Liming effects on cadmium stabilization in upland soil affected by gold mining activity

Chang Oh Hong, Do Kyoung Lee, Doug Young Chung, Pil Joo Kim

Research output: Contribution to journalArticlepeer-review

Abstract

To reduce cadmium (Cd) uptake of plants cultivated in heavy metal-contaminated soil, the best liming material was selected in the incubation test. The effect of the selected material was evaluated in the field. In the incubation experimentation, CaCO3, Ca(OH)2, CaSO 4·2H2O, and oyster shell meal were mixed with soil at rates corresponding to 0, 400, 800, 1600, 3200 mg Ca kg-1. The limed soil was moistened to 70% of field moisture capacity, and incubated at 25°C for 4 weeks. Ca(OH)2 was found to be more efficient on reducing soil NH4OAc extractable Cd concentration, due to pH increase induced net negative charge. The selected Ca(OH)2 was applied at rates 0, 2, 4, 8 Mg ha-1 and then cultivated radish (Raphanus sativa L.) in the field. NH4OAc extractable Cd concentration of soil and plant Cd concentration decreased significantly with increasing Ca(OH) 2 rate, since alkaline-liming material markedly increased net negative charge of soil induced by pH increase, and decreased bioavailable Cd fractions (exchangeable + acidic and reducible Cd fraction) during radish cultivation. Cadmium uptake of radish could be reduced by about 50% by amending with about 5 Mg ha-1 Ca(OH)2 without adverse effect on radish yield and growth. The increase of net negative charge of soil by Ca(OH)2 application may suppress Cd uptake and the competition between Ca2+ and Cd2+ may additionally affect the suppression of Cd uptake.

Original languageEnglish (US)
Pages (from-to)496-502
Number of pages7
JournalArchives of Environmental Contamination and Toxicology
Volume52
Issue number4
DOIs
StatePublished - May 2007
Externally publishedYes

ASJC Scopus subject areas

  • Toxicology
  • Pollution
  • Health, Toxicology and Mutagenesis

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