complex was at 538.7 nm. It was recorded in the range 25-200µg Cr(VI) L
-1) using Varian Cary 50
reader system. Parameters such extraction time in dependence of the rotary of the stirring and
wavelength variation were optimized and the results obtained were satisfying. In the present work а cement sample from the Devnya manufacturer was tested and it was found that this cement satisfies the European standard requirements. Finally, this application describes a simple and rapid, costeffective analysis to measure low levels of hexavalent chromium.