Hexavalent Chromium Determination in Waste from Leather Industry Using Spectrophotometric Methods

Focus of this paper is the description of common used methods for hexavalent chromium measurement. This work is focused especially on commonly available spectrophotometric method based on the reaction with 1,5-diphenylcarbazide, because not every laboratory is equipped with modern devices for this pollutant measurement,. Special attention was focused on the variability possibilities of the basic spectrophotometric method with practical demonstration of individual variants, some critical points and moments in laboratory conditions using real samples containing hexavalent chromium. Among others, there are mentioned other spectrophotometric methods with which we do not meet often. Confirmation of presence of hexavalent chromium in samples was performed also by Raman spectroscopy and use of this method was discussed too. Key-Words: Leather waste, hexavalent chromium, measurement variability, spectrophotometric method, 1,5diphenylcarbazide, Raman spectroscopy.