| 典型电子垃圾拆解厂周围农田土壤稀土元素污染特征 |
| Characteristics of Rare Earth Elements Contamination in Farmland Soil Around Typical Electronic Dismantling Factory |
| 投稿时间：2024-07-01 修订日期：2025-02-28 |
| DOI：10.19316/j.issn.1002-6002.2026.01.22 |
| 中文关键词: 电子垃圾拆解厂 农田土壤 稀土元素 污染评价 |
| 英文关键词:electronic dismantling factory farmland soil rare earth elements pollution assessment |
| 基金项目:河南省科技攻关计划(222102110359);河南省自然科学基金(232300420163);河南省教育重点项目(23A610013,23A170005) |
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| 中文摘要: |
| 为调查电子垃圾拆解厂可能对周围农田土壤稀土元素(REEs)含量造成的影响,以区域典型电子垃圾拆解厂周围农田土壤为研究对象,分析了土壤中镧(La)、铈(Ce)、镨(Pr)、钕(Nd)、镱(Yb)、铕(Eu)、钐(Sm)等14种REEs的含量。结果表明,该电子垃圾拆解厂周围农田土壤中REEs的总浓度范围为162.34~384.94 mg/kg,平均值为259.03 mg/kg,高于中国及河南省土壤环境背景值(186.8 mg/kg和154.6 mg/kg)。空间分析显示,土壤中REEs的含量从东南方向往西北方向呈减少趋势。此外,通过REEs特征指数分析发现,Eu和Ce两种元素中,δ(Eu)平均值为0.84(负异常),δ(Ce)平均值为1.22(正异常),表明两种元素分别表现为弱亏损和弱富集状态。(La/Yb)N和(La/Sm)N的平均值分别为13.50和4.53,表明研究区域土壤中REEs的分异和分馏程度相对较高。利用地累积指数(Igeo)、内梅罗综合污染指数(PN)和污染负荷指数(PLI)对电子垃圾拆解厂周边农田土壤中REEs的污染程度进行综合评估,结果显示,土壤中REEs的Igeo值均低于2,且PN和PLI平均值均介于1~2之间,表明研究区REEs含量普遍处于轻度污染水平。 |
| 英文摘要: |
| To investigate the potential impact of electronic waste dismantling plants on the content of rare earth elements (REEs) in surrounding farmland soils,taking the farmland soil around a typical regional electronic waste dismantling plant as the research object,the concentrations of 14 REEs (including lanthanum,cerium,praseodymium,neodymium,ytterbium,europium,samarium,etc.) in the soil were analyzed in this study.The results show that the total REEs concentration in the surrounding farmland soils ranged from 162.34 to 384.94 mg/kg,with an average of 259.03 mg/kg,which exceeds the soil environmental background values of China (186.8 mg/kg) and Henan Province (154.6 mg/kg).Spatial analysis shows a decreasing trend of REEs from the southeast to the northwest.In addition,analysis using REEs characteristic indices reveals that the average δ(Eu) is 0.84 (negative anomaly),while the average δ(Ce) is 1.22 (positive anomaly),indicating a state of weak deficit of Eu and weak enrichment of Ce.The average values of (La/Yb)N and (La/Sm)N are 13.50 and 4.53,respectively,indicating a relatively large differentiation and fractionation of REEs in the study area.The geo-accumulation risk (Igeo),Nemerow pollution index (PN) and pollution load index (PLI) were used to comprehensively evaluate the REEs pollution in the farmland soils around the electronic waste dismantling plant.The results show that the Igeo values of REEs in the soil are all lower than 2,and the average values of PN and PLI are between 1 and 2,indicating that REEs are generally in a mild pollution level. |
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