Removal of lead contaminant from Cr surfaces by using H2O2/EDTA cleaner solution.

All industrial processes especially metal cleaning procedures dealing with dangerous solutions should be used as little as possible and their emission into the aquatic environment should be controlled. In this study, in order to find a proper and efficient cleaning process, lead pollution was removed from the solid matrix by using a cleaner solution containing EDTA and H2O2 as chelating and oxidizing agents respectively. An orthogonal array design (OAD), OA9, was employed as a chemometric method for the optimization of the procedure. The results of experiment revealed that, lead pollution (-3 g) at the predicted optimum condition can be effectively removed from the solid matrix during 4 minutes. Cleaning quality was checked by SEM/EDAX, ICP and UV spectroscopy methods. Finally, the results of this investigation showed that H2O2/EDTA system can be considered as a novel, safe and an efficient cleaning solution, due to its proper processing parameters.