Abstract:Totally 88 fresh tea leaves samples(including new leaves and old leaves) from 5 producing districts in Jiangxi province were analyzed for the contents of Cu,Pb,Cd,As,Hg and Cr according to relevant national standards.The results reveal that cluster groups are not quite the same for new leaves,old leaves and fresh leaves although 5 groups were obtained each,which indicates that there are no clear natural separatrix,but there are significant differences within cluster groups for each heavy metal(P<0.05).By discriminant analysis with leave-one-out cross-validation,87.5% of fresh leaves were correctly discriminated into new or old one for their significant differences,while just 77.3% were correctly discriminated into mountain group or not.By simple correspondence analysis for data of improved Nemerow integrated pollution index(NIPI) of the six metals,old leaves reach to slightly polluted level while just precautious for new leaves with safe for middle and south district in Jiangxi and precautious for others.In conclusion,there is a slight difference among heavy metals in fresh leaves from various producing districts in Jiangxi but without clear natural separatrix.It’s good and uniform or similar in natural producing condition in Jiangxi and there are no great differences between mountain group and road one.
