Distribution and accumulation characteristics of heavy metals in different organs of Mentha haplocalyx in Guizhou.

[Objective] The aim is to study distribution and accumulation characteristics of five heavy metals(Pb,Cd,Hg,As and Cu) in different organs of Mentha haplocalyx and discuss factors that affecting heavy metals in the herb,which will provide some valuable information for selection certain organs of Mentha haplocalyx for medical uses.[Method] Atomic absorption spectrometer and atomic fluorescence spectrometer were adopted to determine the concentrations of heavy metals.[Results] Concentrations of As,Hg and Pb in the plant organs showed the following order:leafrootstem,the order of concentration for Cu was:rootleafstem,while the order of the concentration for Cd was:rootstemleaf.The concentrations of heavy metals displayed some obvious differences in Mentha haplocalyx leaves(r=-0.952,P0.05).The concentrations of Pb and Cu in soils of GAP base showed a negative correlation(r=-0.954,P0.05).As and Cu in these GAP soils also exhibited a strong negative correlation(r=-0.990,P0.05),while As and Pb in the soil demonstrated a strong positive correlation(r=0.987,P0.05).[Conclusion] The concentrations of heavy metals displayed some abvious differences in different organs of Mentha haplocalyx while there were no significant correlations between the concentrations of heavy metals in the GAP soil and those in the organs of Mentha haplocalyx.