Determination of 17 Trace Elements in Pure Aluminum by Inductively Coupled Plasma Mass Spectrometry

The pure aluminum sample （0.1 g） was taken and placed in a polytetrafluoroethylene beaker, and 3 mL of hydrochloric acid was added, then the mixture was heated at 80 °C for dissolution. After cooling, the solution was made its volume up to 50 mL with water. 5 mL of aforementioned solution was taken and made its volume up to 50 mL with 2% （volume fraction） nitric acid solution. 17 trace elements （copper, manganese, titanium, gallium, chromium, nickel, bismuth, lead, tin, vanadium, barium, beryllium, cadmium, cobalt, molybdenum, antimony, and strontium） in the solution was determined by inductively coupled plasma mass spectrometry under the condition of kinetic energy discrimination collision mode, radio frequency power of 1400 W, atomization gas flow rate of 1.00 mL·min⁻¹, and collision gas （helium） flow rate of 3.5 mL·min⁻¹. Rhodium was selected as the internal standard for online correction, and the matrix matching method was used for quantification. As shown by the results, linear relationships between the corresponding signal intensities after internal standard correction and mass fractions of 17 trace elements were found within 100 μg·g⁻¹, with detection limits （3s） in the range of 0.001‒0.75 μg·g⁻¹. RSDs （n=8） of the determined values of the actual pure aluminum sample were in the range of 0.50%‒3.6%. Test for recovery was made according to the standard addition method, giving results in the range of 91.4%‒112%. The method was applied to the analysis of an actual pure aluminum sample, and the determined values of elements were basically consistent with those obtained by GB/T 20975.25—2020.