[Determination of trace elements in hollyhock by microwave digestion-FAAS].

Hollyhock powder was digested by microwave digestion before determination. The eight trace elements, Fe, Cu, Zn, Mn, K, Ni, Ca and Mg, in hollyhock were determined by microwave FAAS. Standard curves method was used for the determination. The samples were digested with HNO3. The conditions of digestion were optimized. The effect of different microwave digestion conditions on the analysis results was reviewed, and the optimal condition for using atomic absorption spectrophotometry was determined. The experiments indicated that the content of trace elements of human needs, Mg, Ca, Fe, K etc. are highly enriched, the content of Mn and Zn is middling, and the content of Cu and Ni is low. The method is highly sensitive, convenient and speedy. The recovery (n = 6) is 92.25%-110.50%, and the RSDs (n = 6) are lower than 5%. The results are satisfactory.