| Abstract: | Abstract Differential Pulse Voltammetric (DPV) methods for the determination of iron (Fe), titanium (Ti), vanadium (V) and chromium (Cr) in a synthetic milling solution of titanium alloy are presented. N-2-hydroxyethyl-ethylene diamine triacetic acid (EDTriA) or ethylene diamine tetraacetic acid (EDTA) was used to replace fluoride in complexing with all the metal ions. EDTriA was found to be a better ligand than EDTA in the determination of Fe, Ti and V. However, the reverse was true for Cr. Ti and Cr, which would interfere in the determination of V, was precipitated from the synthetic solution by adding EDTriA at very high pH. In the Cr determination, Ti and V were the major interfering species. The difficulty caused by Ti was alleviated by precipitating the Ti with EDTA at very high pH. The other difficulty, which was caused by V, was solved by using peak subtraction because of the perfect overlapping of the V and Cr peaks. |
