Remediation of cadmium-contaminated paddy soils by washing with ferric chloride (fecl3): Effect of soil washing on the cadmium concentration in soil solution and spinach

Ikuko Akahane, Tomoyuki Makino, Yuji Maejima, Takashi Kamiya, Hiroyuki Takano, Toshiyuki Ibaraki, Makoto Inahara

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

We evaluated the effects of soil washing with ferric chloride (FeCl3) on cadmium (Cd) concentrations in soil solutions and Cd absorption by two spinach cultivars in pot experiments. Soil samples were collected from washed and unwashed plots of rice paddy fields in Fukuoka and Toyama, Japan. Spinach pot cultivation was performed with the above mentioned soil under oxidative conditions. Before and after spinach cultivation, the Cd content in washed soils was always lower than that in unwashed soils. Soil washing with FeCl3 affected the exchangeable cations (i.e. calcium increased and magnesium decreased). The Cd concentration in the soil solution from washed plot was lower than that in the solution from the unwashed plot throughout the spinach growth period, which was attributedto the exchangeable Cd content in both soils, because the fraction equilibrated with the Cd concentration in the soil solution. The exchangeable cation composition was affected by soil washing, but no significant difference in spinach yield was observed between the washed and unwashed plots. The leaf Cd concentration in the two spinach cultivars was up to 70% lower in the washed soils. This study suggested that soil washing in rice paddy fields with FeCl3 was effective for controlling the Cd absorption risk of upland cropssuch as spinach. However, some risks remain to clear the CODEX standard (0.2 mg kg-1) in the Cd content of leaf such as spinach, which has a high Cd absorptive capacity.

Original languageEnglish
Pages (from-to)273-281
Number of pages9
JournalJapan Agricultural Research Quarterly
Volume47
Issue number3
DOIs
Publication statusPublished - 2013 Aug 20
Externally publishedYes

Keywords

  • Chemical washing
  • Heavy metal
  • Leaf vegetable
  • Pot experiment
  • Remediation technology

ASJC Scopus subject areas

  • Biotechnology
  • Ecology
  • Animal Science and Zoology
  • Agronomy and Crop Science

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