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在调查黄石沿江冲积土壤的基础上,进行了作物中镉调查。通过混酸(HNO3+HClO4)湿法消解,利用全谱直读等离子体原子发射光谱仪(ICP-AES)对几种常见经济作物和蔬菜镉(Cd)的含量进行了测定,采用Excel2003和SPSS16.0对数据进行了处理和分析,并按食品卫生标准和USEPA(美国环境保护署)推荐的人类最大允许摄入RfD(Reference dose)Cd值1μg/kg·d对其进行了安全评价。结果表明:研究区内蔬菜及粮食作物Cd含量一般为根、茎部分大于可食部分;蔬菜可食部分的Cd含量大于粮食经济作物中的含量,可食部分Cd含量最高值出现在茄子中,为1.215mg/kg(干重),其次为空心菜和辣椒,分别为1.099mg/kg、0.558mg/kg,而花生、玉米、黄豆等经济作物的Cd含量在株体不同部位中都比较低;Cd在作物体内的迁移能力为根部-茎部>茎部-可食部分;研究区内以空心菜为代表的叶菜类和以辣椒、茄子为代表的茄果类蔬菜部分已受到Cd的轻微污染。
Based on the investigation of alluvial soil along Huangshi River, cadmium in crops was investigated. The content of cadmium (Cd) in several common cash crops and vegetables was determined by wet digestion with mixed acid (HNO3 + HClO4) and full-spectrum direct reading plasma atomic emission spectrometry (ICP-AES) The data were processed and analyzed and safety evaluated according to food hygiene standards and the recommended maximum human exposure RfD (Reference dose) 1 μg / kg · d as recommended by the USEPA (U.S. Environmental Protection Agency). The results showed that the Cd content of vegetables and grain crops in the study area was generally higher than that of the edible parts in the roots and stems; the Cd content of the edible parts of the vegetables was greater than that of the cash crops, and the highest value of the edible parts appeared in the eggplant, And 1.258 mg / kg respectively. The Cd content in cash crops such as peanut, corn and soybean was lower in different parts of the plant body. Cd in the body of the migration capacity of the root - stem> stem - edible part of the study area to the representative of the water spinach cabbage and pepper, eggplant, part of the solanum vegetables have been slightly contaminated by Cd .