Content Determination of Microelements and Heavy Metal in Houttuynia cordata by Dry Ashing Atomic Absorption Spectrometry

[Objective] The purpose was to supply theoretical basis for exploiting the edible and medicinal value of Houttuynia cordata.[Method] The contents of Fe,Cu,Mn and Pb in H.cordata were determined by dry ashing-flame atomic absorption spectrometry.[Result] The standard curve regression equations and correlation coefficients of all the determined elements were as follows: Pb:y=31.016 3x+0.009 3,r=0.999 8;Mn: y=4.409 9x-0.089 9,r=0.997 0;Cu: y=5.029 25x-0.051 20,r=0.998 9;Fe: y=8.110 6x-0.100 4,r=0.997 1.The contents of microelements was relatively high in H.cordata,among the 3 determined microelements,the content of Fe was highest and the content of harmful element Pb was relatively low.The contents of Fe,Cu,Mn and Pb in H.cordata were lower than the limited amout indices of Chinese food hygienic standard and green improt and export standard of medicinal plant preparation,which were that the total content of heavy metals was no more than 20.0 mg/kg and the content of Pb was no more than 5.0 mg/kg.The RSDs of determining Pb,Cu,Mn and Fe by this method were 1.0%-3.0%,0.3%-0.4%,0.3%-0.4% and 0.3%-0.4% resp.[Conclusion] The content determination of microelements and heavy metal in H.cordata by flame atomic absorption spectrometry had higher sensitivity and accuracy.