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Abstract

A simple and rapid procedure for the extraction and analysis of chromium by spectrophotometric method has been developed. Throughout the world the content of hexavalent chromium in cement is under control. In Europe, the new restrictions on the amount of this substance prohibit the use of cement having concentration more than 2 ppm. However, hexavalent chromium contents in cements above 2 mg kg¹ are still found frequently. The study represents a contribution to the establishing of possible limitations of this compound. The analyses showed that 7 of 10 cement samples analyzed by us satisfy the requirements for limit value of 2 ppm for water-soluble chromium (VI) in cement available in our market. Chromium (VI) was analyzed using the reference diphenylcarbazide spectrophotometric method from TRGS 613. The results for the absorbance spectra showed that maximum absorbance peak of the hexavalent chromium complex was at 538.7 nm. It was recorded in the range 25-200µg Cr(VI) L¹ using Varian Cary 50 reader system. This study presents a new procedure for chromium extraction. Parameters such as 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 a 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, cost-effective analysis to measure low levels of hexavalent chromium.

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