Abstract: In this paper,the contents of 21 elements in Comastoma pedunlulatum and C.falcatum were determined by inductively coupled plasma-optical emission spectrometry (ICP-OES) with microwave digestion.The linear relationship of various elements were good (r≥0.9990) and the detection limits of the established method were lower than 0.0036 mg/L.The recovery rates of the studied elements were in the range of 86%-108% with the relative standard deviations (RSDs) less than 4.48%.Therefore,the accuracy and precision of the method were confirmed.The results indicated that detected elements had different concentration orders in C.pedunlulatum and C.falcatum. Ca,Mg and Fe that were essential for human body had high concentrations in two species of Comastoma. The contents of major elements and trace elements (Ca,Mg,Fe,Zn,Se,Mn,Cr,Cu,V,Ni,Mo) in C.pedunlulatum exceeded those in C.falcatum except for Se.For heavy metals (Pb,Cu,As),the contents of Pb,As in C.falcatum were higher than those in C.pedunlulatum while the contents of Cu were opposite.The results provided a scientific basis for the further studies of two species of Comastoma.

Key words: Comastoma pedunlulatum, Comastoma falcatum;ICP-OES;mineral elements