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- 저자 : ( Naoki Sekiya ) (검색결과 1 건)
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Abstract : Soil washing for rice paddy soils contaminated with cadmium
( Tomoyuki Makinoa ),( Takashi Kamiya ),( Naoki Sekiya ),( Yuji Maejima ),( Ikuko Akahane ),( Hiroyuki Takano ) 한국환경농학회 2012 한국환경농학회 워크샵자료 Vol.2012 No.2
Codex Alimentarius Commission (Codex) has adopted the maximum permissible concentration of cadmium (Cd) in polished rice and other relevant crops, which requires an alleviation of the Cd contamination in rice grain. Various chemicals were tested for their Cd extraction efficiency by using three paddy soils, selecting ferric chloride (FeCl3) as a promising chemical for on-site soil washing. The comparison of FeCl3 extraction ability to that of various iron, manganese, and zinc salts revealed the primary extraction mechanism of FeCl3 to be proton release coupled with hydroxide generation (hydrolysis). This indicates that proton release from FeCl3 is controlled by the chemical equilibrium of hydroxide formation, and minimizes the negative effect on soil properties and environment, which are different from hydrochloric acid (HCl). Washing with FeCl3 led to the formation of Cd?chloride complexes, enhancing Cd extraction from the soils. We also developed in situ three-step washing method for Cd-contaminated paddy fields with FeCl3. The method was comprised of 1) chemically washing the field soil with a FeCl3 solution; 2) washing the treated soil with water to eliminate residual Cd and FeCl3; and 3) on-site treatment of wastewater using a portable wastewater treatment system. Concentrations of Cd in the treated water were below Japan`s environmental quality standard (0.01 mg L-1). The on-site soil washing confirmed the effectiveness of FeCl3 for decreasing Cd in soil and rice grains without negative effect on rice yield.
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