Abstract： There is serious interference from polyatiomic ions in the determination of impurity elements in phosphoric acid by traditional inductively coupled plasma mass spectrometry (ICP-MS). In this paper, the interference was effectively eliminated or reduced by collision reaction interface technique (CRI). The experiments indicated that, after the phosphoric acid sample was diluted directly, the instrument signal shift and matrix effect could be compensated with 89Y-115In-209Bi as internal standard elements; Mg, Al, Sr, Cd and Pb could be determined by non CRI mode; the spectral interference of V, Cr, Mn, Co, Ni, Cu, Zn and As could be eliminated with He as reaction gas，and the optimal flow rate of He was optimized as 90 mL/min; the spectral interference of Fe and Se could be eliminated with H2 as reaction gas，and the optimal flow rate of H2 was optimized as 70 mL/min. Detection limits of this method were 0.5-10 ng/g, and the recoveries of standard addition were 80%-120%. The proposed method was applied to determine industrial-level and food-level phosphoric acids samples. The results were consistent with those obtained by other methods, and the relative standard deviations (RSD) were less than 6.6% (n=6), which could meet the requirement for batch sample analysis.
陈永欣，黎香荣，韦新红，韩清娟，崔 翔，何龙凉. 碰撞反应界面—电感耦合等离子体质谱法测定磷酸中15种痕量杂质元素[J]. 冶金分析, 2012, 32(12): 15-21.
CHEN Yong-xin, LI Xiang-rong, WEI Xin-hong, HAN Qing-juan, CUI Xiang, HE Long-liang. Determination of fifteen trace impurity elements in phosphoric acid by collision reaction interface-inductively coupled plasma mass spectrometry. , 2012, 32(12): 15-21.
［12］ Sonia D, Nicola V, Costanza M, et al. Dynamic reaction cell ICP-MS for determination of total As, Cr, Se and V in complex matrices: Still a challenge? A review ［J］. Anal. Chim. Acta.，2011，698（1-2）, 6-13.
［13］ Denis P, Matthias L, Jürgen W. Reduction of polyatomic interferences in biological material using dynamic reaction cell ICP-MS ［J］. Microchem. J..2010，95（2）, 315-319.
［14］ Ali K, Laurent N, Rachida C, et al. Optimization of ICP-MS collision/reaction cell conditions for the determination of elements likely to be interfered (V, Cr, Fe, Co, Ni, As and Se) in foodstuffs［J］. Talanta，2011, 85(5), 2605-2613.
［15］ Rodrigo F S S, Marcelo B B G, Edenir R P, et al. Performance evaluation of collision-reaction interface and internal standardization in quadrupole ICP-MS measurements ［J］. Talanta，2011, 86, 241-247.
［16］ Guo W, Hu S, Xiao Y, Zhang H, et al. Direct determination of trace cadmium in environmental samples by dynamic reaction cell inductively coupled plasma mass spectrometry ［J］. Chemosphere.，2010, 81(11), 1463-1468.
