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| Pollution evaluation and dietary exposure risk assessmentof heavy metals in rice from a lead-zinc ore mine |
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| Abstract: |
| 90 rice samples were collected from a Lead-zinc mine located in Guangdong province，the
contents of cadmium（ Cd），chromium（ Cr），lead（ Pb），arsenic（ As）and zinc（ Zn）in rice were analyzed.
The pollution situation was evaluated by single factor pollution index and N. L. Nemerow comprehensive pollution
index，and the intake healthy risk of heavy metals from rice ingestion was assessed by a multimedia exposure
assessment model（ the MMSOILS model）promoted by USEPA. The average concentrations of Cd，Cr，Pb，As
and Zn in rice were 0.4098，0.4727，0.1746，0.0401，15.8100 mg/kg，respectively. Only the levels of Cd and Pb
exceeded the standard，and the over standard rates were 83.33% and 31.11%，respectively. The average single
factor pollution index of Cd，Cr，Pb，As were 2.0490，0.4727，0.8732 and 0.2006，respectively，suggesting
the rice were polluted by Cd in some extent. Comprehensive pollution index indicated that 17.78% of the rice
samples were uncontaminated，45.56% were slightly polluted，24.44% were moderate polluted，and 12.22% were
heavily polluted. Among the study elements，only the
daily intake dose of Cd and Cr exceeded the USEPA
reference standard dose（ RfD），with hazard quotients
（HQ）of 2.740 and 1.0533，respectively，indicating
the local residents were experiencing certain Cd and
Cr exposure risk from rice ingestion |
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