Fluorometric Determination of Traces of Nitrite with Rhodamine 6G

摘要

A simple and highly selective fluorometric method for determining nitrite with rhodamine 6G is described. The method is based on the oxidation of rhodamine 6G in sulfuric acid medium. A linear calibration graph passing through the origin was obtainedin the range 0.02-0.4 mu g/ml nitrite. The detection limit is 0.001 mu g/ml. The method is free from interference by Fe(III) and Cu(II), which normally interfere with other methods. The method was applied successfully to the determination of nitrite in tap water, lake water, and milk samples.