Lanthanide luminescence quenching as a detection method in ion chromatography. Chromate in surface and drinking water |
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Authors: | M Schreurs G W Somsen C Gooijer N H Velthorst R W Frei |
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Institution: | Department of General and Analytical Chemistry, Free University, Amsterdam, The Netherlands. |
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Abstract: | Dynamic quenching of Eu(III) and Tb(III) luminescence by inorganic anions as a detection method in ion chromatography was investigated. To obtain a high luminescence intensity, lanthanide(III) complexes are formed with ligands which make indirect excitation of the ions possible. Only a few anions (e.g., nitrite, chromate) induce efficient dynamic luminescence quenching. Chromate is an efficient quencher of Tb-acac luminescence. Samples of tap water and surface water, spiked with chromate, were injected into a high-performance liquid chromatographic system with post-column addition of the luminescent complex. In this way, a detection limit of 1.1 . 10(-7) M (13 ppb) of chromate could be obtained. |
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