| In this research, a series of methods based on geo-accumulation index, bio-concentration factors, trans-loca⁃
tion factor, and target hazard quotients were utilized to analyze and evaluate the heavy metal contents including Cu, Cr, Pb,
Cd, as well as the characteristics of translocated accumulation from soil-Li medicine system. The results showed that the
natural forests were free from Cd pollution, whereas soils of vegetable field, botanical garden, rubber plantation of Li medi⁃
cine samples were all polluted by Cr, Cu, and Cd with various degrees. In addition to the fact that Fructus Amomi Longiligu⁃
laris with its roots used as medicine and Alpiniae Katsumadai Semen with its leaves used as medicine were slightly polluted
by Pb, medical part of the stem and leaf of Hongkong Pavetta, Sharpleaf Galangal Fruit, Whitefruit Amomim Fruit, Fructus
Amomi Longiligularis were all free from heavy metal pollution. The enrichment capacity of 6 kinds of Li medicines on
heavy metals was different, which was stronger for Cd and Cu, weak for Cr, and weakest for Pb. The heavy metals Cd and Pb presented extremely strong ability to translocate between stem and leaf of Li medicine, while Cr presented strong ability to
translocate between stem and leaf, and Cu presented relatively moderate translocation ability from root to stem to leaf. The
residual Cd, Cr, Cu, Pb in medical parts of six kinds of Li medicine did not pose an edible risk to the exposed population. |
