ICP-AES Determination of 10 Metal Elements in Nickel Concentrate with Microwave Assisted Sample Digestion

Ten elements, i.e., Al, Ca, Co, Cr, Cu, Mn, Mg, Ni, Pb and Zn, in nickel concentrate were determined simultaneously by ICP-AES with microwave assisted sample digestion. 0.200 0 g of the sample in a digestion vessel was mixed with 2 mL of HCl, 6 mL of HNO3 and 1 mL of HF successively; after covering the vessel tightly, the sample was digested in microwave digestor under the pre-set programe. Analytical spectral lines of 308.215 nm (for Al), 317.933 nm (for Ca), 228.616 nm (for Co), 267.716 nm (for Cr), 324.745 nm (for Cu), 279.079 nm (for Mg), 257.610 nm (for Mn), 220.353 nm (for Pb), 206.200 nm (for Zn) and 231.604 nm (for Ni) were chosen for the analysis. Matrix effect was compensated by the matching method in preparation of calibration curves. The proposed method was applied to the analysis of a CRM (GBW 07283) and a sample of nickel concentrate. The results of the elements found in the CRM by the present method were in consistency with the certified values, while the results of elements found in the concentrate sample were checked quite well with the results obtained by the GB methods. Values of recovery found were in the range of 95.8%-103.1% with RSD′s (n=6) less than 4.5%.