Determination and analysis of 25 kinds of elements in various vegetables by microwave digestion-inductively coupled plasma mass spectrometry
Objective To establish a method for simultaneous determination of 25 elements in various vegetables by In-ductively coupled plasma mass spectrometry(ICP-MS)method,which can provide a new method for the determination of the contents of elements in various vegetables.Methods The vegetable samples(spinach,Chinese cabbage,celery,cu-cumber,tomato,radish,potato,long bean)were digested in nitric acid by microwave digestion,the digestion solution was transferred to a 25 mL volumetric flask with pure water after digestion.Then microwave digestion was adopted,and rea-sonable internal standards was selected to eliminate the interference.ICP-MS method was used to test the contents of 25 elements in vegetables.The 25 elements include K,Na,Mg,Ca,Al,Fe,Mn,Zn,Li,B,V,Cr,Co,Ni,Cu,As,Se,Rb,Sr,Mo,Cd,Sn,Sb,Ba,Pb.Results The experimental results showed that the detection limit of 25 elements was within 0.002-0.2 mg/kg,and the linear correlation coefficient of all elements was greater than 0.999.The recovery rates of the method were within 84.1％-108％,and the relative standard deviations were within 1.3％-6.9％.The analyzed results of 25 elements in GBW10024 were consistent with the certified values,the accuracy rates of the method were within 86.2％-114％,which can meet the demand of simultaneous determination of 25 elements in various vegetables.Conclusion The method is rapid,accurate and reliable,with low detection limit and high accuracy,and the sample pre-treatment is simple and easy,which is suitable for the analysis and detection of 25 elements in a variety of vegetable samples.
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