Abstract：The aluminum vanadium tin chromium alloy was a kind of intermediate alloy for smelting titanium alloy. In order to accurately and rapidly determine the content of vanadium and chromium in such alloy, the continuous determination conditions of high content vanadium and high content chromium by ammonium ferrous sulfate titrametry were investigated. Consequently, a determination method was established. The sample was decomposed with sulfuric acid-phosphoric acid-nitric acid mixture. The vanadium in solution was oxidized at room temperature with potassium permanganate. Then, the excessive potassium permanganate was reduced with sodium nitrite. Meanwhile, the excessive sodium nitrite was decomposed with urea. The vanadium in solution was titrated with ammonium ferrous sulfate standard titration solution. Its content was calculated based on the volume of consumed ammonium ferrous sulfate standard titration solution. The vanadium and chromium in the solution after titration were simultaneously oxidized to high valence with ammonium persulfate by heating in presence of catalyst silver nitrate. Then, the total content of vanadium and chromium was titrated with ammonium ferrous sulfate standard titration solution. The volume difference of consumed ammonium ferrous sulfate standard titration solution between two titrations was that for the titration of chromium. Therefore, the content of chromium could be obtained. The proposed method had been applied to the determination of vanadium and chromium in aluminum vanadium tin chromium alloy sample. The relative standard deviation (RSD, n=10) was 0.22% and 0.75%, respectively. The recoveries were 101%-105% and 96%-101%, respectively.
曹瑞,张丹丹,邱月梅,等. 电感耦合等离子体原子发射光谱法测定钨钢中硅、锰、磷、铬、镍、铜、钼、钒和钨[J]. 理化检验:化学分册(Physical Testing and Chemical Analysis Part B: Chemical Analysis),2014,50(9):1153-1155.
