ICP-AES Determination of Lanthanides in Orange

An ICP-AES method for the simultaneous determination of La,Ce,Pr,Nd and Sm in orange was proposed.It was found that precision of results obtained by microwave assisted sample digestion was better than those obtained by the dry ashing method.Analytical conditions,including choice of analytical sepctral lines,elimination of interferences,setting of integration time and parameters of microwave digestor,were studied experimentally.Wavelengths of 333.749,418.660,390.844,415.608 and 359.260 nm were selected as analytical lines for the determination of La,Ce,Pr,Nd and Sm respectively.Detection limits (3s/k) of La,Ce,Pr,Nd and Sm found were 0.003 3,0.017 0,0.014 0,0.039 0 and 0.007 8 mg·L-1 respectively.The proposed method was used in the determination of lanthanides in pomelo,giving values of recovery in the range of 96.8%-101.0% and values of RSD′s (n=5) less than 5.5%.Analytical results of the proposed method were compared with those of the GB method,as verified by t-test at the confidence level of a=0.05,no significant difference was found between the two methods in the analysis of pomelo.