浙江某垃圾焚烧厂周边土壤中稀土元素分布特征及潜在生态风险评价  

Spatial distribution and potential ecological risk assessment of rare earth elements in soil surrounding a waste incineration plant in Zhejiang

作　　者：雷成琦 钟山 张漓杉 朱婧 韦锃弦[1,2] LEI Chengqi;ZHONG Shan;ZHANG Lishan;ZHU Jing;WEI Zengxian(Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection Ministry of Education,Guangxi Normal University,Guilin,541006,China;College of Environment and Resources,Guangxi Normal University,Guilin,541006,China;School of Life and Environmental Sciences,Guilin University of Electronic Technology,Guilin,541004,China)

机构地区：[1]珍稀濒危动植物生态与环境保护教育部重点实验室,桂林541006 [2]广西师范大学环境与资源学院,桂林541006 [3]桂林电子科技大学生命与环境科学学院,桂林541004

出　　处：《环境化学》2022年第5期1629-1638,共10页Environmental Chemistry

基　　金：国家自然科学基金(51108100,51568010)资助。

摘　　要：采用电感耦合等离子体质谱仪测定了浙江某垃圾焚烧厂周边表层土壤样品中镧、铈、镨、钕、钇等15种稀土元素的浓度.利用统计学方法分析稀土元素分布特征,并评价土壤稀土元素的潜在生态风险水平.结果表明,该垃圾焚烧厂周边表层土壤中稀土元素平均浓度范围为0.49—84.51 mg·kg^(-1),总稀土元素浓度范围为231.21—259.47 mg·kg^(-1),均高于土壤背景值,而焚烧厂尾气中的稀土元素浓度达到385.73 mg·kg^(-1).稀土元素的浓度增量分析结果表明,稀土元素的浓度增量趋势与风频分布趋势相似,浓度增量越大的区域其风频越大,两者的相关性系数达到0.928.潜在生态风险指数显示,该垃圾焚烧厂周边土壤中稀土元素的潜在生态风险评价指数值范围为16.67—17.21,风频较小的上风向区域和平行风向1区域处于低生态风险水平,风频较大的下风向区域和平行风向2区域处于中等生态风险水平.垃圾焚烧厂周边土壤中稀土元素累积很可能受到了焚烧厂尾气排放的影响,随着焚烧尾气的持续排放,后期生态风险可能还会增加.The concentrations of fifteen rare earth elements(La,Ce,Pr,Nd and Y,etc)in the surface soils surrounding a waste incineration plant in Zhejiang were determined using inductive coupled plasma spectrometer.The spatial distribution of the rare earth elements was studied by statistical methods,and their potential ecological risk was assessed.The results indicated that the rare earth elements were detected with mean concentrations ranging from 0.49 to 84.51 mg·kg^(-1).The total concentrations of the rare earth elements ranged from 231.21 to 259.47 mg·kg^(-1),which were higher than the local soil background values.It was found that the total concentrations of the rare earth elements in tail gas from the incineration stack reached 385.73 mg·kg^(-1).The analysis results showed that the area with the highest increment concentration of rare earth elements coincided with the highest wind frequency direction.The correlation coefficient between them reached 0.928.The potential ecological risk index values of the rare earth elements ranged from 16.67 to 17.21.The upwind area and parallel wind direction 1 area with low wind direction frequency were at low ecological risk level.In contrast,the downwind area and parallel wind direction 2 area with higher wind direction frequency were at medium ecological risk level.The accumulation of the rare earth elements in soil surrounding the waste incineration plant was likely to be affected by the tail gas exhausted from the waste incineration plant.The ecological risk may increase in the future as the continuous operation of waste incineration plant.

关 键 词：垃圾焚烧厂 土壤 稀土元素 潜在生态风险评价 

分 类 号：X53[环境科学与工程—环境工程] X826