Research of Heavy Metals Determination in Cereals by Inductively Coupled Plasma Mass Spectrometry
LU Mei-bin, WANG Bu-jun*, LI Jing-mei, LI Wei-xi, YANG Xiu-lan, SONG Jing-ke
Institute of Crop Science, Chinese Academy of Agricultural Sciences and Supervision and Testing Center of Cereal Quality, Ministry of Agriculture, Beijing 100081, China
Abstract：The present paper established the determination method of heavy metals such as As, Pb, Hg and Cd in cereals by inductively coupled plasma mass spectrometry (ICP-MS) with microwave digestion. The pretreatment conditions were improved and the instrument operating parameters were optimized. 72Ge, 115In and 209Bi were selected as the internal standard elements to overcome the matrix effects and instrument fluctuations effectively. Interference correction equations were used to eliminate the interference of polyatomic ions. Satisfactory linearity of standard curves was obtained with elemental correlation coefficients over 0.999 9. The detection limits were in the range of 0.000 6～0.016 mg·L-1, the recoveries of samples were 90%～110%, and the RSD was within 5%. The accuracy of the method was evaluated with national standard reference materials and the interference test was experimented using standard solution. Studies have shown that the method is suitable for rapid determination of heavy metals As, Pb, Hg and Cd in cereals with wide linear range, good precision and high accuracy.
Key words：ICP-MS;Microwave digestion;Cereals;Heavy metal
陆美斌，王步军*，李静梅，李为喜，杨秀兰，宋敬可. 电感耦合等离子体质谱法测定谷物中重金属含量的方法研究[J]. 光谱学与光谱分析, 2012, 32(08): 2234-2237.
LU Mei-bin, WANG Bu-jun*, LI Jing-mei, LI Wei-xi, YANG Xiu-lan, SONG Jing-ke . Research of Heavy Metals Determination in Cereals by Inductively Coupled Plasma Mass Spectrometry. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2012, 32(08): 2234-2237.
