When choosing a method of analysis, you first need to know the tasks and goals, the advantages and disadvantages of the method of analysis. The ain factors when choosing a method and methodology are the limit of definition, sensitivity and reproducibility. In order to determine these characteristics and select the most appropriate analysis methodology, a number of studies were conducted. To determine molybdenum (VI), the rhodanide, peroxide methods, and the method of determination in the UV region were used. For each technique, a series ofanalyzes was performed and calibration graphs were constructed, and the coefficients of confidence of the approximation were found. The determination of molybdenum in the UV region was checked and the spectra of molybdenum were obtained at various concentrations. Comparison of methods for determining molybdenum (VI) was carried out by finding the minimum concentration and sensitivity coefficients. Based on a comparison of the sensitivity of different methods and the assessment of the metal content in the sample under investigation, the most optimal method was chosen.