Simultaneous Determination of 14 Elements in Antimony Ores by Inductively Coupled Plasma-Atomic Emission Spectrometry

0.100 0 g of antimony ore sample was added an acid mixture composed of 5 mL of HCl-HNO₃ (3+1) mixed acid, 5 mL of HF, 0.5 mL of HClO₄ and 1 mL of H₂SO₄ (1+1) solution, and heated with the acid mixture (under 200℃), and the solution obtained was evaporated to near dryness. After cooling, 10 mL of a mixed acid of HCl-HNO₃-H₂O (3+1+4) were added and heated to dissolve the salts completely. After cooling, the solution was diluted to 50 mL with an acid solution of HCl-HNO₃-H₂O (3+1+36), and used for ICP-AES determination of 14 elements simultaneously. Analytical spectral lines were selected. Spectral interferences of several trace elements with the chose spectral lines, were overcome by background correction or correction coefficients. Values of detection limits (3s×500, 500 is the dilution factor) found for the 14 elements were in the range of 0.81-123 μg·g^-1. A CRM (GBW 07174) was analyzed by the proposed method, with values of RSDs (n=11) ranged from 0.51% to 7.1%.