Determination Method Study of Cu in Niobium by ICP-AES

A new method was worked out for the determination of Cu in niobium mental by inductively coupled plasma-atomic emission spetrometry (ICP-AES). The influence of acid on Cu, the selection of analytical lines and the spectral interference of matrix and concurrent elements were investigated. The results show that the mix acid of 5 mL nitric acid, 2 mL hydrofluoric acid and 2 mL hydrochloric acid and concurrent elements have no effect on the measure result of Cu. Matrix element has background and spectral interference on the measure of Cu. Spectral interference lines are avoided and analytical lines are selected. In the content range of 0.001% to 0.010%, Cu in metal niobium can be determined accurately and reliably. The recovery rate is in the range of 90%～106%. The relative standard deviation (RSD%) of results is less than 7.23%.