Lead in paddy soils and rice plants and its potential health risk around Lechang Lead/Zinc Mine, Guangdong, China

Q. W. Yang, W. S. Shu, Jianwen QIU, H. B. Wang, C. Y. Lan*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

118 Citations (Scopus)

Abstract

As part of a project on phytoextraction of lead (Pb) in paddy soils around a lead/zinc (Pb/Zn) Mine in Lechang of Guangdong Province, South China, the concentration distribution of Pb in paddy soil-rice system was investigated, and its potential health risk to animal/human was evaluated. Total and diethylenetetraminepentaacetic acid (DTPA)-extractable Pb in soils averaged 1486 and 268 μg/g, respectively. According to sequential extraction procedure, soil Pb occurred primarily in the residual, carbonate and exchangeable fractions (30.2%, 26.7% and 19.1%, respectively). Lead extracted by the gastric juice simulation test (GJST) was 1068 μg/g and accounted for 75.4% of the total concentration. Mean Pb concentrations of 419 μg/g in rice root, 69.1 μg/g in whole straw, 51.0 μg/g in part straw (without two leaves near above the root), 44.9 μg/g in stalk, 21.9 μg/g in hull, 13.2 μg/g in grain with hull and 4.67μg/g in grain without hull (namely, unpolished rice) were found. Lead concentrations in both soil and rice plant were far above the corresponding tolerable levels. Lead daily intakes by local residents were 2.6 mg for adults and 1.2 mg for children, which were much higher than the allowable level. Thus, Pb in this area might pose a potential health risk to the local population.

Original languageEnglish
Pages (from-to)883-889
Number of pages7
JournalEnvironmental International
Volume30
Issue number7
DOIs
Publication statusPublished - Sep 2004

Scopus Subject Areas

  • Environmental Science(all)

User-Defined Keywords

  • GJST
  • Health risk
  • Lead pollution
  • Mining activity
  • Oryza sativa L.

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