Simultaneous determination of tungsten and molybdenum in sea water by catalytic current polarography after preconcentration on a resin column |
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| Authors: | Yoshiki Sohrin Kenji Isshiki Eiichiro Nakayama Sorin Kihara Masakazu Matsui |
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| Institution: | Research Center for Instrumental Analysis, Faculty of Science, Kyoto University, Kyoto 606 Japan;Institute for Chemical Research, Kyoto University, Uji, Kyoto 611 Japan |
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| Abstract: | The simultaneous determination of tungsten and molybdenum in sea water is based on preconcentration by column extraction with 7-(1-vinyl-3,3,5,5-tetramethylhexyl)-8-quinolinol (Kelex- 100) resin, and measurement of the polarographic catalytic currents obtained in a solution of chlorate, benzilic acid and 2-methyl-8-quinolinol. When the concentration factor is 50, the detection limits are 2.4 pM for tungsten and 17 pM for molybdenum (for a signal-to-noise ratio of 3). The precision of the determination is ca. 10% for 67 pM tungsten and ca. 5% for 106 nM molybdenum in sea water (n=4). Results for sea water and other natural waters are presented. |
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