ICP-AES Determination of 9 Essential Elements in Plants with Microwave Assisted Sample Digestion

Plant sample was digested with HNO3 and H2O2 in a PTFE vessel and heated in the MARS 5 Microwave Digester under a prescribed working program.The sample solution in a definite volume of dil.HNO3 acid was used directly for the ICP-AES determination of 9 essential elements (K,Ca,Mg,P,B,Zn,Cu,Fe,Mn) under the optimized conditions.Only 3-4 hrs.were required for the whole process of analysis,including sample digestion.Method of standard curve was used in the determination.Good linearity was obtained for the standard curves.The proposed method was used to analyze a CRM of tea (GBW 07605),giving results in consistency with the certified values and values of RSD′s (n=5) in the range of 0.3%-4.7%.