion-selective electrode is applied for the determination of ligands which complex calcium ions. The response of the electrode is measured when ligand solutions are injected into a buffered carrier stream containing calcium. Injections of EDTA, citrate, tripolyphosphate and pyrophosphate provide peaks with heights dependent on both the ligand and calcium concentrations. Ligand concentrations down to. 2 × 10?5 M can be detected. Tripolyphosphate in detergents is easily determined. Use of the electrode has advantages over spectrophotometric methods for phosphates in flow systems. |
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