Determination of Ten Major and Minor Elements in Vanadium-Titanium-Iron Concentrates by Microwave Digestion-Inductively Coupled Plasma Atomic Emission Spectrometry

0.100 0 g of sample was placed in a PTFE digestion tank, and 3 mL of hydrochloric acid, 1 mL of nitric acid, 1 mL of hydrofluoric acid were added for microwave digestion. After digestion, the solution was cooled, and 10 mL of 50 g·L^-1 boric acid solution was added for further digestion for 3 min. Then the solution was diluted to 100 mL with water. Inductively coupled plasma atomic emission spectrometry was used to determine titanium, silicon, aluminum, calcium, magnesium, vanadium, manganese, phosphorus, nickel, and chromium. Matrix effect was elimited by using matrix matching. Linear relationships were found between the intensity of the analytical lines and the mass concentration of each element within definite ranges, with detection limits (3s) in the range of 1.2-44 μg·L^-1. The proposed method was applied to analysis of standard samples, giving results in consistency with the certified values and RSDs (n=8) less than 5.0%. The determination results of actual samples by the wet proposed method were in consistency with those obtained by wet chemical method and atomic absorption spectrometry.