Kinetic dual standard additions method for the determination of two mutually interfering analytes: Molybdate and tungstate |
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Authors: | Ronghuan He Jianhua Wang |
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Institution: | (1) Chemistry Department, Yantai Teachers College, 264000 Yantai, Peoples Republic of China |
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Abstract: | A kinetic dual standard additions method for determination of two mutually interfering analytes is proposed. The deviations of absorbance from additivity in kinetic systems, caused by synergistic effects of catalysts, are compensated with the defined synergistic catalytic coefficient. The hydrogen peroxide-iodide kinetic reaction catalysed by molybdate and tungstate was studied with the stopped-flow injection technique and the conditions for simultaneous determination of Mo and W established. The molybdenum and tungsten contents in different samples were determined with recoveries of 97.6 102.1% and 96.9 98.6%, and relative standard deviations of 2.3 3.4% and 1.6 2.6%, respectively. |
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Keywords: | kinetic-dual standard additions synergistic coefficient simultaneous determination molybdate tungstate peroxide iodide |
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