| 柳州地源性镉异常区稻米重金属积累效应与健康风险 |
| 摘要点击 4568 全文点击 457 投稿时间：2021-11-18 修订日期：2021-12-28 |
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| 中文关键词 柳州 地源性 镉异常区 稻米 健康风险 |
| 英文关键词 Liuzhou ground source cadmium anomaly area rice health risks |
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| 中文摘要 |
| 为探讨地源性镉异常区土壤重金属在稻米中迁移转化特征，并评估水稻安全种植性，以广西柳州市典型地区水田为研究对象，共采集土壤与稻米成对样品91组，测试Cd等重金属、土壤pH和有机质含量.结果表明：①与背景值相比，水田土壤Cd、Cu、Ni和Zn分别超背景值92.31%、34.07%、36.26%和90.11%；与相关标准中的筛选值相比，Cd和Zn含量的点位超标率为30.53%和25.26%，超标点位主要分布于浮石镇；②稻米Cd和Ni含量的点位超标率分别为35.16%和3.30%，其中大良镇稻米Cd富集系数最高且稻米Cd超标率最高；③相关性分析显示，土壤pH是稻米重金属的主要影响因子，且稻米Cd和Ni具有相似来源；④稻米健康风险评价结果显示，大良镇稻米Cd的THQ值大于1.0，说明该地区稻米Cd存在潜在健康风险.所有乡镇TTHQ值均大于1.0，且显示出儿童高于成年女性，成年女性高于成年男性，表明合理的膳食结构对于预防不同年龄和性别的重金属摄入至关重要.因此，柳州地源性镉异常区水稻种植存在一定的风险，需要针对性采用不同的安全利用措施加以管控. |
| 英文摘要 |
| In order to explore the migration and transformation characteristics of soil heavy metals in rice in an area of ground source cadmium anomaly and to evaluate the safe planting of rice, a total of 91 pairs of soil and rice samples were collected from paddy fields in the typical area of Liuzhou city, Guangxi province, and the contents of heavy metals such as Cd, soil pH, and organic matter were tested. The results showed that:① Cd, Cu, Ni, and Zn in the paddy field exceeded the background values of 92.31%, 34.07%, 36.26%, and 90.11%, respectively. Compared with the screening values in the Soil Environmental Quality Agricultural Land Soil Pollution Risk Control Standard, Cd and Zn exceeded 30.53% and 25.26%, respectively. Super standard points were mainly distributed in Fushi Town. ② Cd and Ni exceeded 35.16% and 3.30%, respectively, and Daliang town had the highest Cd enrichment coefficient and Cd exceeded rate. ③ Correlation analysis showed that soil pH was the main influencing factor of heavy metals in rice, and Cd and Ni had similar pollution sources in rice. ④ The results of rice health risk assessment showed that the THQ value of rice Cd in Daliang town was greater than 1.0, indicating the potential health risk of rice Cd in this area. The TTHQ values were all greater than 1.0, indicating that the risks to children were higher than those to adult women, which were higher than those of adult men, showing that reasonable dietary structure is crucial to prevent heavy metal intake in different ages and genders. Therefore, there are certain risks in rice planting in the Liuzhou area of ground source cadmium anomaly, which need to be controlled using different safety utilization measures. |
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