Metabolic profiles caused by rare earth complex were investigated using NMR and ICP-MS techniques.Male
and female Wistar rats were treated orally with Changle(A kind of rare earth complex applied in agriculture to raise the
production of crops)at dose of 2,5 and 20 mg·kg-1body weight day respectively for 90 d.Urine and serum samples are
collected on 90 d.The relative concentrations of importantendogenousmetabolites in urine and serum are determined from
1HNMR spectra and the contents of the four rare earth elements(La,Ce,Pr and Nd)constituting Changle in the serum
samples are measured by ICP-MS technique.Changle-induced renal and liver damage in rats is found based on the in-
crease in the amounts of the amino acids,trimethylamine N-oxide,N,N-dimethyglycine,dimethylamine,succinate,α-
ketoglutarate and ethanol as well as rare earth concentrations.The similarities and differentiations are found in the alter-
ation patterns of metabolites and rare earth concentrations in serum.