成都平原典型Cd污染区稻米Cd、Zn含量特征及其健康风险探讨
发布时间：2019-08-03 10:35
【摘要】：在成都平原选取了2个镉污染程度不同的区域,测定了污染区内稻米样本中的Cd、Zn质量分数,分析了这些元素含量随污染程度的变化,探讨了农民就地消费稻米的安全性。结果表明,中度(Ⅲ类土)、重度(超Ⅲ类土)Cd污染区稻米Cd质量分数超标严重,超标率分别达75%和100%,而且重度污染区稻米中的Cd含量是中度污染区的近5倍,但Zn含量差异很小,表明随着土壤Cd含量的增加,会加剧稻米Cd累积和Zn的相对缺乏,从而进一步降低食品的安全性;中度Cd污染区65%、重度Cd污染区92%的稻米样品Cd/Zn比值超过了食物Cd/Zn的健康临界值0.015。分别参照WHO和USEPA推荐的成人RFD(Cd)值和当地居民习惯食物消费结构,分析表明对于农民就地消费稻米来说均存在较大程度的潜在Cd暴露风险,特别是重度污染区。因此,对于成都平原Cd污染区,研究相应的控制Cd污染技术并采取适宜的膳食结构做调节,来确保每日饮食中Cd的安全含量显得尤为迫切。
[Abstract]:Two areas with different cadmium pollution degree were selected in Chengdu plain to determine the Cd,Zn content in rice samples in the polluted area, and the changes of these elements with the pollution degree were analyzed, and the safety of farmers consuming rice in situ was discussed. The results showed that the Cd content of rice in moderate (class III soil) and severe (super class III soil) Cd contaminated areas exceeded the standard seriously, the exceeding standard rate was 75% and 100%, respectively, and the content of Cd in rice in severe polluted area was nearly 5 times higher than that in moderately polluted area, but the difference of Zn content was very small, which indicated that with the increase of soil Cd content, the accumulation of Cd and the relative shortage of Zn in rice would be aggravated, thus further reducing the safety of food. The Cd/Zn ratio of rice samples in moderate Cd contaminated area and 92% rice sample in severe Cd contaminated area exceeded the health critical value of food Cd/Zn 0.015. Referring to the adult RFD (Cd) value recommended by WHO and USEPA and the structure of local residents' customary food consumption, the analysis showed that there was a great potential risk of Cd exposure for farmers to consume rice in situ, especially in heavily polluted areas. Therefore, it is particularly urgent to study the corresponding Cd pollution control technology and adopt the appropriate dietary structure to ensure the safe content of Cd in the daily diet for the Cd pollution area of Chengdu Plain.
【作者单位】： 西南科技大学环境与资源学院;四川省地质调查院;
【基金】：中国地质调查局项目(1212010511202) 四川省国土资源厅科技项目(KJ-2012-3);四川省国土资源厅地勘基金项目(201402) 国家自然科学基金项目(41472310)
【分类号】：X56;X82
[Abstract]:Two areas with different cadmium pollution degree were selected in Chengdu plain to determine the Cd,Zn content in rice samples in the polluted area, and the changes of these elements with the pollution degree were analyzed, and the safety of farmers consuming rice in situ was discussed. The results showed that the Cd content of rice in moderate (class III soil) and severe (super class III soil) Cd contaminated areas exceeded the standard seriously, the exceeding standard rate was 75% and 100%, respectively, and the content of Cd in rice in severe polluted area was nearly 5 times higher than that in moderately polluted area, but the difference of Zn content was very small, which indicated that with the increase of soil Cd content, the accumulation of Cd and the relative shortage of Zn in rice would be aggravated, thus further reducing the safety of food. The Cd/Zn ratio of rice samples in moderate Cd contaminated area and 92% rice sample in severe Cd contaminated area exceeded the health critical value of food Cd/Zn 0.015. Referring to the adult RFD (Cd) value recommended by WHO and USEPA and the structure of local residents' customary food consumption, the analysis showed that there was a great potential risk of Cd exposure for farmers to consume rice in situ, especially in heavily polluted areas. Therefore, it is particularly urgent to study the corresponding Cd pollution control technology and adopt the appropriate dietary structure to ensure the safe content of Cd in the daily diet for the Cd pollution area of Chengdu Plain.
【作者单位】： 西南科技大学环境与资源学院;四川省地质调查院;
【基金】：中国地质调查局项目(1212010511202) 四川省国土资源厅科技项目(KJ-2012-3);四川省国土资源厅地勘基金项目(201402) 国家自然科学基金项目(41472310)
【分类号】：X56;X82
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