华东某铀矿区稻米中Cr元素含量及其空间分布特征研究

利用等离子体质谱仪测定了某铀矿区周边稻米中重金属元素Cr的含量,重点对铀矿区稻米中的Cr元素含量及其空间分布特征进行了研究.结果表明,铀矿区内67.80％的稻米样品Cr含量超过国家标准（GB 2762-2005）;已经对环境造成了危害.铀矿区内稻米中Cr含量变化范围是0.37 ～ 13.20 mg/kg,平均含量为2.08 mg/kg.道路沿线区域、尾矿堆积区、水冶厂和矿床开采区下游及周边区域内稻米中Cr元素含量明显高于上游地区或远离上述区域的其他地区.矿床开采产生的废水与废渣、水冶厂的废液渗漏、尾矿露天堆积以及矿石运输过程中的矿渣洒落等原因可能是导致Cr元素随地表径流发生迁移进入稻田,从而使矿区稻米中Cr的含量较高的重要因素.

Study on the Cr Contents and Spatial Characteristics of Rice in the Area of a Uranium Mine,East China

In this paper, Cr contents in rice were measured and compared by means of ICP-MS. All rice samples were collected from a urani- um deposit area located in East China. The husk of paddies was removed and grinded into flour. The results show that ： In the uranium deposit area, for the Cr contents, 67.80 percent of rice samples are over the normal value （ GB 2762 - 2005 ）. The average Cr contents of rice sam- ples is 2.08 mg/kg in the uranium deposit area, range from 0.37 mg/kg to 13.20 mg/kg. Forty rice samples, with the Cr contents above the normal value, are all planted and collected along the road, near to the area of Tailings stack, Uranium Hydrometallurgy Plant or in the down- stream area of the uranium deposit mining. The other rice samples, with the Cr contents below the normal value, are planted and collected from other regions which are far away afore mentioned areas. The waste water and slag generated by depositmining, waste water leaked from the Uranium Hydrometallurgy Plant, waste from open-air tailings stack and dashed from ore trucks, migrated and transferred into the paddy fields by rainfall, maybe the most important factors which resulted in the rice concentrated much more Cr element.