[Determination of eight elements in grain and vegetable by microwave digestion-ICP-MS].
OBJECTIVE
To set up a method for simultaneous determination of eight elements in grain and vegetable by microwave digestion-inductively coupled plasma-mass spectrometry (ICP-MS).


METHODS
Food samples were digested in a microwave digestion system with nitric acid solution, and contents of Al, As, Cd, Cu, Pb, Zn, Fe and Ca in the digestion solutions were determined simultaneously by ICP-MS.


RESULTS
The national standard reference materials such as mussel (GBW08571) and wheat powder (GBW08503B) were applied in the process of sample analysis, and the determination values of the standard reference materials were within the certified values. The accuracy of the method was 79.4%-111.5%, and the RSD was less 1.1%-6.6%. The recoveries of the spiked samples were 93.5%-110%. In order to reduce the matrix interference, the calibration of internal standard and the sample dilution were introduced for ICP-MS.


CONCLUSIONS
This method has simple operation, rapid analysis, high accuracy, and reliable, and can be applied in simultaneous determination of multiple elements in food samples.
Ying
Bo
B
Institute for Environmental Health and Related Product Safety, Chinese Center for Disease Control and Prevention, Beijing 100050, China.
Liu
Liping
L
Liu
Jianrong
J
Ji
Rongdi
R
D000535:Aluminum / Q000032:analysis; D001151:Arsenic / Q000032:analysis; D002118:Calcium / Q000032:analysis; D002523:Edible Grain / Q000737:chemistry*; D013058:Mass Spectrometry / Q000295:instrumentation / Q000379:methods*; D008872:Microwaves; D008903:Minerals / Q000032:analysis*; D014675:Vegetables / Q000737:chemistry*; D015032:Zinc / Q000032:analysis
D008903:Minerals; D000535:Aluminum; D015032:Zinc; D001151:Arsenic; D002118:Calcium