Abstract: The five elements of Cu, Zn, Mn, Fe, and Ca in Oxytropis myriophylla (Pall.) DC. were extracted and separated into water-soluble state and suspension state by microporous filtering film, extraction methods, and so on. Water-soluble state was divided into organic state and inorganic state based on macro porous adsorption resin. The contents of five elements were detected by flame atomic adsorption spectrophotometry (FAAS). The results showed that the total extraction ratio and residual rate of five elements in water solution was in the range of 41.7-87.0% and 9.1-26.4%, respectively. The percentage of soluble form was in the range of 16.6-80.0%. Under test condition, the percentage of recovery was in the range of 91.0-109.0%. It is indicated that the trace elements exist in various speciations in O. myriophylla.

Key words: Oxytropis myriophylla (Pall.) DC., trace elements, speciation analysis, FAAS