Lanthanide luminescence quenching as a detection method in ion chromatography. Chromate in surface and drinking water.
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.
Schreurs
M
M
Department of General and Analytical Chemistry, Free University, Amsterdam, The Netherlands.
Somsen
G W
GW
Gooijer
C
C
Velthorst
N H
NH
Frei
R W
RW
D002840:Chromates / Q000032:analysis*; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D005063:Europium; D006863:Hydrogen-Ion Concentration; D008163:Luminescent Measurements; D008674:Metals, Rare Earth; D013696:Temperature; D013725:Terbium; D014873:Water Pollutants / Q000032:analysis*; D014874:Water Pollutants, Chemical / Q000032:analysis*; D014881:Water Supply / Q000032:analysis*
D002840:Chromates; D008674:Metals, Rare Earth; D014873:Water Pollutants; D014874:Water Pollutants, Chemical; D013725:Terbium; D005063:Europium