Abstract: This paper studied the method of assaying trace elements by ICP-AES.According to the characteristics of instrument, such as analysis of spectral line, RFpower, nebulizer pressure and sample uptake rate. The optimum analysis parameters should be determined. The interference was avoided at the up most degree and the up spectrum background was eliminated rationally. In order to detect the accuracy of the method, GBW07601 was evaluated. And the precision of the method was scaled by the retrieval proportion of added sample and the RSD.The results showed when RF power was 1150W,nebulizer pressure 25PSI, and sample uptake rate 1.85ml/min. The retrieval proportion of added sample of the 7elements was from 84.6%～103.8% and the relative standard deviation (RSD%) less 6.The result was satisfactory to assay the apple juice concentrate。

Key words: ICP-AES, apple juice concentrated, trace elements