Abstract
Abstract A spectrofluorimetric method for the determination of trace amounts of molybdenum was developed, based on ion-exchange spectrofluorimetry (IEF). Molybdenum reacts with carminic acid to give a red fluorescent complex, which was fixed on a dextran-type anion-exchange gel. The fluorescence of the gel, packed on a 1-mm quartz cell, was measured directly using a solid-surface attachment. The applicable concentration range was from 1.0 to 15.0 μg-l-1, with a relative standard deviation of 1.4 % and a detection limit of 0.3 μg-l-1. The method was applied to the determination of molybdenum in natural waters. This method is more sensitive and selective than that using carminic acid alone.
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