Zhu Liang-Liang, Wang Fu-Peng, Tang Le-Bin, Xiao Nai-Chuan, Dong Xin-Yue, Wei Mei-Liu, Song Bo
College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004, China.
Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Area, Guilin 541004, China.
Huan Jing Ke Xue. 2022 Aug 8;43(8):4219-4231. doi: 10.13227/j.hjkx.202111201.
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.
为探究广西柳州市典型区域地源镉异常区稻田土壤重金属迁移转化特征并评估水稻安全种植情况，采集了该区域稻田91对土壤和水稻样品，测定了Cd等重金属含量、土壤pH值及有机质含量。结果表明：①稻田中Cd、Cu、Ni、Zn超标率分别为92.31%、34.07%、36.26%、90.11%。与《土壤环境质量农用地土壤污染风险管控标准》筛选值相比，Cd和Zn超标率分别为30.53%和25.26%。超标点位主要分布在福事镇。②大良镇Cd和Ni超标率分别为35.16%和3.30%，Cd富集系数和超标率最高。③相关性分析表明，土壤pH值是影响水稻重金属含量的主要因素，水稻中Cd和Ni污染源相似。④水稻健康风险评估结果显示，大良镇水稻Cd的THQ值大于1.0，表明该区域水稻Cd存在潜在健康风险。TTHQ值均大于1.0，表明儿童风险高于成年女性，成年女性高于成年男性，说明合理饮食结构对不同年龄和性别人群预防重金属摄入至关重要。因此，柳州市地源镉异常区水稻种植存在一定风险，需采取不同安全利用措施加以管控。
