洞庭湖区土壤、稻米的镉问题及其治理

镉是1984年联合国环境规划署提出的具有全球意义的12种危害物质之一。已披露的资料表明,稻田土壤中镉含量大于0.87mg/kg,稻米中镉含量大于1.13mg/kg,长期通过食物链可导致人出现镉中毒病症。洞庭湖区浅层土壤中镉含量均值为0.36mg/kg,深层土壤中均值为0.14mg/kg;稻米中镉含量早稻均值为0.06mg/kg,晚稻均值为0.16mg/kg。洞庭湖区农田按现镉水平及种植的现水稻品种来看,稻米食品是安全的。但是如果稻田土壤镉还在累积,又种植富集镉强势的超级杂交稻,那么难免有一天会出现稻米食品不安全,因此不使现在水稻土壤有镉的累积最为关键。

Soil and Rice Cadmium Problems in the Dongting Lake Area and Solutions

Cadmium is one of 12 universal dangerous matters determined by UNEP in 1984.The existing data show that if cadmium is above 0.87mg/kg in rice soil and 1.13mg/kg in rice,people will suffer cadmium poisoning diseases if they eat rice for a long time.In the Dongting Lake area,cadmium is 0.36mg/kg in shallow soil and 0.14mg/kg in deep soil;cadmium is 0.06mg/kg in early rice and 0.16mg/kg in late rice.Therefore,rice in the Dongting Lake area is safe now.However,if cadmium in soil continues to accumulate and people plant super hybrid rice which accumulates cadmium greatly,rice may be unsafe in the future.So now it is critical to prevent cadmium from accumulating in soil.