Determination of Molybdenum in Steels, Soil, and Sea Water by Spectroscopic Methods and Adsorption Voltammetry

Procedures were developed for the determination of molybdenum in steels, soil, and sea water using o,o"-dihydroxyazo compounds Lumogallion IREA (LG) and Magneson IREA (MG)] and heterocyclic azo compounds 4-(2-pyridylazo)resorcinol (PAR) and 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol (5-Br-PAAP)], including their determination in the presence of the third component, hydoxylamine (HA). The addition of the third component improved the selectivity of determination. The advantage of the developed procedures is that they do not involved extraction and, thus,shorten the analysis. Molybdenum can be determined in sea water in the presence of LG or LG + HA by diffuse reflectance spectroscopy or adsorption voltammetry using the added–found method or using visual tests. In the presence of MG, PAR, and 5-Br-PAAP, the standard addition method was used to eliminate the matrix effect.