Abstract：The sample was digested with mixed acid system (nitric acid-hydrofluoric acid-perchloric acid) based on the optimized program of full automatic digestion instrument.The mass spectral interference was corrected by selecting proper isotopes and correction equation of interference elements. Then, a new determination method of 15 elements including beryllium, vanadium, manganese, cobalt, nickel, copper, zinc, molybdenum, cadmium, barium, thallium, lead, silver, chromium and antimony in Zhundong coal was established by inductively coupled plasma mass spectrometry (ICP-MS) combined with electric heating digestion. The obtained optimum experimental conditions were listed as follows: lead and nickel were determined at standard mode;beryllium, manganese, cobalt, copper, zinc, molybdenum, cadmium, barium, thallium, chromium and antimony were determined at collision mode with helium gas flow rate of 3.0 mL/min; vanadium and silver were determined at collision mode with helium gas flow rate of 4.0 mL/min. The influence of matrix effect and signal drift was eliminated when 205Tl and 208Pb were corrected with 187Re, while 9Be, 51V, 55Mn, 59Co, 60Ni, 63Cu, 66Zn, 98Mo, 111Cd, 138Ba, 107Ag, 52Cr and 121Sb were corrected with 115In. The linear correlation coefficients of calibration curves of 15 elements were all higher than 0.999 9. The detection limits were between 0.005 μg/g and 0.400 μg/g. The proposed method was applied to the determination of 15 elements in Zhundong Wucaiwan coal sample. The relative standard deviations (RSD, n=11) were between 0.4% and 3.3%, and the recoveries were between 94% and 115%. Except for chromium, thallium and silver whose content was too low to exceed the detection limit of inductively coupled plasma atomic emission spectrometry (ICP-AES), the determination results of other elements were consistent with those obtained by ICP-AES.
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ZHANG Geng-yu,SHI Yun-fen,DONG Xiang-jun,WEI Qun,QU Di-fei. Determination of fifteen elements in Zhundong coal by inductively coupled plasma mass spectrometry combined with electric heating digestion. , 2017, 37(6): 26-32.
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