Background:Measuring trace elements in tea can determine its nutritional value

verify the authenticity and place of origin

and detect the poisonous and harmful elements remaining in tea due to the application of chemical fertilizers and pesticides.Purpose:In order to reduce the time for sample preparation and the costs of equipment maintenance

wavelength dispersive X-ray fluorescence(WDXRF) spectroscopy was used to determine the trace elements in tea which is rapid

non-destructive and accurate.The contents of more than 20 elements can be measured simultaneously.Methods:Sample pieces were made by the sample preparation method of boric acid rebasing.To avoid the exogenous environmental pollution subjected in the growth of tea

we removed the residual dust of the tea by cleaning it.According to the principle that the standard samples should be similar types with the samples to be analyzed to select standard samples.The curves were built by SuperQ

which contained compiling the measurement conditions

establishing the measurement conditions

checking the angles

determining the measurement times

checking PHD and adding the contents and the names of sample pieces.The accuracy of the method can be obtained by comparing the measured values with the trace element contents of standard samples.The contents of trace elements in tea determined by WDXRF can be used to classify the tea attribution and the tea species through cluster analysis of SPSS software.Results:(1) The results show that the biggest relative standard deviation is 0.43% of Pb

and the precision is very good.(2) Five kinds of tea are taken separately in Fujian and Yunnan

measured three times with the established working curves.And tree diagram of cluster analysis can be obtained with SPSS software to analyze the measured average values with cluster analysis

coupling method between groups and Minkowski distance measurement techniques.It can be seen that in the tree diagram

when the critical value λ was 15

the tea samples were divided into two categories.Y1 to Y5 were Yunnan tea samples and F1 to F4 were Fujian tea samples.Four kinds of black tea

any three kinds of green tea and a kind of jasmine tea are taken in Yunnan

measured three times with the established working curves.And tree diagram of cluster analysis can also be obtained.Cluster analysis showed that

black tea and green tea can be classified significantly based on the contents of mineral elements in tea.Conclusions:Compared with AAS and ICP-OES

WDXRF is a small-costing

short-consuming and simple-process method.