CADMIUM CONTAMINATION OF SOILS AND RICE PLANTS CAUSED BY ZINC MINING : V. Removal of Soil Cadmium by an HCl-leaching Method for the Control of High Cd Rice
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概要
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A method of leaching polluted soil with diluted HCl solution was investigated for controlling high Cd in rice. Results obtained in the pot and field experiments are summarized as follows : 1. By leaching the soil in the pot with 0.05 or 0.1N HCl solution followed by washing with water, soluble heavy metals were remarkably removed in the order of Cd>Cu>Zn>>Pb ; the Cd content decreased to half with 0.1N HCl treatment. 2. Heavy metal contents of the plants decreased with the treatments. Especially, Cd content in straw and rice of the soil applied with CaCO_3 after the treatment was one-third and one-fifteenth of the control, respectively. 3. A contaminated paddy field was similarly treated using industrial conc. HCl. One-fourth of the soluble Cd in the surface soil was removed by this method, and the Cd content of the unpolished rice decreased from 0.33ppm to 0.06ppm in the plot treated with fused magnesium phosphate and calcium silicate after the treatment. 4. Cd concentration of the drained water from the treated field could soon be diluted far below the allowable limit with the abundant river current. A sufficient supply of calcareous materials was needed to compensate for the lost bases in the soil.
- 社団法人日本土壌肥料学会の論文
著者
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TAKIJIMA Yasuo
International Agricultural Training Centre, OTCA
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KATSUMI Futoshi
Fukui Agricultural Experiment Station
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KOIZUMI Satoshi
Fukui Agricultural Experiment Station
関連論文
- CADMIUM CONTAMINATION OF SOILS AND RICE PLANTS CAUSED BY ZINC MINING : V. Removal of Soil Cadmium by an HCl-leaching Method for the Control of High Cd Rice
- CADMIUM CONTAMINATION OF SOILS AND RICE PLANTS CAUSED BY ZINC MINING : III. Effects of Water Management and Applied Organic Manures on the Control of Cd Uptake by Plants
- CADMIUM CONTAMINATION OF SOILS AND RICE PLANTS CAUSED BY ZINC MINING : I. Production of High Cadmium Rice on the Paddy Fields in Lower Reaches of the Mine Station
- CADMIUM CONTAMINATION OF SOILS AND RICE PLANTS CAUSED BY ZINC MINING : II. Soil Conditions of Contaminated Paddy Fields Which Influence Heavy Metal Contents in Rice
- CADMIUM CONTAMINATION OF SOILS AND RICE PLANTS CAUSED BY ZINC MINING : IV. Use of Soil Amendment Materials for the Control of Cd Uptake by Plants