Analysis and Health Risk Assessment of Heavy Metal in Houttuynia Cordata Thunberg
In this study,the contents of lead(Pb),chromium(Cr),cadmium(Cd)and arsenic(As)in Houttuynia cordata Thunberg(HCT)sold in Zunyi City and wild HCT in surrounding towns were determined by inductively coupled plasma-mass spectrometry(ICP-MS)using the microwave digestion method in the national food safety standard determination of multi elements in food(GB 5009.268-2016).The distri-bution differences of heavy metals in different parts(roots and underground stems)of HCT and wild HCT were compared and analyzed,and the health risks of residents ingesting Pb,Cr,Cd and As by eating Houttuynia cordata Thunb were preliminarily evaluated by using Nemero compre-hensive pollution index method,single factor pollution index method and target risk coefficient.The results showed that Pb,Cr,Cd and As in the collected samples of HCT and wild HCT exceeded the standard in varying degrees.The contents of Pb,Cr,Cd and As in commercial HCT were significantly higher than those in underground stems,which were 9.7 times,5.3 times,19.9 times and 9.0 times respectively.The roots and underground stems of HCT on the market are seriously polluted and slightly polluted respectively(P-complex is 20.8 and 1.1 respective-ly),while the roots and underground stems of wild HCT are seriously polluted by heavy metals(P-complex is 92.5 and 5.9 respectively).The target hazard coefficient(THQ)of a single heavy metal in both commercial and wild HCT was Cr＞Cd＞Pb＞As.The TTHQ of underground stems of commercial HCT was less than 1,indicating that there was no obvious health risk,but the TTHQ in the underground stems of wild HCT was 1.139,indicating obvious health risk.Due to the high content of heavy metals in the roots of HCT,it was recommended to remove the roots when eating HCT so as to reduce the health risk to residents.
Houttuynia Cordata ThunbergHeavy MetalsHealth RisksZunyi City
国家科技期刊平台
NSTL
万方数据
