Direct ICP-OES determination of low concentrations of Cu, Fe, Li, Ti, and V in potassium lithium tantalate niobate crystals

A fast method of direct trace element determinations in a potassium-tantalum-niobium matrix has been developed. A new dissolution method was proposed. The PerkinElmer Optima 3300 RL ICP-OES with multicomponent spectral fitting (MSF) of spectral line corrections was used. Because of the complex matrix, less common spectral lines were chosen. The relative standard deviations (RSDs) for trace element (Cu, Fe, Li, Ti, and V) determinations were 0.2 -0.6%, the limits of detection (LOD) in solutions were 0.005 - 0.015 mg/L, which is equivalent to 5 - 15 ppm in solid samples.