カドミウム汚染米投与による動物体内へのカドミウムの蓄積

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Polluted brown rice containing 0.6ppm of cadmium which is under the limit of the safety standard (1.0ppm for brown rice and 0.9ppm for polished rice), was investigated for the effects on animal organs. The above standards have been set by the Ministry of Health and Welfare, Japan.87 mice were divided into four groups with diets as follows:Group 1. unpolluted brown rice (0.1ppm cadmium) and low calcium content.Group 2. unpolluted brown rice with high calcium content.Group 3. polluted brown rice (0.6ppm) and low calcium content.Group 4. polluted brown rice with high calcium content.After 75 weeks on these dietary regimens the animals were sacrificed and livers and kidneys were determined for cadmium content. The atomic absorption method was employed.Results: Average content of cadmium in kidneys of the respective groups was: 3.46, 1.14, 10.40, 6.90ppm (dry matter). In the livers 0.72, 0.17, 2.27, 1.50ppm.It was thus demonstrated that cadmium content in animal organs increased remarkably on a polluted rice diet especially in the food with low calcium content. Cadmium accumulated considerably in mice that lived throughout the entire experimental period.
日本衛生学会の論文