Determination of Trace Elements and the Dissolution Rate in Anti-rheumatism Chinese Herbal Medicines by FAAS

Four trace elements Cu,Fe,Zn and Mn in seven anti-rheumatism Chinese herbal medicines(Radix Cynanchi Paniculati,Nodus Terebinthinae,Aristolochia Mollissima,Fructus Chaenomelis,Luffa Cylindrica,Cibotium Barometz,Angelica Pubescens) have been determined by FAAS respectively.The samples were digested with HClO4 and HNO3 in a volume ratio of 4:1.Four kinds of trace elements Cu,Zn Mn,Fe and their dissolution rate are calculated.The average recoveries of the samples are between 99.0% and 103.0%,the relative standard deviation(RSD)≤0.2%.The determination results indicate that these Chinese herbal medicines are rich in microelements,among which the Cu content is relatively low.But the dissolution rate of Cu is relatively large.It offers theoretical data for the study of anti-rheumatism Chinese herbal medicines.