SPECTROPHOTOMETRIC DETERMINATION OF MICROQUANTITIES OF MOLYBDENUM IN GLASSES.

It has been established that the addition of cetyl-pyridinium chloride to a molybdenum-trioxyfluorone system leads to a sharp increase in the sensitivity of the reaction and to the displacement of the complex-formation into the more acid region. In this study we used alcohol solutions of 5. 10** minus **3 M o-nitro-phenylfluorone (ONPF). The reaction studied was used for the rapid non-extractive determination of small amounts of MoO//3 in glasses obtained in an electric furnace with Mo electrodes. (Experimental data show that the method can be recommended for the determination of microquantities of Mo in glasses, priming enamels, and silicate materials. The correctness of the method was checked by an 'added-found' method.