Determination of 17 Micro Elements in Aluminum and Aluminum Alloy by ICP-AES

The 10 drops of 200 g·L^-1 sodium hydroxide solution was dropped into 0.050 0 g of sample, and the mixture was heated at 150℃ for 15 s. After the violent reaction stoped, another 6 mL of 200 g·L^-1 sodium hydroxide solution was added, and the mixture obtained was heated for 40 min at 200℃. After removing the breaker, 2 mL of 30% (mass fraction) hydrogen peroxide solution was added for further reaction at 200℃ for 20 min until the excess hydrogen peroxide was completely decomposed. After cooling, 20 mL of 50% (volume fraction) nitric acid solution and 2 mL of hydrochloric acid were added into the solution, the mixture was heated at 200℃ untill the solution became clear. After cooling, the solution obtained was diluted to 100 mL with water. Elements of Fe, Cu, Mg, Zn, Ni, Cr, Zr, Sn, Ti, Sr, Ga, Be, Pb, Cd, Si, Mn, V in the sample were determined by ICP-AES with radio frequency power of 1 300 W, observation height of 12 mm and atomizing gas flow rate of 0.65 L·min^-1. The spectral interference from matrix interference was eliminated by optimizing spectral lines, and the physical interference from matrix interference was eliminated by matrix matching method and synchronous background correction method. The proposed method was applied to the analysis of 10 standard samples, the mass concentrations of 17 elements in the standard sample were linearly related to their corresponding spectral line intensities in definite ranges, with detection limits (3s) in the range of 0.000 3%-0.027 2%. RSDs (n=11) of the determined values of the actual samples were found in the range of 0.23%-3.1%. Relative errors of the standard sample ranged from -0.22% to 5.0%, with RSDs (n=11) of the determined values in the range of 0.17%-4.5%.