Muramoto S
Research Institute for Bioresources, Okayama University, Kurashiki, Japan.
J Environ Sci Health B. 1989 Oct;24(5):559-68. doi: 10.1080/03601238909372667.
The toxicity of metal oxides (CdO, ZnO, PbO) were compared with each other and the critical levels of metal uptake by rice plants were determined. The order of metal toxicity to rice plants is CdO greater than ZnO greater than PbO. The highest concentration obtained for unpolished rice was 4.97 micrograms/g at the Cd 10,000 ppm in soil. This values is higher than every other we have seen in the reports for treatment with CdO. We are able to find out that the concentration of 10,000 ppm Cd in the form of CdO in the critical one towards rice plant. By contrast, such damage was not observed at even higher levels of ZnO and PbO were considered to have low toxicity toward rice plant. Also, a negative correlation between Zn or Cu accumulation in rice plants and Cd concentration in soil was found.
比较了金属氧化物（氧化镉、氧化锌、氧化铅）的毒性，并确定了水稻植株吸收金属的临界水平。金属对水稻植株的毒性顺序为氧化镉大于氧化锌大于氧化铅。在土壤中镉含量为10000 ppm时，糙米的最高浓度为4.97微克/克。该值高于我们在氧化镉处理报告中看到的其他所有值。我们能够发现，土壤中以氧化镉形式存在的10000 ppm镉浓度对水稻植株至关重要。相比之下，即使在更高水平的氧化锌和氧化铅处理下也未观察到此类损害，因此认为它们对水稻植株毒性较低。此外，还发现水稻植株中锌或铜的积累与土壤中镉浓度之间存在负相关。
