Determination of Seven Elements in Cereal Products by ICP-MS
To establish an accurate and rapid determination method of trace heavy metal elements in cereal products,seven trace heavy metal elements(As,Cd,Pb,Mn,Cu,Zn,Fe)in cereal products,such as quinoa and mung bean sporouts,were determined by inductively coupled plasma mass spectrometry(ICP-MS).The samples were digested with nitric acid and hydrogen peroxide and the instrument analysis conditions were optimized.As,Mn,Cu,Zn,and Fe were determined by KED mode,while Pb and Cd were determined by STD mode.These seven elements were determined by the standard curve method.As shown by the results,the linear regression equations for As,Cd,Pb,Mn,Cu,Zn,and Fe were y=1.49 × 102x+0,y=3.06× 102x+0,y=1.026 7×104x+0,y=1.029 × 103x+0,y=1.088× 103 x+0,y=2.67× 102x+0,y=3.4×101 x+0,respectively;the linear range of As,Cd,Pb,Mn,and Cu was 0.10 to 800.0 μg·L-1,that of Zn was 5.00 to 300.0 μg·L-1,and that of Fe was 5.00 to 800.0μg·L-1;the correlation coefficients were between 0.999 4 and 0.999 6;the detection limits(3s/k)varied from 6.8 ×10-6 to 2.6 × 10-2 mg·kg-1;RSDs(n=6)ranged from 0.26％to 13.1％and the recoveries of samples were 89.2％～107％.This method is suitable for the accurate and rapid determination of As,Cd,Pb,Mn,Cu,Zn,and Fe in cereal products such as quinoa and mung bean spronts.
ICP-MSdeterminationcereal productstrace heavy metal elements
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